Replacing the stove tap on a VAZ 2107 with your own hands in your garage

VAZ 2107 heater valve injector: heater modification

In our country, driving a car with a faulty heater in winter is strictly not recommended. This rule is true for all cars, and the VAZ 2107 is no exception. The fact is that the heater of this car has never been reliable and has always caused car owners a lot of trouble. And the heater valve, which began to leak literally a year after buying the car, gained especially notoriety among owners of “Sevens”. Fortunately, you can replace this part yourself. Let's figure out how to do this.

PURPOSE AND PRINCIPLE OF OPERATION OF THE OVEN VALVE ON THE VAZ 2107

In short, the purpose of the stove tap is to give the driver the opportunity to switch between “summer” and “winter” modes of heating the interior. To understand what we are talking about, you need to understand how the heating system of the “seven” works.

The fuel taps on all “sevens” without exception were membrane valves

So, the VAZ 2107 engine is cooled by antifreeze circulating in the so-called jacket. Antifreeze passes through the jacket, picks up heat from the engine and heats up to a boil. This boiling liquid must be cooled somehow. To do this, antifreeze is directed through a system of special pipes from the jacket to the main radiator, which is continuously blown by a massive fan.

The 7 engine cooling system has two radiators: the main one and the heating one.

Passing through the main radiator, the antifreeze cools and goes back into the engine for the next cooling cycle. The radiator (which in the early “sevens” was made exclusively of copper) becomes very hot after antifreeze passes through. And the fan, which continuously blows on this radiator, creates a powerful flow of hot air. In cold weather, this air is directed into the cabin.

In addition to the main radiator, the “seven” has a small heating radiator. It is on this that the heating tap is installed.

The heating valve on the “seven” is attached directly to the stove radiator

In winter, this tap is constantly open, so that hot antifreeze from the main radiator goes to the stove radiator, heating it too. The small radiator has its own small fan, which supplies heated air directly into the car’s interior through special air lines.

The heating system of the “seven” has its own fan and a complex system of air ducts

In summer there is no need to heat the interior, so the driver closes the heating tap. This makes it possible to use a heating fan without heating the interior (for example, for ventilation, or when the windows are fogged up). That is, a heating tap is necessary to quickly switch between small and large antifreeze circulation circles in the “seven” heating system.

Water pump failure

If the VAZ-2104 stove blows cold air when the faucet is open, one of the reasons may be a malfunction of the pump - the pump that circulates the coolant along the line.

Failure of this water pump may be due to the appearance of a leak, which will manifest itself not only in deterioration of interior heating, but also in an increase in temperature inside the engine due to a decrease in the total volume of antifreeze. Such a problem can only be detected by visual inspection - traces of coolant leakage will be visible in the area of ​​the pump.

The second reason for pump inoperability is jamming of the shaft bearing, but this is usually preceded by the appearance of a hum, so diagnosing the malfunction is much easier here.

Since the pump cannot be repaired (the statement looks controversial to many, but for most car owners it is true), the problem is “treated” by replacing the pump, which is done in the following order:

• drain the antifreeze. Not all of it - unscrew the plug on the power unit block. If you combine the procedure for replacing the pump with replacing the coolant, you will also need to unscrew the drain plug located on the main radiator;
• disconnect the battery terminals and remove the battery so as not to interfere;
• disconnect the block with the power wires of the electric fan, unscrew the three bolts holding the fan, remove it;
• loosen the nut that adjusts the tension of the generator belt, which will allow you to remove the belt;
• unscrew the nut that secures the bracket to the fan and move it to the side;
• unscrew the bolts holding the water pump pulley, holding it with a screwdriver;
• dismantle the pulley and begin to unscrew the four nuts holding the pump to the motor housing;
• after removing the pump, we clean the seat with emery cloth (if the old gasket is stuck);
• install a new gasket, having previously lubricated it with sealants, install a new pump;
• We perform all other operations in reverse order.

Before pouring antifreeze, make sure that the stove radiator tap control lever is in the “open” position. To prevent the formation of air locks, disconnect the intake manifold hose.

Stove fan

COMMON FUEL VALVE FAULTS

All malfunctions of the fuel valve on the VAZ 2107 are in one way or another related to a violation of the tightness of this device. Let's list them:

• The fuel valve started leaking. It’s impossible not to notice: a large puddle of antifreeze forms under the feet of the passenger sitting in the front seat, and a characteristic chemical smell spreads throughout the car’s interior. As a rule, a leak occurs due to the fact that the membrane in the fuel tap has become completely unusable. This is usually observed after two to three years of operation of the crane;
• The fuel valve is stuck. It's simple: the diaphragm fuel valve mentioned above is susceptible to oxidation and corrosion. Almost all drivers in our country close this tap in the warm season. That is, at least three months a year the tap remains in the closed position. And these three months are quite enough for the rotary rod in the faucet to oxidize and become firmly “stuck” to the body of the device. Sometimes it is possible to turn such a rod only with the help of pliers;
• antifreeze leaking from under the clamps. On some “sevens” (these are, as a rule, the latest models), the valve is attached to the pipes with steel clamps. These clamps weaken over time and begin to leak. And this is perhaps the most minor problem with the fuel tap that a car enthusiast may encounter. To solve it, simply tighten the leaking clamp with a flat screwdriver;
• The faucet does not open or close completely. The problem is due to internal contamination of the device. It is no secret that the quality of antifreeze on the domestic market of fuels and lubricants leaves much to be desired. In addition, counterfeit coolant is also found (as a rule, antifreeze from well-known brands is counterfeited). If the driver is used to saving on antifreeze, then gradually the fuel tap becomes clogged with dirt and various chemical impurities, which are present in abundance in low-quality antifreeze. These impurities form hard lumps that do not allow the driver to turn the valve stem all the way and completely close (or open) it. In addition, low-quality antifreeze can cause rapid corrosion of the internal parts of the standard "seven" diaphragm valve, and this can also prevent the fuel valve from being tightly closed. The solution to the problem is obvious: firstly, remove and thoroughly rinse the clogged tap, and secondly, use only high-quality coolant.

System management

In the VAZ-2104, the interior heating is controlled by the control panel handles, each of which ensures the closing and opening of one or another element.

Thus, the upper handle 9 ensures the opening and closing of the radiator valve 22. It regulates the amount of liquid that will enter the radiator.

The middle handle 10 opens and closes the air supply hatch 7, which regulates the amount of fresh air supplied from outside the car.

The lower handle 11 regulates the position of the damper 16, which distributes the air flow through the air ducts.

There is one feature of air flow distribution control. When the flap 16 is positioned to blow the windshield, the heated flaps of the side windows are completely blocked. Conversely, when the air flow is blocked by the flap on the windshield, the air is directed only to the side windows.

This phenomenon is due to the fact that the windshield damper lever is connected to the side air duct damper lever. Therefore, to simultaneously heat the windshield and side windows, the damper control handle must be placed in the middle position.

Heating of the VAZ-2104 is carried out in 4 ways:

• Heated windshield (Middle and lower control panel handles are moved to the right all the way);
• Heated side windows (the middle handle is moved to the right, and the bottom handle is moved to the left all the way);
• Heating of feet (upper handle – to the right all the way, air distribution cover of the heater housing is lowered down);
• Supply of hot air from outside through lowered windows (sounds like a joke, but this is indicated in the technical documentation for the car);

VARIETIES OF FUEL TAPS

Since the fuel tap on the VAZ 2107 is an extremely short-lived device, after two years of operation of the tap the driver will inevitably face the question of replacing it. However, fuel taps vary in both reliability and design. Therefore, it is worth understanding them in more detail.

MEMBRANE TYPE VALVE

A membrane-type valve was installed on all “sevens” that ever came off the assembly line. It is very easy to find this crane for sale: it is available in almost every spare parts store. This part is inexpensive - only 300 rubles or so.

The membrane heating valve on the “seven” has never been reliable

But the car owner should not be tempted by the low cost of a membrane tap, since it is very unreliable. And literally in two or three years the driver will again see coolant leaks in the cabin. Therefore, you should set the diaphragm fuel valve to “seven” only in one case: if the car enthusiast has not found anything more suitable.

FUEL BALL VALVE

A ball fuel valve is a more acceptable option for installation on a VAZ 2107. Due to its design features, a ball valve is much more reliable than a diaphragm valve. The shut-off element in ball valves is a steel sphere with a small through hole in the middle. This sphere is attached to a long rod. And this entire structure is built into a steel body, equipped with two pipe threads. To open the tap, it is enough to turn its stem 90°.

The main element of the ball valve is the steel locking sphere

With all the advantages, the ball valve has one significant drawback, which makes many drivers refuse to buy it. The sphere in the tap is steel. And although faucet manufacturers claim that these spheres are made only of stainless steel, practice shows that in aggressive antifreeze they very easily oxidize and rust. Especially during the long summer downtime, when the tap is not opened for several months. But if the driver is forced to choose between a diaphragm valve and a ball valve, then, of course, he should choose a ball valve. The price of ball valves today starts from 600 rubles.

TAP WITH CERAMIC ELEMENT

The most reasonable solution when replacing the fuel tap on a VAZ 2107 would be to purchase a ceramic tap. Externally, this device is practically no different from a ball and diaphragm valve. The only difference is in the design of the locking element. It consists of a pair of flat, tightly fitted ceramic plates placed in a special sleeve. This sleeve has a hole for the rod.

Ceramic tap - the best option for the VAZ 2107

When the rod turns, the distance between the plates increases, opening the way for antifreeze. The advantages of a ceramic faucet are obvious: it is reliable and not subject to corrosion. The only drawback of this device is the price, which can hardly be called affordable and starts at 900 rubles. Despite the high price, the driver is strongly recommended to purchase a ceramic faucet. This will allow you to forget about antifreeze leaking into the cabin for a long time.

WATER TAP

Some drivers, tired of constant problems with the standard “Seven” fuel tap, solve the problem radically. They go not to the auto parts store, but to the plumbing store. And they buy an ordinary water tap there. Usually this is a Chinese ball valve for pipes with a diameter of 15 mm.

Some drivers install regular water taps on the VAZ 2107

Such a faucet costs 200 rubles maximum. After this, the standard diaphragm valve from the “seven” is removed, a hose is passed into the niche where it stood, and a fuel valve is attached to the hose (it is usually secured with steel clamps, purchased at the same plumbing store). This design lasts a surprisingly long time, and in case of corrosion and jamming, the procedure for replacing such a tap takes only 15 minutes. But this solution also has a drawback: the water tap cannot be opened from the cabin. Every time the driver wants to use the heater, he will have to stop the car and climb under the hood.

Speaking about water taps, I can’t help but recall one story that I personally witnessed. A driver I know installed a Chinese crane under his hood. But he categorically did not want to jump out into the cold every time to open it. He solved the problem in the following way: he slightly expanded the niche in which the standard faucet had previously been located using ordinary metal scissors. He drilled a hole on the handle that opens the water tap. He inserted a hook made from an ordinary long knitting needle into this hole. He brought the other end of the spoke into the salon (under the glove compartment). Now, in order to open the tap, he just had to pull the knitting needle. Of course, such a “technical solution” cannot be called elegant. However, the man still solved the main task - not to climb under the hood every time.

Replacement instructions

Repair of the heater tap consists of replacing it. This is not a complicated procedure, so the repair can be done at home.

Tools and materials

To carry out the procedure, you need to prepare the tools and necessary materials:

• a set of keys;
• Phillips screwdriver;
• new tap;
• pliers;
• clamp with a diameter of about 23 mm;
• rubber gaskets;
• rags;
• sealant;
• container for draining working fluid;
• coolant.

New part for the stove
When deciding which is better, a ceramic faucet or a metal one, it is better to purchase a product with a ceramic locking mechanism. It meets all requirements for throughput and fastenings. In addition, it will last a long time, since ceramics are not subject to oxidation processes.

Stages

To make repairs more convenient, it is better to install the car on an inspection groove or drive it onto an overpass or lift.

For safety reasons, work should be performed with the engine cool.

Replacing the VAZ 2107 heater valve is carried out in stages:

1. Work begins with draining the coolant. To do this, first remove the crankcase protection.
2. Next, place the prepared container under the radiator, unscrew the drain cap on the radiator and drain the coolant.
3. At the next stage, open the hood and look for the pipes going to the heater radiator. They are located closer to the passenger side. We loosen the clamps by unscrewing the fastenings with a screwdriver and disconnect the pipes. Using a “7” wrench, unscrew the mounting bolts holding the radiator.
4. To complete the next stage of work, you need to move into the passenger compartment. Using a Phillips screwdriver, unscrew the screws that secure the glove box body. We dismantle the glove box.
5. Next, unscrew the screws that secure the storage shelf and dismantle it.
6. Under the shelf there is a faucet for the stove. To access it, you need to remove the right air duct. To do this, you need to unscrew the bracket nut with a “10” key and unhook the air duct from the latches that secure it.
7. Having unscrewed the bolt securing the cable casing that controls the faucet with a key “7”, remove the tip from the faucet lever.
8. Having unscrewed the fastening bolts, we dismantle the faucet.
9. We install a new part in its original place, changing the gaskets and lubricating the place of contact with the radiator with sealant.
10. We fasten the cable, checking its tension. The parts are installed in place in the reverse order.
11. Next, tighten the cap on the radiator and fill in antifreeze or antifreeze. We check that there are no leaks anywhere. Now you can screw on the glove compartment.

This completes the replacement of the VAZ 2107 stove valve. Knowing how to replace a VAZ injector heater faucet and doing everything yourself, you can save on servicing your car at a car service center.

IMPORTANT NUANCES

There are a couple of important nuances that should not be forgotten when installing a new fuel tap. Here they are:

• A new faucet always comes with several rubber gaskets. They must be installed without fail, even if it seems that the gaskets of the old faucet are practically not worn out and will still serve. The fact is that standard VAZ tires, from which old gaskets are made, last a year, or two at most. After this, microcracks appear in it, which are impossible to see with the naked eye. But gradually the network of cracks grows, and the tap begins to leak again. Therefore, installing new gaskets on the tap is mandatory;
• The second point is related to the operation of the crane lever. Before closing the hood, be sure to check whether this lever works well. More precisely, whether the length of the cable is well adjusted, and whether this cable allows you to fully open and close the tap. It often happens that the old cable after installing a new tap turns out to be half a centimeter shorter, as a result of which the tap cannot close completely due to the tension of the cable. If such a picture is observed, you should remove the fastening tip, loosen the nut on it, and pull out a little cable from it (usually there is a reserve of a couple of centimeters in the tip). After this, the tip should be put back on the tap lever and check whether the tap closes tightly;
• The third point is related to checking the tightness. Before closing the hood after installing the faucet, you should open the new faucet, then start the engine and let the car run for half an hour. During this time, the antifreeze will have time to heat up. If the tightness is broken somewhere, an antifreeze leak will occur, which will be difficult to miss. If no leaks are observed after running the engine for half an hour, the procedure for installing a new faucet can be considered complete.

So, even a novice car enthusiast can change the fuel tap on the “seven”. This does not require any special knowledge or skills. You just need to have a basic understanding of the design of the VAZ 2107 heating system and strictly follow the above recommendations.

Preparing for further work

First of all, you need to purchase a new faucet. When you come to a car market or store, you will be delighted with the variety offered to you. The ideal option would be to purchase a factory part. Even though such a faucet will cost more, you will not come across defective or low-quality parts that can leak immediately after installation.

Ceramic taps have proven themselves well, striking in their reliability and durability. You can take a chance and buy a ball valve (two-way), but they are also presented in a wide variety, among which there are many modifications. If the manufacturer adheres to technology, and the seller is honest with his customers, then the ball valve will fall into place like a glove and will serve properly for a long time. Which heater tap will be best for you depends on your decision, at least we have already expressed our opinion on this matter. You will have to buy more than one faucet. It will require gaskets for the faucet, which will replace the old ones, a pipe and a clamp with a diameter not exceeding 23 mm.

The mistake of some car owners is the decision to install a plumbing analogue instead of a damaged faucet. Only in some cases such repairs will be appropriate, but for the VAZ-2107, as well as 2105, this cannot be done. These vehicles have ductwork that makes installing plumbing faucets impossible.

In addition to the crane itself, it is necessary to prepare some tools that any motorist has:

• two keys for 7 and 10;
• pliers;
• Phillips head screwdriver.