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FAQ: Audi a6 heater control valve?

What are the symptoms of a bad heater control valve?

Here are some of the warning signs of a bad heater control valve:

  • No heat comes out.
  • Heat is always on and you can’t turn it down.
  • Heater operates erratically, putting out more or less heat without any control changes.
  • Coolant leaks.
  • Low coolant level.
  • Higher-than-normal temperature gauge readings (from loss of coolant)

How can you tell if a heater control valve is plugged?

If the temperature still doesn’t change on the outlet side, suspect a stuck shut or clogged heater control valve. Pinch off the hose on the outlet side of the heater control valve (the hose closest to the firewall) and drive the vehicle at highway speeds. If the blower stops blowing hot air, you’ve found the problem.

What causes a heater control valve to go bad?

Heater control valves can also leak from excessive corrosion from contact with old or contaminated engine coolant. Usually a leaking control valve will have to be replaced in order to repair the leak.

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Can I bypass my heater control valve?

Heater control valve bypass is not standard on vehicles; it is a modification. When bypass hoses are installed, the coolant in your car will always be circulating through the heater core – that means that if the core starts leaking, you won’t be able to turn it off.

Why is my car blowing cold air when the heater is on?

A car heating system blowing cold air can be due to a faulty thermostat, low coolant fluid level, malfunctioning heater core, a leaking cooling system, or problems with heating controls and blend door.

How much does it cost to replace a heater control valve?

The average cost for heater control valve replacement is between $208 and $233. Labor costs are estimated between $89 and $113 while parts are priced between $119 and $121.

What controls the heater control valve?

The heater control valve (sometimes called the hot water valve) is used to control the rate at which coolant flows through the heater core. The valve is located on the heater inlet hose. Manually operated systems may use a cable, a vacuum motor or an electric solenoid to operate the valve.

Where is the heater control valve located?

The heater control valve allows the flow of coolant through the heater core to be controlled and switched on and off without affecting the operation of the rest of the cooling system. It may be located on the inlet or the outlet port of the heater core and activated by a cable, electronic control, or a vacuum signal.

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Can heater control valve cause overheating?

A coolant leak at the heater control valve is not only a problem in that it will disable the heater, but it will also compromise the cooling system which can cause the engine to overheat. They will be able to determine if the car needs a heater control valve replacement, or if a different repair is needed.

Why is my car heater not getting hot enough?

This may be caused by a stuck closed thermostat or other restriction in the cooling system. If this is the case the thermostat will have to be replaced. This can lead to engine damage if left alone. The engine can build up huge amounts of heat and overheat the engine which can lead to engine damage.

Will a radiator flush clean the heater core?

Flushing out the tubes in the heater core will allow the coolant to flow more easily so there will always be warm coolant to heat up the air going into the cabin. If water isn’t enough to remove all the sediment, you’ll need to use some radiator cleaner and let it soak inside the heater core.

How do you flush heater core?

Now, here’s how to perform a heater core flush:

  1. Step 1: Locate the Heater Core. First thing’s first.
  2. Step 2: Disconnect the Heater Hoses.
  3. Step 3: Apply the Pressure.
  4. Step 4: Hit it with the Hose.
  5. Step 5: Reconnect the Heater Hoses.
  6. Step 5a: Flush your entire cooling system with Thoro-Flush.
  7. Step 6: Refill the Coolant.

Is it safe to bypass the heater core?

Bypassing the heater core will effectively prevent the leak from happening but it cannot undo the damage that has already occurred as a result of the leak. There is probably a fair amount of coolant or water inside the heater core already in places that it wasn’t meant to get to.

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How does vacuum heater control valve work?

The heater control valve either permits or restricts coolant flow through the heater core, depending on whether vacuum is applied to it. It is a normally OPEN valve which closes when vacuum is applied. When the valve is open, coolant circulates through the heater core and you have heat.

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