Full Answer
How does the heater work on a Volkswagen Golf?
At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater core. At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers. If the heater has stopped working in your Golf, this process has failed in one way or another.
Why is my VW Golf not heating up?
While not having enough coolant may make your engine run hotter, it can also cause your Golf to not be able to create enough heat. Is there isn’t enough line pressure, due to low coolant, then the heater core will not be able to get any coolant itself.
What does the thermostat do on a Volkswagen Golf?
The job of your Golf’s thermostat is to regulate the temperature of the engine. It does this by allowing water to enter the engine when it is getting hot, and by keeping coolant from entering while the vehicle warms up. Sometimes when a thermostat goes bad, it stays stuck open.
What to do if the heater stops working on a golf?
If the heater has stopped working in your Golf, this process has failed in one way or another. A word of caution: If there is no coolant in your overflow, you can refill it by adding more to the overflow reservoir. There is almost never a situation where you would need to take the radiator cap off of the radiator to add coolant.
Where is a heater control valve located?
heater inlet hoseThe 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.
How can you tell if a heater control valve is clogged?
Common signs include the heater not working, coolant leaking from under the engine, and no voltage across the heater control valve....Usually a bad or failing heater control valve will produce a few symptoms that can alert the driver of a potential issue.Heater doesn't work. ... Leaking coolant. ... Erratic heater behavior.
How do you fix a heater control valve?
2:224:19How to Replace Heater Control Valve 06-10 Ford Explorer - YouTubeYouTubeStart of suggested clipEnd of suggested clipPull your new one we just wet it down a little bit to make it slide into the hoses. Better. PullMorePull your new one we just wet it down a little bit to make it slide into the hoses. Better. Pull your hose up stick it down twist. And then squeeze the clamp. And bring it up into place.
Can you bypass the 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.
What would happen if the heater control valve was stuck closed?
Heater Control Valve Stuck Some vehicles use a heater control valve that only opens (allowing hot coolant to flow through the heater core) when the heater control calls for hot air. The heater will fail to produce warm air if the control valve is stuck closed, leaking or disconnected from the heater control.
How can I tell if my heater core is clogged?
This could be due to a clogged or failed heater core, which is responsible for dispensing warm air into the cabin via the blower motor....Key signs to look out for:Weak or no airflow.Cold air (not warm) coming through the vents when the heater is on.Coolant leakage visible inside the cabin or a damp smell.
Why is my car blowing cold air when the heater is on?
Low Coolant Level The coolant (usually a mixture of water and antifreeze) in your engine doesn't just work to keep the engine from overheating: It's also the source of heat supporting the heating system. If there isn't enough coolant in your system, the heater core will blow cold air into your car.
How much does a heater valve cost?
A furnace gas valve replacement costs $200 to $800 on average. Furnace gas valve prices are $75 to $300 for the part alone or up to $600 for original manufacturer parts (OEM). Gas valve replacement labor costs $125 to $500. Furnace gas valve repair costs $75 to $200.
Does the heater control valve affect the AC?
If the heater control valve fails or gets stuck, it will not be able to allow hot coolant into the heater core so that the heater can operate. If the heater does not have hot coolant the AC system will not be able to blow hot air, and the front defroster may not work.
Do you need a heater control valve?
Not all cars have a heater control valve The motion of the blend door balances the amount of hot and cool air coming through the interior vents, based on the climate control system settings chosen. In a blend door system, the heater is always on, so a heater control valve is not necessary to regulate its output.
Does coolant flow through heater core when heater is off?
When you turn on the heat inside your car, air blows over the heater core, is warmed and comes into the cabin. Some vehicles have a heater valve that directs coolant through the heater core when the heat is on and bypasses the heater core when the heat is off.
What controls the heat in a car?
The warmth from the engine goes from the radiator to the heater core, which basically acts as a heat exchanger. It allows coolant to flow through, and this flow of coolant is regulated by the heater control valve. As the engine's heat is carried by coolant into the heater core, the device starts to get warm.
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What is a heater control valve?
The heater control valve moderates the amount of heat the cabin gets when the heater is in use. It does this by regulating the amount of hot engine coolant that can enter the heater core.
What are the symptoms related to a bad heater control valve?
When the heater control valve fails, adjusting the temperature may not change the air temperature at the vents, whether hot or cold. Also, the valve could leak engine coolant, possibly causing the vehicle to overheat.
Can I drive with a heater control valve problem?
If the heater control valve is leaking, you shouldn't drive the vehicle — overheating can result from any coolant leak. In this situation, it's best to have the vehicle towed to a repair shop.
How often do heater control valves need to be replaced?
The original heater control valve for most vehicles should last for about 100,000 miles. Low-quality replacement heater control valves will more than likely fail much more quickly.
How are heater control valve issues diagnosed?
Heater control valves are easily diagnosed by observing whether the valve responds when the temperature selector is adjusted.
How is a heater control valve replaced?
The heater control valve is separated from the heater core hoses and control mechanism, which could be a vacuum line or a cable. Then the valve is removed from the firewall, and replaced.
RepairPal recommendations for heater control valve issues
This is a good time to check the heater core hoses and replace them if they're leaking or corroded. A thorough cleaning inside the heater hose ends usually helps prevent a leak. It's also a smart time to check the condition of the coolant.
How does a golf heater work?
At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater core. At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers. If the heater has stopped working in your Golf, ...
Why is my golf engine not heating up?
Low Coolant. While not having enough coolant may make your engine run hotter, it can also cause your Golf to not be able to create enough heat. Is there isn’t enough line pressure, due to low coolant, then the heater core will not be able to get any coolant itself.
Why is my heater not working?
If the heat is blowing, but blowing cold, it has something to do with the coolant getting to the heater core, or the heater core itself.
What does it mean when a heater hose is hot and cold?
If one of the hoses is hot, and the other one is cold, that is a pretty good indication that the heater core is clogged. If the neither hose has any heat, you may have air in the cooling system, low fluid, or low pressure.
How to tell if radiator is hot or cold?
The overflow reservoir will be connected to the radiator by a tube coming from the top (usually right by the radiator cap). It should have separate lines to indicate “cool hot” and “cool cold”. Some vehicles only have full hot. Never touch the radiator cap unless the vehicle is ICE COLD.
What is the job of a golf thermostat?
The job of your Golf’s thermostat is to regulate the temperature of the engine. It does this by allowing water to enter the engine when it is getting hot, and by keeping coolant from entering while the vehicle warms up.
How to tell if your golf is cold?
If your Golf has a built in temperature gauge, take a look at it and see if it is in the spot it is normally in after a bit of driving. If it looks like it is colder than normal, that’s a pretty good indication that there is something wrong with the thermostat.
