Its possible the heater core is plugged. Check the hoses going into it, they both should be close to the same temp, with the inlet being very hot. If the inlet is hot and the outlet cool, heater core is plugged.
Full Answer
What are common reasons my Volkswagen Golf has heater problems?
While there are a variety of reasons your Volkswagen Golf heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
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.
What happens when the thermostat on a Volkswagen Golf goes bad?
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. This allows the coolant to continuously enter the engine.
Why is my car heater not working while driving?
Not having a functioning heater makes driving much less comfortable, and can be a sign of certain issues. At the simplest level, there are two main reasons why the heater is not working. If it’s not coming on at all, it’s usually either the blower motor or some other wiring issue.
Why does my car heat only work on high?
Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. And when one or more of these resistors burn out, you're usually left with only one heater blower motor speed—high. The resistor module is easy and inexpensive to replace.
Why does my heater not work unless Im driving?
Your Coolant System May Be Airlocked If your heat only works when driving, this can also be caused by air pockets. Air pockets within the cooling system can prevent adequate coolant circulation and are sometimes the result of low coolant or a faulty radiator cap.
Why does my fan blower only work on high?
When a blower resistor fails, the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage. When the resistor is working, it reduces the amount of voltage going to the lower fan speeds so the fan runs slower.
Why does my VW not heat up?
There are two main reasons for this. Either there is a problem with the thermostat in the heating system or the heater core has a blockage or air in it. To see which of these two problems is causing the fault, drive your car for a while and get it up to its working temperature.
Why does my car heater get cold when I stop?
You may have trapped air in the cooling system or the heater core may be partially plugged up. Engine coolant is delivered to the heater core through two heater hoses.
Why does my heater only work when I rev the engine?
However, if the heater only warms up when you rev the engine, that is a sign a component is amiss. One of which is the heater core. Although the thermostat greatly affects the engine temperature, typically, the engine will overheat if it's deficient.
Why does my heat and air only work on high?
When the resistor fails, typically, the highest setting is the only option that still functions. This is because the air from the blower motor is bypassing the resistor, thus gaining the maximum amount of voltage, resulting in full power. In other cases, there could be an issue with your AC module or the fan switch.
Why does my blower motor only work on low?
When a blower resistor fails, the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage. When the resistor is working, it reduces the amount of voltage going to the lower fan speeds, so the fan runs slower.
How much does it cost to replace a blower motor resistor?
The average cost to replace the blower motor resistor at a repair shop is between $44 and $55 in parts and $70 in labor costs, for a total cost of around $114 to $125.
Why is the heater blowing cold air?
A clogged filter is one of the leading reasons for a heater blowing cold air. But even if you swap the air filter with a brand new one, dirt and debris can still be found within the unit. This could eventually lead to overheating. If your furnace looks pretty dirty, call an HVAC provider for a professional clean.
How do u know if your heater core is bad?
Five Signs Your Car's Heater Core Is Going BadFog Inside Your Car. Two things could be going on if you have fog inside your car. ... Sweet Smells in the Car. The sweet smell in your car might not be your perfume or the donuts you're taking to work. ... Constant Engine Coolant Loss. ... Cold Air in the Cabin. ... Cold Cabin/Hot Engine.
How do I fix the heat in my car?
1:0010:55How to Fix a Car with No Heat (Easy) - YouTubeYouTubeStart of suggested clipEnd of suggested clipYour car might not have a radiator cap like this. So just check your owners manual it'll tell youMoreYour car might not have a radiator cap like this. So just check your owners manual it'll tell you how to check your coolant.
What happens when the heater control valve fails?
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, p... Read More
What happens if your thermostat is stuck?
The bad thermostat can cause two different sets of problems, depending on whether it's stuck open or stuck closed. A thermostat that is stuck open can cause the engine to run c... Read More
What happens when a blower motor fails?
When the blower motor fails, the air conditioner and heater may still work, and heat or cool may be felt at the vents, but the air pressure will be dramatically decreased. This ... Read More
Why does my car smell like engine coolant?
A failing heater core may cause the car's interior to smell like engine coolant. The smell will become worse when the heater is turned on. The engine may also begin to run hotte... Read More
Why are VW TDIs getting check engine lights?
According to a source who spoke to TTAC under the condition of anonymity, many Volkswagen TDI owners are arriving at dealerships after seeing check engine lights for failing AdBlue (diesel emissions fluid) heaters.
How long is the warranty on an AdBlue heater?
The AdBlue heater in question is covered under warranty for up to 36,000 miles or 3 years, whichever comes first. However, many of the failures are happening just outside of that warranty window, at around 50,000 miles or 4 years of ownership.
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.
How does a heater work on a transporter?
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 Transporter, ...
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 transporter thermostat?
The job of your Transporter’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.
Can a heater core go bad?
The heater core itself can go bad. Over time, they are known to clog and fail. If you have a heater core that clogged, it’s not going to be able to pass coolant through. Without the warm coolant going through it, there can be no heat. A bad heater core can also leak, so watch out for that.
Can you kick on a radiator fan without a key?
The exception to that would be when you would have reason to believe that the hose going from the reservoir to the radiator is clogged. Anytime you’re putting your hand around the radiator or fans in the engine assume that they are hot and that the fans can kick on at any time, even without your key in the ignition.