Why is my car heater turning cold?
Hot coolant from the engine passes through a heater core, which looks and functions a lot like a small radiator, and a blower motor forces air through it. It’s also the reason that a plugged heater core, stuck thermostat, or air in the cooling system can all cause a car’s heater to blow cold.
Why does my heater go 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.
How do I know if my car heater is blowing cold air?
When air gets trapped in the cooling system, it causes air bubbles, which will need to be flushed out to fix the issue. Plugged Heater Cores Check to see if the coolant is flowing through the heater core with a non-contact thermometer. If not, flush the heater core and this should fix the problem.
How does the heater work on a Volkswagen Passat?
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 Passat, this process has failed in one way or another.
Is the AC on in my 2000 Passat?
My 2000 passat is blowing cold air, ac works, coolant system flush completed, both hoses to fire wall get hot. Car does not overheat when driving. Thanks for providing excellent info, this makes it much easier to give advise!
Why is the thermostat on my Volkswagen Passat not working?
The job of your Passat’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 hot water heater blowing cold air?
Heater core exterior: The heat-radiating fins on the outside of your heater core could also be clogged with debris that makes its way in from the outside air intake at the base of the windshield. This can affect the heater’s output.