My Heater only works when car is not moving

1999 TOYOTA CAMRY
388,000 MILES • 2.2L • 4 CYL • 2WD • AUTOMATIC
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TRELLCKC
  • MEMBER
  • 1 POST
I have to start car and let temp go to normal.My Heater only works when car is not moving. Once I start moving temp goes back to c ,and heater blows cold.Can You please tell me what the problem is?Thanks
Dec 25, 2013 at 11:55 PM
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FREEMBA
  • ✓Experienced Mechanic
  • 1,152 POSTS
First thing is to check the coolant level. As the coolant leaks out and the level drops the heater will lose its ability to heat because the system doesn't have enough coolant. Let me know how this checks out. Another problem could be a faulty heater control valve, but lets take it one step at a time. It sounds like you have a temperature blend door actuator that is not working, bad engine thermostat or the engine is low on coolant, here is a video and guide to help you find the problem.

https://youtu.be/SNRb6pSwYuU

and

https://www.2carpros.com/articles/car-heater-not-working

Please run down these guides and report back.

Nov 26, 2020 at 2:06 AM
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