My heater in my 2003 Honda Civic LX Coupe is not working well. When my car is heated up, it begins to blow hot air, like normal but after about 2 minutes, it goes straight back to cold?
Question type: General
After my car is heated up, it blows hot air, like it should. Then, after about 2 minutes or so of driving, it goes back to cold air even though my car is heated up. It also fluctuates back and forth after this between hot air and cold air...
7 Answers
Rowefast answered about a year ago
Sounds like it may be low on coolant? or the thermostat may be getting bad. One other thing it Might be is the HVAC Heater Control Valve in the heater hose may be causing the grief.
Clitten21 answered about a year ago
I have a new thermostat in it. Just put it in about a week ago and saw it open up myself. I'm still having this issue, it's not low on anything either. Also, when going up a mountain called Green Mountain here in town, my car over heats. I've gotten out of the car when it does and have noticed that the fan is only kicking in whenever it feels like it, or when I press the AC button on the dash. I've replaced the fan switch from having this problem before and it worked fine for a couple of months but is now doing the same thing as it was before.
Rowefast answered about a year ago
Also did you purge the cooling system from air when refilling with coolant? With the cap off until thermostat opens?
Clitten21 answered about a year ago
Yes, I had help from a very good friend of mine that works at Auto Zone and he came out of the store to do it with me.
Rowefast answered about a year ago
Does the temperature gauge stay at normal operating temp. on the dash? And is it only the heat that goes from hot to cold?
Clitten21 answered about a year ago
The temp gauge stays normal on the dash unless I use the car for awhile or if I'm driving up a mountain. Then it begins to climb into the red. And yes the heat goes from hot to cold, then back and forth.
Rowefast answered about a year ago
Well, to me it still sounds like there is air in the system. And those fans have to work properly, but have nothing to do with the heat in the car, just the temp. of the motor. You can check by running the car, when it starts to blow cold air, check the heater hoses. I suspect one would be noticeably cooler than the other one, indicating that there is still air in the cooling system. Some cars are very difficult to purge. There are garages out there that have a machine to purge the cooling system.
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