Question about 2001 Mitsubishi Eclipse

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Heater blows cold air

Why is my heater blowing cold air. I have a 2001 mitsubishi eclipse and when it idles, it blows cold air (no matter how long it is running) as soon as I start driving it warms up, but when I come to a stop, its back to cold.

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  • shell8420 Dec 06, 2008

    we checked all the fluids and everything if full

  • shell8420 Dec 07, 2008

    we have noticed that lately it has been running hotter than usual. I was told tonight that it may be my thermostat, but I'm not sure

  • shell8420 Dec 14, 2008

    We haven't flushed it in a while. We were planning on trying it, but it snowed so we haven't done it yet. I'll let you know as soon as we do. Thanks for the advice

  • tjgrz11 Jan 06, 2009

    I have the same issue. For a while it was just the driver side blowing cold air and the passenger side was hot, but that is now fading too and getting colder. When I'm at idle i can't have it on defrost or else it stalls the car out. Coolant condition and level is good.

  • tcg711 Jan 21, 2009

    Please let me know if anyone finds the solution to this problem. I've been dealing with it for 3 years now. It sucks in the winter.

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I had the same problem with the heater only working when accellerating. Found the overflow tank pick up tube was kinked. This of course made my coolant level low. So when the cars hot the coolant would push into the overflow, but when the car cooled the kink would prevent it from flowing back to the radiator.

Posted on Sep 04, 2011

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Check your coolant level, if it's low u won't have adequate heat. If that isn't it, let me know.

Posted on Dec 05, 2008

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  • Curt Downs Dec 06, 2008

    What does your engine temp gauge indicate? Is it in the normal range, or running on the cold side of normal?

  • Curt Downs Dec 07, 2008

    what is the coolant condition (last time system was flushed, new coolant added)? Because u say it's running a bit hotter than usual, that can indicate a radiator that may be plugged up from rust/ corrosion, and if that's the case, the same problem would exist for the heater core, causing poor circulation thru the heater core. The flow increases when u drive/decreases at idle, so that would explain what u describe.

  • Curt Downs Dec 14, 2008

    I would greatly appreciate it if u would let me know what u find is wrong w/ the no heat problem. Thanks!

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