Question about 2001 Jeep Cherokee

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2001 cherokee sport

My heater is not working and it idles rough sometimes when i start it. What is the problem??????

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  • steveng25 Aug 25, 2008

    It just doesn't produce heat. The idle does smooth out after awhile or if you rev up the engine for a minute or so. It doesn't seem to matter if the engine is hot or cold.

  • steveng25 Aug 26, 2008

    Yeah it reaches operating temp within 5 minutes. I had the radiator and thermostat replaced awhile back but the heat just will not come out. It will get a little warm but not very much.

  • Randy Harkins
    Randy Harkins May 11, 2010

    does the heater fan not work or does the heater not produce any heat?

    Does the idle smooth out after a bit? is it when the engine is hot or cold?

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  • Master
  • 335 Answers

The heat control valve, this is the valve that allows hot engine coolant to flow into the heater core inside the dash , if its decective it will not open to let the coolant to flow.
The Thermostat if it is bad (stuck open) the car will not warm up and will also cause a no heat problem as well as many other issues.
Does the car warm up quickly and reach operating temp within about 5 min?

Posted on Aug 26, 2008

  • Randy Harkins
    Randy Harkins Aug 26, 2008

    The only other item in the system is the heater core it cam be plugged the easiest wat I found to clear it is disconnect both of the heater hoses at the firewall, Use a air compressor and a blow gun to carefully blow air in one side of the heater core then the other side if you havent changed the antifreese in a while it gets gummy and if you had a leak and added chemical cealer that can plug a heater core.

    Careful! the junk coming out of the opposite side of the heater core will shoot out quite violently be careful please

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