Our 2004 Jeep Grand Cherokee Laredo (V6) check engine light came on during our first cold spell about two weeks ago. Mechanic said he saw code for "heater failure" but kept it all day and it ran fine. Mechanic also said they checked it over and could not figure out why the light went on because it was running perfectly fine. All gauges were fine and no fluids leaking or low. Needed an inspection for NYS so I had to wait 30 miles and drove it 60 miles in a week with no problems. Had inspection done a week ago and it passed. Last week, noticed squeaky belt noise on idle at traffic stops a few times but chalked it up to extreme cold again as car ran fine. Today, put on heater and noticed a slight burning smell when I exited car. Got back in car five minutes later and noticed nothing leaking. Got back in car, turned on heat and noticed temp gauge just starting to creep from dead middle to slightly right but not higher. Turned off heat and it started to creep back down and stay left of middle. Now I am paranoid there is a problem. Does this sound all normal or am I correct in suspecting an issue?
If your "check engine" light is turn on, I suggest scanned the PCM to know exactly what fault code is stored there. Additionally, could be some problem with the "temp sending unit".
Keep us updated.
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Thank you! Mechanic reset the panel and check engine never came back on. He said the code didn't correspond with any problems and everything tested fine. That was about two or three weeks ago. I am thinking drive without the heater on for now. :)
OK Angela, if the light turn on again, try toe make the On/Off switch test to "read codes" procedure (http://www.fixya.com/marketplace/service... ) and send us this code number for additional details.
Goos luck.
Thank you. :)
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