Question about 1994 Jeep Grand Cherokee

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Heating system outlets

This morning my 1994 Grand Cherokee began emitting white smoke from the defroster vents. I stopped the vehicle, pulled over and turned up the fan. Shouldn't have done that. Immediately the whole passenger compartment was filled with smoke! It was OK the night before, a mouse couldn't have built a nest in there during the night- or what do you think? The heater blower doesn't make any unusual noise. A 20A fuse [no. 1 position] is blown but I can't find anything not working properly. Any suggestions?

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  • denfred Nov 05, 2008

    As I stated previously, I don't know what the no. 1 (20A) fuse was for - and I don't have an owner's manual to show what it is intended for.

    The smoke did not have a sweet smell to it and it was not steam from any antifreeze. I recognize steaming antifreeze when I smell it.

    That's why I rated the first reply as "thanks for trying." The answer didn't help any.

    There was no antifreeze leaking out any place where it could be seen. The smoke was actually more grayish in color and it smelled hot like something burning - more like burning grass or some other combustible material.

    Note: since then I have driven the vehicle and have not seen any more of the smoke even after playing with the heater controls. The smell lingers, though. The engine is not running hot and seems o.k. Two men came over to my vehicle when it was smoking so badly and they both thought it was probably from a mouse nest catching fire in the heat vents.

    ??? Still wondering.

  • denfred Nov 05, 2008

    This response sounds reasonable and much more likely pinpoints the smoke problem. Yes, I have trees surrounding my yard and they often lodge on the lower windshield area. So I'll consider this the answer unless something else happens.

    Thank you very much for your response. It has been very helpful.

  • denfred Nov 09, 2008

    One final statement regarding this problem - I had a proffessional look at it and he found a mouse nest that had come in contact with the fan control resistor. He said it looked as though I had a pretty good fire going in there! But that's been removed now. Thanks for the help.


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I have a 1994 jeep grand cherokee and i had the water pump replaced as well as thermostate and all hoses but now when i turn on the heater smoke blows out what is the cause ?

Posted on Nov 15, 2009

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1st, the fuse location is marked, what is the 20 Amp fuse for? 2nd, did the smoke have a nauseating sweet smell to it? If it smells like described it is the heater core leaking, coolant steam looks like smoke.

Posted on Nov 02, 2008

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  • yadayada
    yadayada Nov 02, 2008

    You haven't answered the questions, why the thanks for trying, do you think that is fair as a rating? claims they have factory repair manuals, they have nothing of the sort, some experts may have manuals. Experts are not employed by, we help free of charge as much as we can with the general automotive knowledge we have learned while working as auto technicians, specific test values are unique to each car line, these are not in most cases available to us. Thanks for using FixYa!

  • yadayada
    yadayada Nov 05, 2008

    The smoke was likely part of a leaf that got into the air intake and laid against the blower fan speed control resistor, I saw this allot but it slipped my mind until you said it smelled like burning grass, you should have the blower motor pulled and that debris removed, do you park near or under any trees's?

  • yadayada
    yadayada Nov 05, 2008

    I am sure that is the problem, It can cause a fire so get what ever is left in there removed ASAP.


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