Question about 1997 Jeep Grand Cherokee

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Heater fan quit working

Fan for heater stopped working. is it possibly in the electrical system or just a blown fuse? dont have owners manual so dont know which fuse to check. any help would be appreciated greatly.

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Horn fuse should be labeled on the fuse block. If it's not, easiest way to check is to just check them all. Use a test light and probe the back side of each fuse on both ends, till you find one that only has power on one side. Horn works with key off but I generally check with key on. Also, you have a horn relay (should be in the power distribution center (basically another larger fuse box, usually on the right fender under the hood. If all else fails, run a "hot" wire right to the horn & make sure it works. Horn "switch" is actualliy part of the signal mechanism and internal parts within the steering column...though these sometimes develop dead spots, it's least likely that it is the source of your problem.

Posted on Jan 27, 2009

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1 Answer

Heater fan fuse


David I dont have th schematics for your fuseblock layout for your vehicle but when I am having problems with a component in my vehicle I use a pair of pliers or a fuse puller and pull all of the fuses one at a time and check them for being blown. If I find a blown fuse I replace the one blown with the same size. If you are having problems with the fan motor I would suggest that you find where the wires hook up to the fan and check them for 12volts using a volt meter. If you have the voltage chances are that the motor in the fan is no good. Hope this helps

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We dont have te owners manual to the car and the horns not working. we think it may be a fuse but dont know wich fuse to check


First of all, if your horns are not working, it is NOT CAUSED by a fuse! Fuses do not cause electrical system failures. Blown fuses are ALWAYS THE RESULT of an electrical system failure.

Please read the following articles:
Where's The Fuse?

What Else Could Be Wrong?

Also, if you need an Owner's Manual, a free PDF version can be donloaded at the link below.

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Bad Blower MotorIf the fan only works on setting number 3 or 4, or just on the highest setting, it is most likely that your blower motor is failing and is about to die. Use a voltmeter to test the amount of voltage at the blower motor connector with your ignition on and AC running. If it reads 12V, the motor needs replacing.Automatic Climate Control SystemAnother thing that causes the blower fan to malfunction is the Automatic Climate Control System (ACCS). If the ACCS's settings are off, it may cause the fan to stop working. If it is the climate control on the car, typically it is a bad thermostat or electrical circuit that is the culprit.
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BY COMPLETELY STOPPED WORKING I ASSUME THERE IS NO AIR FAN BLOWING OR THERE IS NO WARM AIR COMING OUT OF THE VENTS? IF THIS IS SO, FIND THE FUSE THAT CONTROLS THE HEATING SYSTEM AND SEE IF IT IS BLOWN, IS SO REPLACE IT. IF IT WORKS BUT BLOWS ANOTHER FUSE YOU HAVE A SHORT. BEST LEFT TO AN EXPERT. OTHER THEN THAT THERE IS NOT MUCH MORE THAT CAN GO WRONG WITH HEATERS, THERE IS HOWEVER AN OUTSIDE POSSIBILITY YOUR TSTAT IS STUCK CLOSED OR YOUR ENGINE FAN IS NOT WORKING IF IT IS ELECTRIC, OR YOUR FAN CONTROL MODULE IS ON THE WAY OUT.

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The dealership knows, but they won't tell you so you take it to them and they make the money doing the job!!

First of all, check that fuse. It may be blown. If so, replace it with a 30 amp fuse if that is what the owners manual or fuse panel states.

Now, about your problem, does your heater blow on low and high, but nothing inbetween? Or maybe even only on high, but none of the other settings? If so, it is your 'blower resistance module'. It is an electrical component located up under your dash board, possibly on the passengers side, up beside the fan blower itself. Find your fan vents where they come out the bottom of the dash and locate a black plastic box that resembles a relay. It will have a wiring harness attached to it, with about 4 or 5 wires. Take out the 4 - 1/4" or 5/16" bolts. Disconnect the harness.

The new one will probably have to be ordered in for you, around $30-$40. Try your local auto parts store or AutoZone.

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