Question about 1988 Jeep Cherokee

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AC fan speed

AC fan only works on high speed. all low speeds are inop.

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  • Anonymous May 17, 2009

    Fan motor resister, mine died at 70K, quick swap, got the part from the (chevy, not toyota) dealer (the parts are different). a few google searches or a helpful counter guy will help you find where it is located, mine was a like a circuit board, all delaminated, and some shorts, I expect poor design for location, I here this is a common problem.

  • Curt Downs May 11, 2010

    Hey Jetlag, sorry, don't know the answer to your problem (faulty switch ? would be a guess). How about when u turn on heat, no air, does the fan operate in all speeds?

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I had this same problem in my chevy prism-- my fan regulator had broken. (apparently it usually happens around 100k miles, i hear) in my car, the vents wouldn't even blow air at all on anything but high--- not just AC, but normal vented air as well.

cost about $80 to have the problem fixed by my mechanic in Jersey. hope that helps!

Posted on Nov 16, 2008

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Are the fans running on low or high ?
Circuit/System Description
The engine control module (ECM) commands the fans ON in either high speed or low speed, depending on cooling requirements. In low speed, both fans are turned ON at a reduced speed. High speed has both fans turned ON at full speed.
In low speed operation, the ECM applies ground to the coil side of the fan low relay. This energizes the coil and applies voltage directly to the left cooling fan through the switch side of the fan low relay, which is fed by the fan 1 fuse. The right fan is connected in series to the left fan through the de-energized fan control relay so that both operate at low speed.
In high speed operation, the ECM applies a ground to the coil side of the fan low relay, the fan control relay , and the fan high relay. On the fan high relay, the energized coil closes the switch side of the relay and applies voltage directly to the right cooling fan through the switch side of the relay, which is fed by the fan 2 fuse. At the same time, the ECM energizes fan control relay pulling the switch side over, providing a direct path to ground for the left cooling fan, which has voltage applied through the energized fan low relay. In high speed mode, the fans are operated as a parallel circuit with full voltage applied to each.
You should have it hooked up to a scan tool that can read engine sensor data parameters . Check for DTC'S - diagnostic trouble codes etc...
Circuit/System Verification
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Hi Maria , The A/C system wouldn't keep the fans from running but none working cooling fans will keep the A/C from working ! This is a fairly complex system if your not familiar with this sort of thing ! I will add the description from the factory service manual.
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The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the powertrain control module (PCM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block.
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