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Old 06-14-2021, 10:34 AM   #1
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1990 Chevy chassis cooling fans not working

My 1990 pace arrow is overheating and I notice the cooling fans are not coming on . Does anyone know anything regarding operation of the fans ?
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Old 06-14-2021, 10:42 AM   #2
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On our 2004 Pace Arrow, I put a lighted rocker switch in the dash and wired them direct.
They also run when ever the AC is turned on based in the original wiring w/ the AC switch.
They do help cut down on the Engine fan running when in slow / hot driving conditions.

Mike in Colorado
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Old 06-14-2021, 08:56 PM   #3
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1st look behind condenser at front of the rad.. with strong flashlights and make sure not plugged.. then jumper the fans pos. Directly to bat.. see if runs.. if ok trace wires back to relay.. they could be anywhere.. some inside under dog house Dr side.. good luck.. get back to us so more members can help
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Old 06-20-2021, 01:51 AM   #4
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As Don suggests...start by eliminating whether or not the fan/s are bad by using some jumper wires and connect the fan/s directly to the battery. If they (or one works) you've narrowed the issue down.

If the fans work. Then follow the wiring back from the fans to the relay (very likely under the doghouse mounted up against where your accelerator pedal is. Carefully check the wiring while your at it.

One of those wires will run to the passenger side coolant temp sender which triggers the fans on/off. I believe the 1990 had the sender in the passenger side head/ If not it will be somewhere in the lower radiator area.

When you say overheating....is this while idling? Or driving?

As for cleaning the radiator. Get some coil condenser cleaner (foam). And spray both sides of the radiator and ac condenser. Let it soak for 10 mins or so then rinse from front then back. No hard jet stream of water.

One good clue that airflow is good is when you first fire the engine when stone-cold you should slightly hear the clutch fan engaged but you should also see both your ac condenser fans free wheeling.
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