New fan clutch not engaging


  #1  
Old 06-12-19, 08:22 PM
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New fan clutch not engaging

Same old 92' Ranger XLT with 2.9 V6. I recently replaced the thermostatic fan clutch. It's not engaging and it was 110 today, I checked the usual trouble areas.

I assume it's defective brand new out of the box. But someone suggested it could be a bad coolant temp sensor. I can see how a bad coolant temp sensor could affect an electric radiator fan since the sensor communicates with the powertrain control module.

But how can the sensor affect a non-electric mechanical thermostatic fan clutch? There isn't an electronic relationship between the two.................am I correct?

I'm inclined to just replace the fan clutch this weekend.
 
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Old 06-12-19, 10:49 PM
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The fan clutch is strictly a mechanical device on that vehicle.
 
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Old 06-13-19, 04:01 AM
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how are you testing it is the engine overheating? while its possible you may of gotten a defective one the metal coil on the fan clutch actually needs to get heated up to engage.
 
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Old 06-13-19, 04:19 AM
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Fan clutch will spin freely until engine temps warn up. Not sure what temp it takes to engage but I would guess around 200 degrees.
 
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Old 06-13-19, 08:29 AM
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I was testing it in slow stop-and-go traffic with very hot climate. It's definitely not engaging. And you're right. It generally kicks in around 200 degrees.

It's not overheating because I time my driving to avoid slow traffic...unless testing. As long as I don't drive slow, ram air through grill keeps temperature down.
 
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Old 06-13-19, 10:52 AM
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If you have a temp gauge, park it and watch the gauge and fan at idle. If you have AC turn it on to load the engine. If no AC leave the heater fan turned off in the cab.
 
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Old 06-13-19, 01:13 PM
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Did that to Marbob. After work, off to NAPA for a new one
 
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Old 06-13-19, 07:32 PM
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I see. I take it the engine heated up.
 
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Old 06-14-19, 12:36 PM
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Correct. It heated up more than it normally did with a good fan clutch. Also I am used to hearing the noise when the clutch kicks in, which I'm not now. I'll install a new one this weekend.
 
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Old 06-16-19, 08:12 PM
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I installed the new fan clutch this weekend. Everything is back to normal. I can hear the fan clutch engaging now, In fact it kicks in at about 190 degrees. And it cools down temperature spikes fast. Thanks
 
 

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