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  #1  
Old June 18th, 2009, 03:36 PM
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Eric Lindstrom
1994 d-90 #1444
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Another overheating question

My 94 st seens to overheat when I drive in the city or am idling for a long time. It does fine (knock on wood) when I drive on the highway though. I checked all the hoses and replaced the thermostat but that still doesn't seem to help.
I recall reading a post about rolling up a newspaper and trying to stop the fan when engine is hot to see if it's a bad fan clutch.
Any info on this? And if so, are they easy to replace??

Thanks,
Lindy
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  #2  
Old June 18th, 2009, 04:32 PM
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Sean-Paul Ferrera
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This sounds exactly like what my 94 was doing even after full fluid change and new fan clutch.

This is the procedure, but if you do it wrong and chop a finger or hand off it's your own fault.

With the engine cold, start it and use a rolled-up newspaper to try to stop the engine fan - it should stop easily. Then let the engine get hot (meaning the engine compartment) and try to stop the fan - it should shred the newspaper. Diagnosis: If cold it shreds the paper, it is locked. If hot it stops the clutch has failed.

My problem turned out to be a radiator that road salt had destroyed so I wasn't getting any cooling. The radiator visibly looked okay until it was pulled from its frame during my engine swap and the fins disintegrated when touched. You may want to check the radiator before you go much beyond the fan clutch.

S-P
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  #3  
Old June 22nd, 2009, 10:54 PM
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Eric Lindstrom
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Thanks Sean.

I have added a tube of Redline wet wetter with no improvement. So now I have ordered a new fan clutch from autozone. It should be in tomorrow so we'll see if that changes things.
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  #4  
Old June 23rd, 2009, 05:18 AM
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Phillip
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What part number from autozone?
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  #5  
Old June 23rd, 2009, 10:03 AM
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Eric Lindstrom
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Part number 922301.

cost: $119.99
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  #6  
Old June 23rd, 2009, 03:17 PM
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Ive tried 4 of these and they dont seem to work, as in they dont seem to lock up when the truck gets hot.
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Old June 23rd, 2009, 10:03 PM
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Eric Lindstrom
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I'll let you know if mine works properly. Will be installing it tomorrow.
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  #8  
Old June 24th, 2009, 07:13 AM
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its a reversed thread, loosens to the drivers side.
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  #9  
Old June 25th, 2009, 07:52 PM
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Eric Lindstrom
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I installed the fan clutch today and (knock on wood) I haven't had any problems so far.
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