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Old 10-20-2007, 11:46 AM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
<1) At some temp the low speed fan circuit should turn on the fans and they should run continuously until the temp gets low enough to turn them off - or - the high speed circuit kicks in.
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Low fan is the diagnosis, but Low speed fan has nothing to do with temp sensing.. It is turned on by the a/c high-side presure switch when the a/c system is being used.
It will passively effect coolant temps , but it is a completely different system than the cooolant temp sensed high fan circuit .
The fuse uprade is correct.
If the fuse is OK, The most common fault of no low fan is low refrigerant level, where the high side pressure does not attain sw. cut-in pressure spec for low fan relay activation.
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