SENSOR LOCATION INFOviewtopic.php?f=80&t=728&p=1025&hilit=camaro+sensors#p1025Sensor Locations
I recently helped a local guy trouble shoot his 1996 corvette cooling fan issues,
it was partly caused by following the advice of the local advance auto parts counter guy ,when he found a code P1641 which according to the print out at the auto parts store indicates a failed fan relay, he purchase three new 4 pin relays, because theres three relays and he had no way to verify which relay failed and since all the relays were 17 years old he figured they were due to be replaced if one failed. and installed them after being assured that all three relays are interchangeable
(THEY are not IF YOU BUY 4 PIN INSTEAD OF 5 PIN RELAYS)All 3 relays are in the dual cooling fan circuit----check fuse #29 inside the car--right side of dash when you open the passenger door---this is on the low current control side of the fan relays---both fans have this fuse in common--this should be either a 5 or 10 amp fuse---whether or not the fans come on at a given engine temp and /or if the A/C is turned on-- is ultimately controlled by the PCM .


http://www.ecklerscorvette.com/corvette ... -1996.htmlhttp://www.parts123.com/0000050f/244508 ... 244508.htmviewtopic.php?f=57&t=3010&p=7916&hilit=relays#p7916 heres what the 1996 corvette shop manual saysThe cooling fans are controlled by the PMC based on various sensor inputs.
Ignition voltage is supplied to all three cooling fan relay coils.
The PMC controls cooling fan #1 by providing the ground path.
The PMC controls cooling fan relays #2 and #3 together by providing a ground path.
The left and right cooling fans are connected in series.
this will enable both fans on low speed when the #1 fan relay is energized.
when all three fan relays are energized , both fans will operate at high speed.
the high speed is possible because the fan relays are wired in a parallel circuit.
when the PMC detects that certain DTCs are set, the PMC will enable the cooling fans.
the ECT sensor (ENGINE COOLANT TEMP)must be tested
Engine Coolant Temperature Sensor. 185 Ohms @ 210F, 3400 Ohms @ 68F, 7,500 Ohms @ 39 F. the pmc will command the low speed fans to turn on at 219F and off at 207F and the high speed fans ON at 228F and off at 214F