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Old 08-22-2007, 10:17 AM
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dpetryk dpetryk is offline
Electrons can do anything
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,071
As previously mentioned I agree you probably have two problems. 1. Low on freon. This will cause the air entering the radiator to be preheated and if the main fan is not functioning the engine will get hotter than normal. 2. The main fan clutch is probably not engaging properly. It is controlled by the temp of the air passing over it. AT the temperatures you mention it should be locked up tight.

If you want to test the electric fan, jumper the two wires connected to the pressure switch mounted on the receiver/dryer located in front left side of the radiator. There are two pressure switches. One has a wire lead attached about 4" long and it is the smaller of the two, the other does not have a lead wire. Jumper the switch with the lead wire attached. Disconnect the harness from the switch lead wires and jump them together. The fan should come on low speed.

Getting the freon to the proper level will actually make the engine run cooler since the aux fan will run when it should.
I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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