Rick's Free Auto Repair Advice

Posts Tagged: fan relay

P1489 and overheating 300M

 Fix code P1489 and overheating 300M Owners who have an P1489 and overheating 300M with trouble code  High Speed Fan CTRL Relay Circuit, here’s what to do. Remove the high speed fan relay and use a digital multimeter to check for power on the two terminals of the electrical connector. If you show power, reinstall the relay. Then ground the dark blue/light green wire at pin 69 of the PCM. The relay should click. If it doesn’t try swapping in a new relay or run a continuity test on the … Read More

Chevrolet Cobalt Overheats

My Chevrolet Cobalt Overheats There’s quite a bit of overheating chatter about this vehicle on tech forums about Chevrolet Cobalt Overheats. If the cooling fans come on, try bypassing the heater core with a length of heater hose. If the problem goes away, you’ve got a plugged heater core. Also, check the hose from the engine to the overflow (surge) tank to make sure it’s not plugged. If the cooling fan doesn’t come on, check the #1 (30A) fuse in the underhood fuse box. If that’s good, move on to … Read More

P1491 radiator fan won’t turn on

Radiator fan P1491 If you own a Chrysler minivan and it’s overheating because the radiator fan won’t turn on, it may be a bad radiator fan relay Many owners report overheating in their minivans because the electric cooling fan will not come on. This may be accompanied by trouble code P1491—Radiator Fan Control Relay Circuit Malfunction. Start your diagnosis at the fan relay module which is located below the battery box on the left frame rail. The Grey wire is hot at all times and fused by fuse #24 in … Read More


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