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

P1489 High Speed Fan CTRL Relay Circuit

P1489 High Speed Fan CTRL Relay Circuit If you have a P1489 High Speed Fan CTRL Relay Circuit trouble code, this post will help you understand what it is and how to fix it. The high speed on the radiator cooling fan is turned on and off by a relay. The PCM has detected a problem in the control portion of this relay. The control portion is the magnetic coil that moves the contacts to open of close–the contacts that feed power to the high speed side of the cooling fan. … Read More

P1491 radiator fan won’t turn on

Radiator fan won’t turn on and trouble code 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 … Read More

Radiator fan runs after shutdown, drains battery

Radiator fan runs after engine is off and drains battery If you own a Chrysler minivans and the radiator fan runs after shutdown and drains the battery, read this. Some late model Chrysler minivan owners may experience a problem with the cooling fan running after the engine is shut down. That, in itself, is not so unusual—many vehicles do that. But when the cooling fan relay gives up the ghost, the cooling fan runs all the time, draining your battery. Diagnosing the problem is easier than finding the relay. Chrysler … Read More


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