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Lurch
Lurch, Aftermarket & Factory Electronics
Category: Car
Satisfied Customers: 21013
Experience:  Ford, Chev Cert, Heavy Line Mech, Mobile Electronics.Sales, Installation & Repair for 30 years.
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93 grand am: the cooling fan relay &temp switch..ac..temp switch

Customer Question

on my 93 grand am i replaced the cooling fan relay &temp switch the only way it comes on is to turn on the ac or unplug it from the temp switch . why wont it come on when it gets over 205
Submitted: 9 years ago.
Category: Car
Expert:  Lurch replied 9 years ago.

The cooling fan should come on after the thermostat opens but before the engine overheats.

The coolant fan will be "ON" when:

  • Coolant Temperature sensor signal indicating a temperature greater than 223°F.
  • A/C is requested and vehicle speed less than 35 mph.

The coolant fan will be "ON" regardless of vehicle speed when:

  • Coolant temperature sensor faults, Code 14 or 15 are present, or any fault code that is presently causing the "SERVICE ENGINE SOON" light to be "ON."
  • Coolant Temperature sensor signal indicating a temperature greater than 239°F-244°F.
  • A/C pressure sensor indicates overpressure.

The coolant fans may remain "ON" up to 7 minutes after engine has been shut "OFF."

Customer: replied 9 years ago.
Reply to Lurch's Post: no service light is on turn off car it overheats no fan
Expert:  Lurch replied 9 years ago.

Fan won't come on after vehicle is turned off. It will stay on once it is activated when running.

You need to check Temperature prior to shuting it off, to be sure it is above 223.
Also, if you have a voltage meter, check to see if Temperature Sender is sending signal to Fan Relay

Overflow can be caused from pressure in the system (Exhaust), bad Radiator Cap, Thermostat stuck or closed, etc.

Customer: replied 9 years ago.
what abought the computer
Expert:  Lurch replied 9 years ago.
Unlikely the Computer would be at fault, unless you have other issues
Customer: replied 9 years ago.
replaced computer fixed the cooling fans they work fine now
Expert:  Lurch replied 9 years ago.

way to go...

Thanks for the update