1992 Corolla/Prism - Toyota Nation Forum : Toyota Car and Truck Forums

bren611 · 09-20-2011, 12:24 PM

Hi, I've got a 1992 Geo Prism/ Toyota Corolla. Cooling fan runs constantly until car it shut off. Having trouble finding a two prong switch for the cooling fan that screws into bottom of radiator. All sources I have found offer a one wire one prong switch that is NOT compatable with the plug I have on this car. I need one with a two prong switch. Been to all locals part stores(Advance Auto, Napa, Rock Auto. etc.) with no luck. Any help would be much appreciated.

90 GP · 09-20-2011, 04:41 PM

Did you remove part and look for a part number and do an internet search on it? Otherwise check GM or Toy parts dept.

blb · 09-23-2011, 07:54 AM

The cooling fans will run constantly as a fail safe measure if the fan wiring is messed up or a connector is corroded. Look for a connector for the cooling fan below the battery tray. Pull it apart, clean the contacts, and chances are the system will be restored to normal. A bad connection to the coolant temp sensor will also cause the fan to run all the time.

bren611 · 09-29-2011, 11:19 AM

Found this switch by removing it and looking at pictures online of similar switches. This switch is NOT listed for a Geo Prism anywhere that I can find. It is listed as one for a 1986-88 Toyota Tercel, 1990-91 Lexus LS400 and mid to late 80's Celicas. It does make some sense being that these are all still Toyota products. Thanks for the response.

blb · 09-29-2011, 03:02 PM

On your car, the computer turns the fan on and off. There is a relay under the hood, but the most likely issue is either the coolant temp sensor connection (near the thermostat) or the wiring harness connector below the battery tray that I described above.