Cooling Fans don't turn on. (Cadillac Seville STS 94')
Hello !
First of all thanks to those who help many people on this forum. I have a problem on my Cad Seville STS 1994. Cooling fans (small and high speed) no longer work when the automatic box heats up too much and the engine temperature exceeds 95 ° C (203 ° F) I changed the thermostat, temperature sensor, checked the relays of the fans and fuses, checked the water pump and all that is ok. I do not have a permanent code just from the historical ones that are no longer. I am overwhelmed and can not find the problem :(:confused: !!! Can you help me please !!!!! Jonathan, |
Cooling fans should come on with A/C or when engine temp reaches 226* and will quit approx. 210*. Codes should set if there is a fan failure. Typical engine operating temperature range is 190-215 and possibly up to 230 in stop and go traffic in 90*+ weather.
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Thanks for your slowroll response. I tried with A / C and no fans worked. I let the engine temperature rise to 224 ° F (107 ° C) and the fans did not work.
The low speed of the fan must also activate when the automatic transmission fluid is too hot but the latter does not lock. I remember before the low-speed fan snapped around 185 ° F (85 ° C) to cool the automatic gearbox fluid and the high speed at 204 ° F (96 ° C). I am afraid to make a cylinder head gasket by letting it rise in temperature. P.S: If I put A / C on cold, should the fan start after 2 seconds or wait longer? Thank you in advance... |
Also I disconnected the battery for 3 months and when I reconnected it I launched the
computer on board to see the error codes following the reconnection of the battery. But after making a clear codes I have that history |
After all this period without battery, do you have to do a reprogramming
for the PCM / ECM? |
No programming required, however Idle maybe a little off for the first few times you drive car until idle is learned. you may or may not notice it. car has on-board functions as well as OBD. Get the 2 volume FSM and there will be info to fix most things without going to dealer or service shop. It is possible to use the override features to check fan operation.
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Thanks slowroll for the lights.
I will take the 2 FSM and see if I find my happiness. In France the garages are not friendly and do not want to do a test with OBD. And even a garage that sells American cars does not want so I have to fend for myself ... If I find the breakdown I would come back to inform but it may take time ... Otherwise I think the PCM / ECM is HS but without OBD ... Finally ... See you soon, |
Even in the states there are people who don't want to deal with pre 1996 cadillacs. Good Luck!
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Hello !
Slowroll I turned on the air conditioner to see if one of the two fans was activated but nothing and after the temperature exceeded 222.8 ° F (106 ° C) the low speed is switched on !! I still cut the cilm to see if the fan would still turn and it turns. When it was stopped the temperature was 212 ° F (100 ° C) and I let the temperature go up to see if the fan would go off without the A / C mode and it would turn !! You were right and I thank you greatly :-) !! Good day and thanks again for your advices :-) :-) !!! |
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