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Radiator fan 'switch on' temp higher for '99 996?


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I realize that information from the Carrera service manual indicates the low speed radiator fans should come on at 96.75c and high speed at 102c, but measuring mine appears to show the low speeds coming on at 100c (measured by ECTS in Durametric V6) rather than 96.75c.

The #24 post in this thread appears to show that early carreras might switch at 100 (low) and 105 (high) but I've not seen this any where else.

http://www.renntech.org/forums/topic/33858-overheating/page-2?hl=%20high%20%20low%20%20fan%20%20temperature%20%20dme

My question is: could the engine temperature sensor be a different (possibly now updated) part number from the 2002- cars?

I can't think of another good reason for mine switching on at 100c rather than 96.7c...

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I realize that information from the Carrera service manual indicates the low speed radiator fans should come on at 96.75c and high speed at 102c, but measuring mine appears to show the low speeds coming on at 100c (measured by ECTS in Durametric V6) rather than 96.75c.

The #24 post in this thread appears to show that early carreras might switch at 100 (low) and 105 (high) but I've not seen this any where else.

http://www.renntech.org/forums/topic/33858-overheating/page-2?hl=%20high%20%20low%20%20fan%20%20temperature%20%20dme

My question is: could the engine temperature sensor be a different (possibly now updated) part number from the 2002- cars?

I can't think of another good reason for mine switching on at 100c rather than 96.7c...

The temp sensors are accurate within a range of +/- a few degrees, and sometimes change a bit with age. The fans are triggered by the DME, so there also can be some variance there. What you are seeing is normal behavior,

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