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Unread 04-15-2013   #1 (permalink)
joshaiken is offline Rookie


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Default 97 mustang gt overheating

i have a 97 gt and i replaced the water pump and the themostat and radiator fan but the temp guage keeps going all the way to the h. The temp will then go back down to the normal range and will do the same thing over again under normal driving i was wondering if anyone had any suggestions on how to fix this issue thanks in advance
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Unread 04-15-2013   #2 (permalink)
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Is the cooling fan operating properly - as in, does it come on at like 180-190 or so, or does it not come on until the gauge reading indicates a near overheating condition? Also verify that it comes on when a/c or defroster is on; it should stay on constantly when the a/c compressor is running.

The second one is what it sounds like may be happening.
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Unread 04-15-2013   #3 (permalink)
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Check that the fan works on both high AND low speed. Sounds like the low speed fan is NOT working. Easy enough to confirm by running the fan directly from battery. There should be an obvious difference between the low and high speed.

Remember for the GT, the low speed fan runs when the AC is on. The high speed fan runs when the motor temp rises above the HS fan set point or the AC high head pressure switch is tripped.
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Unread 04-15-2013   #4 (permalink)
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Dont mean to hijack here, but what set temp does the pcm turn on the low speed?
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Unread 04-16-2013   #5 (permalink)
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I believe it is 200-210 low and 225-230 high. Something close to that
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