ENGINE

DYLANV

MEMBER
1999 PONTIAC GRAND AM
4 CYL
FWD
AUTOMATIC
170,000 MILES

Engine over heats, while driving and at stand still especially. Fuses for Radiator fan are good. Coolant levels perfect. No leaks. Thermostat? Or Fan Motors?

Sunday, February 27th, 2011 AT 7:08 PM

5 Replies

WRENCHTECH

MECHANIC
20,761 POSTS

Does the fan come on when the A/C is turned on?
How high has the temp gone to?

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Sunday, February 27th, 2011 AT 7:59 PM

DYLANV

MEMBER
6 POSTS

The fans do not come on when the A/C is selected. It heats up slightly, maybe 220 degrees Fahrenheit.

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Sunday, February 27th, 2011 AT 8:03 PM

WRENCHTECH

MECHANIC
20,761 POSTS

This is a 2 speed fan system and low speed isn't even programmed to come on until approx 223 degrees. You could have a problem with the low speed circuit and high speed wouldn't kick until around 230.

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Sunday, February 27th, 2011 AT 8:11 PM

DYLANV

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6 POSTS

Should I go ahead and replace the Thermostat? What do I look for that might cause the over-heating?

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Sunday, February 27th, 2011 AT 8:18 PM

WRENCHTECH

MECHANIC
20,761 POSTS

Check the coolant level and pressure test the system. If it only overheats when stopped or going slow, then concentrate on the fan circuit. If it overheats at highways speeds, there are many possibilities.