Running Hot
rkuchar1
10-11-2007, 07:55 PM
I have a question about my car
1999 Pontiac Grand AM SE
3.4 L
Driving on the highway it runs normal.
Driving in the city it starts to over heat.
I have replaced the water pumper, thermostat.
1999 Pontiac Grand AM SE
3.4 L
Driving on the highway it runs normal.
Driving in the city it starts to over heat.
I have replaced the water pumper, thermostat.
Jmoney3318
10-11-2007, 07:59 PM
over heat temperature is at what when driving in the city?
Theessence
10-11-2007, 09:26 PM
I guess it depends by what you mean by "overheating". If you mean its just hotter then I believe that's normal.
Do you drive it harder or go WOT when you're in the city? The more often your rpms are high I can imagine the engine getting a lot hotter than cruisin at 2k rpms on highway.
Do you drive it harder or go WOT when you're in the city? The more often your rpms are high I can imagine the engine getting a lot hotter than cruisin at 2k rpms on highway.
dlwdkh
10-12-2007, 11:12 AM
These cars are hard on radiators. Flush the engine good. Install new antifreeze and distilled water. If it still has problems and has more than 100k you should consider a radiator.
xeroinfinity
10-12-2007, 04:15 PM
Usually when a car overheats in city when it doesnt on highways is a sign thiers flow issues.
Like dlwdkh said, flush your cooling system.
That should take care of the higher temps in the city.
If not then you could have a LIM gasket going bad.
Cooling fans run commands....
The PCM commands Low Speed Fans ON under the following conditions:
The engine coolant temperature exceeds approximately 106°C (223°F).
The A/C refrigerant pressure exceeds 1310 kPa (190 psi).
The vehicle is shut off when the engine coolant temperature is greater than 140°C (284°F) and system voltage is more than 12 volts. The fans will stay ON for approximately 3 minutes.
The PCM commands High Speed Fans on under the following conditions:
The engine coolant temperature reaches 110°C (230°F).
The A/C refrigerant pressure exceeds 1655 kPa (240 psi).
When certain DTCs set.
Like dlwdkh said, flush your cooling system.
That should take care of the higher temps in the city.
If not then you could have a LIM gasket going bad.
Cooling fans run commands....
The PCM commands Low Speed Fans ON under the following conditions:
The engine coolant temperature exceeds approximately 106°C (223°F).
The A/C refrigerant pressure exceeds 1310 kPa (190 psi).
The vehicle is shut off when the engine coolant temperature is greater than 140°C (284°F) and system voltage is more than 12 volts. The fans will stay ON for approximately 3 minutes.
The PCM commands High Speed Fans on under the following conditions:
The engine coolant temperature reaches 110°C (230°F).
The A/C refrigerant pressure exceeds 1655 kPa (240 psi).
When certain DTCs set.
inafogg
10-12-2007, 04:25 PM
hello are the cooling fans working??
rkuchar1
10-23-2007, 04:01 PM
Sorry about the delay. My Computer has been down and this is the first time I had a chance to reply.
It runs above 90 degrees then actually starts to overheat, going to red....
I wouyld say about 1 hr of driving will do this...Just city driving, basically @ 50km/h
It runs above 90 degrees then actually starts to overheat, going to red....
I wouyld say about 1 hr of driving will do this...Just city driving, basically @ 50km/h
powermaster
10-23-2007, 04:03 PM
Have you verified cooling fans working?
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