Coolant Fan Problem

[JHynes]

CAR OVERHEATS BECAUSE THE FANS WONT TURN ON.

CHANGED RELAY, NOW COULD COMMAND THEM ON WITH SCAN TOOL.

CHANGED THERMOSTAT NOW THE MOTOR IS CIRCULATING GOOD.

CHANGED TEMP SENSOR NO CHANGE FANS STILL WON'T TURN ON

CHANGED FANS DUE TO ALLDATA DIAGNOSTICS - NO CHANGE?

ANY IDEAS PLEASE HELP???????

[xeroinfinity]

What year are you talkin about ??

[JHynes]

Sorry my bad

1999 Grand Am SE 3.4 Liter V6 with Auto Trans

[xeroinfinity]

Is it realy overheating or is it just getting hot ?

I'd say you probly have a bad lower intake gasket or head gasket.

Here are the operating conditions for the fans...

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.

[JHynes]

Fans didnt turn on at 225 Degrees F, what else do you think?

[JHynes]

thet did turn on at 226 and found a huge air pocket in it, seems to be fine now.