Question about 1997 Pontiac Grand Prix

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My 97 Grand Prix is having radiator cooling fan problems. I know that one fan is to come on when it reaches a certain temperature and the other for when the a/c is turned on. I disconnected the fans and jumped them to the battery and both fans work. So I know it is not a fan problem or fuses. My question is, are the three relays under the hood prone to breaking or how do I go about figuring out what the problem is?

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  • Master
  • 564 Answers

Could be temp senders,,,hook up scanner & watch temp out puts to see if they are working

Posted on Feb 01, 2010

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How to remove and replace the radiator on a 97 grand prix 3.8


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Jul 06, 2012 | 1997 Pontiac Grand Prix

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Jul 22, 2011 | 1999 Pontiac Grand Prix

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2004 Pontiac Grand Prix is running warm about halfway. When I'm driving around it stays below half, but when I stop it heats up over half. then the fan turns on. Could this be a fan sensor? Is it not...


CHECK COOLANT LEVEL.IF COOLING FAN TURNING ON COOLANT TEMPERATURE SENSOR WORKING.BECAUSE IT CONTROLS AND TURN ON COOLANT FAN AT A SET TEMPERATURE.SOUND LIKE ENGINE RUNNING TOO HOT. HAVE RADIATOR FLUSHED.REPLACE THERMOSTAT. HAVE ENGINE BLOCK FLUSHED.REPLACE RADIATOR PRESSURE CAP ALSO.SEE WHAT HAPPENS.

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I have a 2005 Pontiac Grand Prix my cars fluids are all ok but its overheating. Put in a new thermostat and it is still running hot. The radiator cooling fans will not turn on where do i start?


CHECK COOLING FANS FUSE AND RELAYS.IF ALL IS GOOD PROBLEM COULD BE FAULTY COOLANT TEMPERATURE SENSOR OR FAULTY PCM OR FAULTY FAN WIRING.

Mar 31, 2011 | 2005 Pontiac Grand Prix

1 Answer

Need to replace my water pump do you have a diagram


5.3L Grand Prix Engine
  1. Place a drain pan underneath the radiator. When the engine is cool, drain the cooling system from the radiator into the pan.
  2. Remove the battery from the engine along with its tray.
  3. Take the drive belt out of the engine.
  4. Loosen and remove the three bolts to the water pump and remove the pump, throwing away the gasket.
  5. Clean the gasket mating surfaces and install the new water pump with a new gasket, tightening the bolts to 89 inch pounds (10 Nm).
  6. Reinstall the drive belt and the battery with the battery tray.
  7. Refill the engine's cooling system with coolant. Start the car and check for leaks when the engine reaches normal operating temperature.
3.5L Grand Prix Engine
  1. Partially drain the coolant from the cooling system.
  2. Disconnect the surge tank outlet hose and remove the drive belt.
  3. Remove the idler pulley and the water pump pulley, making sure to note the locations of the bolts as you remove them as they are various lengths.
  4. Loosen and remove the bolts to the water pump, also taking note at their locations, and remove the pump.
  5. Install the new water pump with a new gasket, tightening the bolts to 124 inch pounds (14 Nm).
  6. Reattach the water pump pulley, tightening the bolts to 106 inch pounds (12 Nm).
  7. Reinstall the idler pulley, tightening the bolts to 37 foot pounds (50 Nm) and install the surge tank hose and drive belt.
  8. Refill the engine's cooling system with coolant.
  9. Start the car and check for leaks when the engine reaches normal operating temperature.
3.4L and 3.1L Grand Prix Engines

  1. Place a drain pan underneath the radiator. When the engine is cool, drain the cooling system from the radiator into the pan.
  2. Disconnect the negative battery cable.
  3. Remove the accessory drive belt guard and the accessory drive belt.
  4. Loosen and remove the water pump pulley bolts and remove the water pump pulley.
  5. Remove the water pump bolts and remove the water pump.
  6. Install the new water pump along with a new gasket, tightening the bolts to 89 inch pounds (10 Nm).
  7. Reinstall the water pump pulley and tighten the bolts to 18 foot pounds (25 Nm).
  8. Reattach the accessory drive belt with the drive belt guard.
  9. Refill the engine's cooling system with coolant.
  10. Start the car and check for leaks when the engine reaches normal operating temperature.

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3 Answers

The radiator cooling fan is not working. Upon


assuming fuse and relay are good..no fan should be running when the engine is cool/cold, the only time the fan should be running when it reach over operation temperature which then the fan kick on to bring the temperature back down to it operation temperature. both fan work in sync with one another, addition cooling is needed when the ac is running. when the last time have you replace thermostat and Thermos sensor/switch. I would replace both unit if you have not done so. The thermos/switch will turn the fan on when it reach certain temperature and cut off when it sense the temperature drop in the engine.

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1 Answer

Overheating 97 V6 pontiac grand am


1 Inspect Cooling System Mix Coolant level low or flow is restricted. grey_line.gif 2 Inspect Belt Incorrectly routed, adjusted, tensioned, missing, or worn water pump belt(s). grey_line.gif 3 Inspect Oil Pan Gasket - Performance Ruptured, cracked or leaking radiator hose. grey_line.gif 4 Inspect Radiator Cap Worn or damaged radiator cap grey_line.gif 5 Inspect Thermostat Thermostat stuck closed grey_line.gif 6 Inspect Fan Blade Broken, missing, or defective fan blade(s). grey_line.gif 8 Inspect Water Pump Damaged, worn or leaking water pump. grey_line.gif 9 Inspect Intake Manifold Plenum - Perform Leaking water pump gasket. grey_line.gif 10 Inspect Cooling Fan Control Faulty cooling fan control or circuit. grey_line.gif 11 Inspect Cooling Fan Switch - Radiator Faulty radiator cooling fan switch or circuit. grey_line.gif 12 Inspect Engine Temperature Sensor Faulty engine temperature sensor or circuit. grey_line.gif 13 Inspect Temperature Switch Damaged or faulty temperature switch or temperature switch circuit. grey_line.gif 14 Inspect Fan Clutch Worn, loose or faulty fan clutch. grey_line.gif 15 Inspect Ported Vacuum Switch Damaged, leaking, or faulty ported vacuum switch. grey_line.gif 16 Inspect Radiator Obstructed radiator core or radiator cooling fins. grey_line.gif 17 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders

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