Question about 1999 Pontiac Bonneville

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What will cause a 1999 Pontiac Bonnieville 3800 V6 that runs good when cold and fans operate normally after it gets hot (200 Degrees) not restart? The operation temp is150 Degree running on highway ,Stop and go traffic temp goes up to 200 Degrees,stall out sometimes.Won't restart after car gets hot 200+degrees.Let car sit and cool down to 150 then starts rough but runs and smothes out .

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  • Pontiac Master
  • 1,413 Answers

Many things could be your problem
1- coolant temperature or wiring defect
2- Cooling fan not working
3- Need to retrieve any engine faulty code with a scanner.
4- With a scanner look for any data that is not normal.
See a good auto technician

Hope it helps.

Posted on Feb 22, 2019

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6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: 1999 Pontiac Firebird 3800 V6 engine

air filter dirty/bad engine ground connection/fuel not reaching injectors/loose connection on ignition system

Posted on Aug 21, 2008

  • 462 Answers

SOURCE: cooling fans will not operate

IF YOU HAVE A SCANNER, WATCH THE COOLANT TEMP. LET THE ENGINE RUN UNTIL THE FANS COME ON. IF THEY DO. THE SYSTEM IS DESIGNED TO COME ON AT AROUND 228 DEGREES.

Posted on Jul 11, 2009

  • 1 Answer

SOURCE: once the car gets to op.temp it starts to run rough

I had the same problem with my pontaic gran am se 2.4l.
The small vacuum hose near the fuel filter dry rotted,cause the car to idle and stop at red lights.

Posted on Jan 29, 2010

  • 52 Answers

SOURCE: i have a 93 firebird

Hi there, have you checked the colour of the oil in the motor, if not clear or normal and have a milky look, it sounds like the head gasket is on the way, it will still drive but the symptoms sound like the head gasket, Check the oil. Hope this will be of some help to solve the problem

Posted on Sep 26, 2010

  • 34 Answers

SOURCE: 1997 Pontiac Bonneville starting issue: My

First thing to do is replace you fuel filter, If there is a check engine light have the code read, Most parts store will do this for free. Get the code number type that into google for further advise.

Posted on Oct 30, 2010

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What is the typical temperature reading for a 99 Pontiac Grand Am gt?? Im not used to V6 and wondering if I should worry about where it sits... Getting ready for a long road trip next weekend.


the fan kicks on at about 212 degrees, it should run about 195 to 200 degrees. if its hotter then this you have to change the thermostat. I have a 3.1 v6 and it runs a line or two past the half, all warmed up. hope this helps!!

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The fans are controlled by the ECM.they will not normally come on untill about 235 degrees.Have someone put a scan tool on your car,run it and see how hot it gets.Your new engine may a different coolant sensor, which changed the reading on your gauge.

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The blower motor and AC works but the heater doesn't in a 2002 bonnieville Pontiac. I turn on the AC and it works fine. I switch over to the heat and it just blows cold air.


if your vehicle has the electronic climate control, it is probably the blend door motor/actuator that has failed and is stuck at the temp that was last entered in the climate control unit when it failed. this can be a very time consuming repair to do as it is under the dash. the other possibility is your coolant level is low and not allowing the heater core to bring the outside air up to the temp you want. if that is the case,your low coolant temp sensor should have come on. if not, then the thermostat could be either stuck open or closed. if stuck open the engine would not always show the temp gauge at normal operating temp of 195-200 degrees. if stuck closed the engine should be overheating according to the temp gauge. you did not mention what the operating coolant temp was!

Oct 14, 2009 | 2002 Pontiac Bonneville

1 Answer

The car(pontiac firebird 3800 v6)overheats and


Check to make sure the radiator fan is coming on watch it for ten minute as it runs it should come on if it doesn't replace the fan relay or the fan coolant temp senson located on engine block upper area of engine.

Jul 14, 2009 | 1999 Pontiac Firebird

1 Answer

Cooling fans will not operate


IF YOU HAVE A SCANNER, WATCH THE COOLANT TEMP. LET THE ENGINE RUN UNTIL THE FANS COME ON. IF THEY DO. THE SYSTEM IS DESIGNED TO COME ON AT AROUND 228 DEGREES.

Jul 10, 2009 | 2004 Pontiac Grand Am

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