Question about 1996 Pontiac Grand Am

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My temperature gauge gets really high almost to the boiling point, but when I turn on the heater in the car cool air comes out. Then the gauge will slowly come down. Also, when I shut the car off the cooling fan seems to run longer. It use to almost never run with the car off.

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  • 39 Answers

Does the cooling system have enough coolant?(don't remove radiator cap when coolant is HOT!) If not check for a leak. Thermostat could be stuck closed.

Posted on Nov 11, 2010

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Posted on Jan 02, 2017

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2 Answers

If i just put water and no coolant could this make my car over heat


No your car will not overheat, but it is advisable to my 50% coolant on the water to prevent deposits of rust and other debris that may affect the effectiveness of the cooling system.

Mar 26, 2017 | Cars & Trucks

1 Answer

Erratic temp gauge - strong smell of antifreeze - temp light comes on flickers goes out. really hot air coming through heater vents.


have the alternator checked for out put. have a pressure test done on the cooling system to check for leaks The fluctuating temp gauge may be the boiling water gushing past the sender bulb .

Mar 02, 2014 | Buick Century Cars & Trucks

2 Answers

Is it normal on 94 grand prix 3.1 for the temp. gauge to NOT stay at a steady temp. all the time? mine seems to go up to 210 at a stop light then go back down after i start rollin again, i just had air...


Have you checked your cooling fan to see if it is working propely? Let the car idle and get warm and listen for the fan to kick in (if they are electric) or just watch to see if the fan starts to spin faster if it is the old school type with a clutch. Have you replaced the thermostat? A bad one will let the temp rise since it opens too late and then the temp will drop off. But it won't due this only at a light and it will do it infrequently.

Apr 18, 2013 | 1994 Pontiac Grand Prix

3 Answers

Why does my antifreeze just bubble a little when i have my heater turned off on my civic


Do a combustion leak test at the coolant cap for
exhaust gases

Need to be sure your not loosing coolant & have no
air in the system

Feb 01, 2013 | 1997 Honda Civic

1 Answer

My 1999 Chevy Malibu runs hot? It started when it overheated. We changed the thermostat, then water pump, then temp sensor gauge and the temp gauge goes high but only when the heater stops blowing hot...


Air pockets will make the guage do that, and also cause your heat to come and go. Also, a poor radiator, as in rotting, or plugged up, will cause high temperature issues.

Sep 20, 2011 | 1999 Chevrolet Malibu

2 Answers

Removed my thermostat and tested it in boiling water and it was opening correctly so I re-installed it. After that the water in the radiator boils, and move to the reserve tank, without the electric fans...


your cooling sustem is airbound.i suspect you have little or no warm air coming out of heater.while filling with engine running remove outlet heater hosefrom heater core.this alone will purge 90% of air from system.

Jan 21, 2011 | 2001 Nissan Sentra

2 Answers

The coolant in the reservoir boils out of vent tube and overheats the engine. The temp gauge also dropped to C instead of going to H when this took place. Is this syptomatic of a water pump failure,...


Refill the coolant system reservoir when cold. Ensure the cap has a good seal and is tightened down properly With the hood raised, restart and allow the engine to idle until running temperature. 1) No agitation should be seen in the reservoir water, certainly no stream of bubbles or violent movement. If there are violent signs then this points to a blown head gasket. 2) The top rubber hose from the engine to the radiator at some point should become hot. Keeping checking the temperature gauge from time to time to see if the temperature is rising. If there is no temperature gauge response then there is something wrong with the gauge circuitry. 3) at some point here the fan (if electric or clutch operated should become engaged. If the electric fan never comes on either the temperature sensor is faulty, the fan fuse or solenoid relay are not functional or the fan motor is blown. 4) Within a few more minutes the lower hose exiting from radiator to the engine should also become hot. If these two events happen then your pump is circulating the water and the thermostat is functioning.If the top hose does not become hot you need to check your thermostat. If the top hose does become hot but the bottom one does not, even after quite a while, then either the pump is a fault or there is blockage; maybe due to sludge in the radiator core or pipes. To check the thermostat simply remove it and drop it into a pan of boiling water. Immediately you should see the thermostat pop open. Take the pan of water off the heat and watch the thermostat. After about five minutes when the water has begum to cool the thermostat should pop closed again. These events are not subtle so if they are not seen it is likely that a new thermostat will be needed. In the event the system is blocked simply remove coolant hoses and use a high pressure hose to flush the radiator and system clear of sludge. If there is air trapped in the system try putting the interior heater on to full to help flush them out. In an emergency putting on the interior heater can assist the main engine cooling.

Jun 20, 2010 | 1994 Chrysler Concorde

1 Answer

My 2001 lincoin ls gauge goes up to the h and then come back down


you probably have air trapped in the system. Have dealer or radiator shop bleed system.

I assume your cooling fan is working.

what engine v6 or v8?

SECTION 303-03: Engine Cooling 2001 Lincoln LS Workshop Manual
DESCRIPTION AND OPERATION Engine Cooling The cooling system components include the:
  • block heater (optional)
  • cylinder head temperature sensor
  • fan blade, fan motor and fan shroud assembly
  • radiator
  • pressure relief cap
  • degas bottle
  • radiator draincock
  • water pump
  • oil cooler (optional)
  • water thermostat
The water thermostat:
  • controls the engine coolant temperature.
  • allows quicker engine warm-up.
The degas bottle:
  • provides a location for system fill.
  • contains coolant expansion and system pressurization.
  • provides air separation during operation.
  • replenishes the engine coolant to the system.
The fan blade draws air through the radiator to help cool the engine coolant.
The fan motor:
  • operates only when the engine is running.
  • will not operate when the engine is off.
The engine coolant flows:
  • from the lower radiator hose to the water pump.
  • from the water pump to the engine block and the cylinder heads.
A closed water thermostat returns the engine coolant to the water pump. An open water thermostat allows the engine coolant to flow to the radiator.
Unsatisfactory coolant materials:
  • Alcohol-type antifreeze does not provide adequate water pump lubrication.
    • has lower boiling point
    • reduced antifreeze protection
  • Alkaline brine solutions will cause serious engine cooling system damage.
The cylinder head temperature sensor provides a signal to the temperature gauge.
  • will invoke failsafe cooling.
The optional block heater:
  • electrical heating element is installed in the block cooling jacket.
    • uses a standard 110V (220V in Europe) electrical supply
  • keeps the engine coolant warm during cold weather.
The auxiliary water pump (3.9L only):
  • provides heater coolant flow boost.
  • has a secondary function of providing engine-off cooling.

May 01, 2009 | 2001 Lincoln LS

2 Answers

My 1986 plymouth turismo runs hot and overheats


You say it gets hot and overheats, are you losing coolant when it overheats? If it isn't boiling over, you seemed to cover everything that could be wrong, the fan is working, if it is not boiling over, just registering hot on the gauge, I wonder if it's just a temp. sending unit that's bad, indicating a overheating problem when there really isn't one. The water pump is bad when the shaft bearings go bad, and it will leak at that point. So, let me know if the car is actually boiling over (steam visible, exiting the cooling system)

Apr 14, 2009 | 1986 Plymouth Conquest

1 Answer

Hello, My 1992 Cadillac Seville has not been blowing heat for about one week. We replaced the thermostat and that did not work. Yesterday my car became really sluggish and started to overheat. The...


Help is HERE!
It looks like an Air lock scenario!
Park vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater to hot blower on full. When at operating temp keep clear of coolant filler area and listen, hopefully gurgling then a boil over, wait and then top up with very warm water/coolant let settle it may boil over again whilst air is still in system.
Check for heat inside car, if hot and coolant settled replace cap but keep an eye on temp gauge for a while as air lock may still be further along cooling system.
Please press the Blue button if sorted!
Paul 'W' U.K.

Jan 28, 2009 | 1994 Cadillac DeVille

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