Question about 2002 Pontiac Grand Prix

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Overheating and heater not work

When i start my car to defrost my windshield the temperature gauge rises above 210 and blows out cold air, but when i drive down the highway the temperature drop back down to about 180 and the heater starts to work. Then when i stop at a stop light the temperature rises again and starts to blow out cold air again. What could the problem be?

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  • dustin_66215 Dec 02, 2008

    I have the same problem and I have changed the thermostat and my coolant level is full.

  • dustin_66215 Dec 05, 2008

    I replaced the thermostat last winter and the coolant level is full. By the way I want to think you for answering my questions.

  • Anonymous Feb 05, 2009

    my car doing da same thang

  • Anonymous Mar 18, 2014

    Windshield defroster stopped blowing

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There is a valve on the water pump and one on the thermostat housing open those up one at a time until you get a little bit of antifreeze come out then tighten them back up. All you will be doing is bleeding the air out of the cooling system. my car was doing the same thing after I changed my thermostat.

Posted on Dec 12, 2008

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A bad thermostat. check coolant level also

Posted on Nov 16, 2008

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2000 dodge stratus. Heater only works at idle, when driving at high speeds, heater blows cold and thermostat gauge goes to cold. Back flushed heater core, new thermostat any ideas?


I'd say you have a faulty thermostat, be it new or not. If your temperature gauge goes to cold as your engine is taking you down the highway, the thermostat is not doing its job. The temperature should never come down to below normal until engine is shut off...

Dec 03, 2013 | 2000 Dodge Stratus

Tip

Tips for operating Air conditioning system on Toyota Hilux and someother...


To cool off your Toyota after it has been parked in the hot sun, drive with the windows open for a few minutes. This vents the hot air, allowing the air conditioning to cool the interior more quickly.

Make sure the air intake grilles in front of the windshield are not blocked (by leaves or snow, for example).

On humid, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

Keep the area under the front seats clear to allow air to circulate throughout the vehicle.

On cold days, set the fan speed to high for a minute to help clear the intake ducts of snow or moisture. This can reduce the amount of fogging on the windows.

When driving on dusty roads, close all windows. If dust thrown up b the vehicle is still drawn into the vehicle after closing the windows, it is recommended that the in intake be set to FRESH and the fan speed to any setting except "OFF".

If following another vehicle on a dusty road, or driving in windy and dusty conditions, it is recommended that the air intake be temporarily set to RECIRCULATE, which will close off the outside passage and prevent outside air and dust from entering the vehicle interior.

HEATING

For best results, set controls to;
Fan speed ---- Any setting except "OFF"
Temperature----Towards WARM (red zone)
Air intake ---- FRESH (outside air)
Air flow ---- FLOOR
Air conditioning ---- OFF

For quick heating, select recirculated air for a few minutes. To keep the windows from fogging, select fresh after the vehicle has been warmed.

Press the "A/C" button on for dehumidified heating.

Choose floor/windshield air flow to heat the voltage interior while defrosting or defogging the windshield.

AIR CONDITIONING

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

For quick cooling, move the air intake selector to recirculate for a few minutes.

VENTILATION

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

DEFOGGING

The inside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone) to heat; COLD (blue zone) to cool
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- ON

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

On humid days, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

DEFROSTING

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

To heat the vehicle interior while defrosting the windshield, choose floor/windshield air flow.

on Feb 14, 2011 | Toyota Pickup Cars & Trucks

1 Answer

My 2009 Peugeot 308's heating is baffling me when i drive at normal speeds say 30 and above the engine temperature gauge never rises and the heater doesnt work but when im in traffic or parked with th


Thermostat may not be working properly, hot coolant has to circulate via the heater core in order to get heat. Normally operation temperation should be 180 to 200 degrees.

Nov 21, 2013 | Peugeot 308 Cars & Trucks

2 Answers

Air pockets in radiator


Air can be purged. While your engine is cool remove radiator and reservoir caps. Place funnel in radiator. Turn heat to the highest position and start vehicle. Add coolant to radiator as needed while vehicle warms up. You should see bubbles coming out of radiator. Fill reservoir to between cold and hot fill lines. Replace caps when bubbling stops but before coolant temperature reaches normal operating temperature. Never remove the radiator cap until engine has fully cooled down.

Jan 15, 2013 | 2008 Nissan Frontier

1 Answer

2002 gmc van overheatig


It has a leak. Fill up the radiator and the coolant tank. Then restart it and check for leaks.

Mar 13, 2009 | 2002 GMC Savana

1 Answer

2004 Tahoe Heater Problem


check coolant level ,must be low ,chck for coolant loss

Mar 04, 2009 | 2004 Chevrolet Tahoe

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Intermitant temperature


Check to make sure your thermostat works right by monitoring the warming up of your engine. With a completely cold engine, start and run the engine for a few minutes, then put your hand on the top radiator hose to monitor if and when it gets warm as the thermostat opens more and more and note the gauge reading( if it works) the top radiator hose should be unbearably hot within 5-8 minutes. If the therm. opens right it should close right aswell, staying open a little while eventhough the radiator may have cooled may be what you are experiencing causing the rapid cooling and is nothing to worry about. The Hose should not get warm very soon after starting the engine. Regarding you gauge, lets take one step at a time, verify proper op. or the therm.

Jan 20, 2009 | 1986 Toyota 4Runner

1 Answer

COLD AIR BLOWING THROUGH HEATER


I DON'T IT'S THE THERMOSTAT, BECAUSE I HAD THE SAME PROBLEM, COME TO FIND OUT IT WAS MY BYPASS HOSE BEHIND THE ENGINE THAT WAS LICKING THE COOLANT. CHECK COOLANT RESEVOIR.

Nov 18, 2008 | 2000 Daewoo Leganza

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