Question about Pontiac Grand Am

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How to repair over heating problem on 1999 grand am

No coolant getting to heater core,has to much air in system, causing to over heat

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  • 133 Answers

Change thirmostat and refillcooling system look for bleed niples on the heater hose's and coolent pipes and on th top of radiator if it has an expantion bottle then remove and hold up higher than the cooling system and fill that way

Posted on Dec 30, 2013

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Posted on Jan 02, 2017

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blueextc3221
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SOURCE: cooling system bleeding

Faulty thermostat or water pump.

Posted on Jan 03, 2009

  • 4 Answers

SOURCE: 1999 Ford Windstar 3.8 no heat

If you have a knock or clicking noise behind the radio, it is the blend motor. The blend door is spring loaded and the gears in the blend motor are "stripped". The door is spring loaded so that the door is closed to the heater core. About 2 hours to replace and a lot of bending and stretching. You don't have to remove the dash, but all of the trim, radio, and controls will need to come out.

Posted on Mar 01, 2009

cj2176
  • 520 Answers

SOURCE: Prizm overheats, heater core leaks, no heat

You can bypass the core or fix it that's up to you but I would change or remove the thermostat first. If it still overheats then start looking at the water pump and radiator. Hope this helps. Good luck.

Posted on Jun 09, 2009

  • 172 Answers

SOURCE: Im getting no heat in my 1999 Pontiac Grand Am, I

Put your heater temperature control in the max position on(this opens the valve for coolant flow through the heater core). Top off the radiator and the coolant resevoir. Make sure the cap is on tight and bring the engine up to operating temperature. Shut off engine, allow to cool, and top off the radiator again. Repeat these steps until you are sure it will not take anymore coolant. Drive the car at speed for 5 or 10 miles and recheck again when cool. It takes awhile to work air out of the system with multiple openings of the thermostat.

Posted on Jan 04, 2010

  • 172 Answers

SOURCE: plenty of air but no heat

Check to see that the blend door linkage is hooked up. Doubtful it is heater core, as you had heat to one side and not the other. Check coolant control valve linkage, verify it is moving the coolant valve from off to on when you switch temperature from cold to hot. Verify you have coolant flow to the heater core by feeling the heater hoses where they enter the firewall. If all checks out well, then look at hvac controls individually.

Posted on Jan 06, 2010

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2 Answers

I changed the thermostat but it still does not heat up what else could be wrong


Heater needs Heater Core, Heater control valve, air diverter inside the car and hot water in the heater core. If you just change the thermostat you must have had a reason. If the car was running hot it could be a radiator clog. If the core is clogged no heat. If the heater core was drained when you changed the Tstat there may be air in it - if so no heat. If the control valve (on the heater hose) does not shift- no heat. If the diverter door in under the dash does not direct the fan air through the heater core- no heat.

Jan 03, 2016 | Cars & Trucks

1 Answer

No heat in 1999 sunfire


This can be a few things, for starters most common in my experience is when you have air bubbles in the coolant system (Mostly when its been recently drained or flushed) You will have no heat. Also, if your heater core has failed (in most cases water will leak from under your dash) you will loose heat and your vehicle will most likely overheat. Last but certainly not least, a failing head gasket could cause combustion to leak into your coolant system causing air bubbles which could make your heater not work which could also cause overheating in further along failing head gaskets. Things to check would be a leaking heater core under the dash, overheating, check engine lights and bleeding the coolant system.

Feb 22, 2014 | Pontiac Sunfire Cars & Trucks

1 Answer

Heat not working


Sounds like the air blend door is not opening to let heat in.

Engine coolant is provided to the heater system by two 16 mm (5/8 inch inside diameter) heater hoses. With the engine idling at normal running temperature, set the heater-A/C controls as follows. Temperature control to full Heat, Mode control to Floor, Blower control to the highest speed setting. Using a test thermometer, check the air temperature coming from the center floor outlets and compare this reading to the Temperature Reference table.

If the floor outlet air temperature is insufficient, check that the cooling system is operating to specifications. Both heater hoses should be HOT to the touch (the coolant return hose should be slightly cooler than the supply hose). If the coolant return hose is much cooler than the supply hose, locate and repair the engine coolant flow obstruction in heater system.

POSSIBLE LOCATIONS OR CAUSE OF OBSTRUCTED COOLANT FLOW
If coolant flow is verified and the heater floor outlet temperature is insufficient, a mechanical problem may exist.

POSSIBLE LOCATION OR CAUSE OF INSUFFICIENT HEAT
  • Obstructed cowl air intake.
  • Obstructed heater system outlets.
  • Blend-air door not functioning properly.
TEMPERATURE CONTROL
If heater floor outlet temperature cannot be adjusted with the heater-A/C control temperature control lever, one of the following could require service:

Jan 21, 2014 | Cars & Trucks

1 Answer

1999 Dodge Grand Caravan heat is cold


There are two possibilities, one is the thermostat. Many people remove them which spoils the whole heating / cooling system. Since you changed the thermostat, I would check the heater valve on the heater which allows the hot water to circulate through the heating system.
It may be necessary to remove the heater box and flush the heater core since you talk about a lot of rust, which could have clogged the heater core and / or the pipes leading to the heater.

Aug 29, 2017 | 1999 Dodge Grand Caravan

1 Answer

No heat from blowerbut temp guage says normal what is wrong?


This can be caused by a bad heater core. The heater core provides heat from the motors coolant system and transfers it to heat. Then the blower motor takes that heat and blows it into the van. Another possibility is that the cold/warm blender doors that direct the air flow can get stuck in one position.

Jan 06, 2011 | 1999 Ford Windstar

1 Answer

Heat stops working. No heat from heater on my 1999 S10 V6.. I have "burped the cooling system after which I get plenty of heat but eventually it stop working after driving 2-3 days. Should the heater...


Air is getting into the system. Tighten all hoses and do not overlook the hose going to the expansion tank. When car cools that hose sucks water back into system but if not tight it will suck in air. Could be why you constantly have to "burp" the system.

Jun 13, 2017 | 1999 Chevrolet S-10 Pickup

1 Answer

Im getting no heat in my 1999 Pontiac Grand Am, I just replaced the lower and upper in take gaskets due to them leaking and the thermostat, I have bleed the system numerous times and I was told that I have...


Put your heater temperature control in the max position on(this opens the valve for coolant flow through the heater core). Top off the radiator and the coolant resevoir. Make sure the cap is on tight and bring the engine up to operating temperature. Shut off engine, allow to cool, and top off the radiator again. Repeat these steps until you are sure it will not take anymore coolant. Drive the car at speed for 5 or 10 miles and recheck again when cool. It takes awhile to work air out of the system with multiple openings of the thermostat.

Jan 04, 2010 | 1999 Pontiac Grand Am GT

1 Answer

Does not blow hot air (heat)


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

To attempt to clean the core, you must flush the system multiple times. If this does not work, the core cannot be cleaned and must be replaced.

Jan 16, 2009 | 1995 Jeep Grand Cherokee

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