Question about 2007 Pontiac Grand Prix

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Hoses to heater core one hot one cool - 2007 Pontiac Grand Prix

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  • Pontiac Expert
  • 328 Answers

Clogged heater core get a coolant flush tee from any auto parts store install in heater hose and flush it for an hour... hopefully your heater core isn't leaking

Posted on Feb 26, 2015

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6ya6ya
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Posted on Jan 02, 2017

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james klgr
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SOURCE: 2002 montana getting overheated

sounds like a stuck thermostat. but check if the system has a bleeder screw if it does burp it and that will help also.

Posted on Dec 13, 2008

  • 55 Answers

SOURCE: little heat

you have a blokage. first try new thermastat. if that dont work you need new radiator.

Posted on Dec 06, 2009

mabpest
  • 1152 Answers

SOURCE: Have a heat problem...I had

Do you have a heater control valve.mabpest_16.jpg
.the damper door may be closed on it not allowing hot water to the heater core.
You can go to my tips "heat troubleshooting" for more info.

Posted on Feb 08, 2011

Autotroubles
  • 987 Answers

SOURCE: heater blows air on low u can feel some warmth

Heater core is blocked or choked, needs replacing.

Posted on Mar 01, 2011

  • 594 Answers

SOURCE: I replaced the heater core.

some cars like cavalier and sunbirds grand am
were the rad is lower then the motor or heater core
needs to be vacumed fill to get all the air out
otherwise very little heat in heater system even if engine temp
runs up

Posted on Mar 31, 2011

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1 Answer

The heater is blowing cold air when on hot setting, thermostat replaced?


Could be a few problems causing this. Check to see if both heater hoses are hot going into and coming out of the heater core from under the hood. If both hoses are hot then there is an issue with the blend door/s inside the heater box assembly. If only 1 hose hot at the heater core and the other hose warm/cool you most likely have a heater core restriction and a back flush will be required. If no hoses are hot at the heater core then you have air in the system or the coolant level is low

May 10, 2015 | Cars & Trucks

1 Answer

Heater not working


Feel your heater hoses. If both are hot, the heater core is circulating coolant, and the thermostat is not a problem. The door controls in the heater case need attention.
If only one heater hose is hot and the other cool, look for a water valve in the heater hoses-may be closed. Or the core has an air blockage or blockage-try to backflush it with a garden hose.
If both heater hoses are cool (on a warmed up engine), then it could be thermostat is stuck open.

Dec 01, 2013 | 2000 Mercury Grand Marquis

1 Answer

2001 VW Beetle heater not heating.


If both your heater hoses are hot, the heater core is circulating fluid. If only one is hot, and one is cool-then the core is plugged or has an air block, or a valve in the heater line is closed if that applies.
If the engine stays at normal operating temperature, doesn't overheat at all, there should not be a problem with the water pump.

The problem may be with the doors in the heater case not operating properly.

Nov 26, 2013 | Cars & Trucks

1 Answer

My S reg ford escort diesel only blows cold air or very luke warm air can you help?


CHECK FOR LOW COOLANT,NOT ENOUGH COOLANT IN THE SYSTEM.IF COOLANT LEVEL OKAY.THERMOSTAT NEED CHANGING STUCK OPEN.IF THERMOSTAT BEEN REPLACED.CHECK BOTH BOTH RADIATOR HOSES AND HEATER CORES HOSES THEY ALL SHOULD BE VERY HOT.IF ALL HOSES HOT AND BOTH HEATER CORES HOSES GOING INTO FIREWALL IS HOT.HEATER DOOR NOT OPEN ALL THE WAY OR STUCK.IF ONE OF THE HEATER HOSES GOING INTO FIREWALL HOT AND OTHER HEATER HOSE COMING OUT OF FIREWALL NOT HOT.MORE LIKELY HEATER CORE PLUGGED NEED TO FLUSH OUT COOLING SYSTEM.FLUSH OUT COOLING SYSTEM IF NOT BEEN DONE IN A LONG WHILE.

Nov 04, 2011 | 1998 Ford Escort

1 Answer

Heater does not get hot. Air blows out but never gets hot. Have cheked circulation to firewall and don't get any circulation coming out of radiator core. Have replaced thermostat.


Hi, are any of the heater hoses getting hot at the heater core.If both hoses or hot you have a blend door problem.If one hose is out and the other is cold you have a stopped up heater core, if both or cold you have a restriction in cooling system or a weak water pump. Have you tried to flush the cooling system. Thanks if i can help just re post.

Jan 07, 2011 | 2000 Dodge Durango

2 Answers

No heat on 2008 sienna, replace t-stat. one rad hose and one heater hose hot. other rad hose & heater hose cool


If your top rad. hose is cool and the engine is smoking hot, it probably is a blown head gasket. What does you temp gauge read ?

Feb 01, 2010 | 2008 Toyota Sienna

2 Answers

When heat control is set to max hot and fan speed at max, air is slightly cool to warm, not hot.


check the coolant hoses going into the heater core. they are the hoses running through the firewall under the hood. if they are both hot, you way have a heater core blockage. a heater core flush should solve this. if it does, you should follow up with a complete cooling system flush.

Dec 22, 2009 | 2001 Jeep Cherokee

1 Answer

Hot air blows but cools down in 15-20 seconds.


You likely have a restriction in the heater coolant hose circuit - perhaps a coolant control valve not fully opening, or a kinked hose.
Insufficient coolant volume is flowing to keep the heater core hot.
Try back flushing the heater core system with a garden hose to check flow.

Nov 13, 2009 | 2003 Audi A4 Cabriolet

1 Answer

How would i tell if the heater core is clogged?


Under the hood there are two heater hoses going into the heater core,with engine good and warm,both heater hoses should be hot to touch,if only one is hot,and the other is cool to warm,then remove both heater hoses,nad flush the heater core out with a water hose.

Oct 08, 2009 | 2001 Chevrolet Blazer

3 Answers

Heater blows out cold air when on the warm setting ,possibly a plugged heater core


yes this is very likely the problem, have you check your cooling system is it rusty? if so the heater core is plugged, take the inlet and outlet hoses off the core at firewall and use a garden hose to clear it, then have the cooling system flushed if rusty.

Jul 23, 2009 | 1999 Ford Taurus

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