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No heat at idle - 2007 Chevrolet Uplander LS Minivan

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Have a 2004 Murcury Sable. Whenever I turn on the heat the car starts surging high and low then shuts off. Doesn't overheat but idles poorly??? Only when turning on heat or air.


Problem With Idle Air Bypass Valve May Cause Engine ...

repairpal.com > Problems > Mercury > Sable
If you experience difficulty starting the engine when cold, stalling at idle, ... Also, this summer electric locks stopped working and recently car seems to idle high whensitting or when I put heat on. ... I was either braking and barely moving in traffic andwhen I would also turn on the ... 2004 Mercury Sable- 3.0L V699,000Visitor.

03 MERCURY SABLE ROUGH IDLE CAUSE - YouTube



Nov 19, 2015 | Cars & Trucks

1 Answer

2004 Kia low heat at idle hiway speeds ok


On these and many other vehicles, use a vacuum refill coolant air lift.This removes all air in the cooling system and then fills the cooling system fully with coolant.

Jul 09, 2017 | 2004 Kia Sorento

1 Answer

2000 oldsmoble intrigue has no heat at idle


Sounds like there is still air pockets in the coolant system, let idle to full temp with the cap off and the car on an upword angle to alow air to move then while engine running and coolant if needed to hot mark on the coolant tank.

Dec 02, 2013 | 2000 Oldsmobile Intrigue

1 Answer

No heat at idle


This can be caused by a low coolant level in the radiator or a defective engine thermostat.

Jan 19, 2012 | GMC Cars & Trucks

3 Answers

2008 Chevy Uplander has 21,000 miles. Nno heat from rear heater at idle. Disconnected hoses and flushed, water flowed good. Reconnected hoses and still no heat. Raised idle to 2000 rpm and got good heat....


Uplanders with the 3.9 engine are prone to no heat at idle speeds. Probably weeping head gasket. Air bubble trapped. Dealers will remove rad cap and let it sit at about 25 deg. angle for a couple hours. Good for awhile.

Nov 15, 2010 | 2008 Chevrolet Uplander

1 Answer

My 1997 Sebring overheats while in idle but


does it overheat going down the road if not check to see if radiator fan(s) is running when it heats up at idle car needs fan to run cool at idle but not while going down road

Feb 17, 2010 | 1997 Chrysler Sebring

1 Answer

95 civic over heating and idling rough


check you oil and your antifreese mine just did this to me and it didnt smell like cooland but i was loosing coolant throug the motor but not onto the ground and my idle did the same thing yours is doing i am willing to bet its the headgasket

Dec 25, 2009 | 1995 Honda Civic

1 Answer

Replaced t-stat and water pump and sill no heat at idle ????


Do you have heat while driving? If you do, it sounds like air is in the system. 1st check the coolant level to make sure it's correct, as low level will cause no heat at idle, and eventually no heat at all along w/ engine overheating.

Dec 10, 2009 | 2001 Chevrolet Suburban

1 Answer

2002 duramax will heat up underload but not at idle any ideas why


No diesel I have ever owned will heat up to operating temp while idling. I have had semi's and dump truck and a Dodge with a Cummings turbo diesel. If you don't idle a diesel up to around 1200 rpm while sitting the combustion chamber temperature will drop because the diesel does not ignite fully at low rpm. You may also notice after an extended period of idling 1/2 hour or more that when you pull away the exhaust will be whitish blue because of the unburnt diesel fuel sitting on top of the rings. Also extended low idle will wash down the cylinder walls with unburnt diesel and remove the oil from lubricating the cylinders and rings. Hope this helps you understand why your diesel won't heat up while idling. Mike

Jan 06, 2009 | 2002 GMC Sierra

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