Question about 2004 Pontiac Grand Prix

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Engine not heating up

Car runs well, engine temp remains cold

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You either have low coolant or your thermostat is stuck open and will need replaced.

Posted on Jan 18, 2013


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Posted on Jan 02, 2017


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2005 nissan sentra 1.8 se has cold air blowing from inside vents with temp select switch set on the HOT position. What could be the cause of this problem?

Sounds like the heater - ac door actuator is not working. This part would need to be replaced, it's not repairable.

Nov 24, 2013 | 2005 Nissan Sentra 1.8

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Engine overheat and no heat

Maybe your radiator is clogged.

Mar 12, 2017 | 2001 Nissan Sentra

1 Answer

Engine temp remains to cold and is not reaching operating temp quick enough

remove, test and (most likely) replace the engine's thermostat - if there is one in there now? To test thermostat, put in a pan of water on a stove top, it should open just ahead of water boiling temperature..
Best regards

Jul 17, 2012 | Cars & Trucks

1 Answer

Heaters blow cold

could be heater core failure.

If the temp guage remains cold....the thermostat is stuck open, therefore coolant is running thru the motor always. Therefore, no heat anywhere, and poor gas mileage.

Apr 01, 2010 | 1993 Ford Festiva

2 Answers

2005 chev equinox,check engine light on,was diagnosed as engine coolant temp sensor,replaced and light came back on,also engine is running cold will not generate any heat... had car back to shop and they...

Lots of newer GM vehicles have a code that reads, engine temp below regulated temp or voltage, thats a thermostate issue. Also as mentioned this is a good time to do a flush.

Dec 26, 2009 | 2005 Chevrolet Equinox

1 Answer

My heater fan turns on before the car has warmed up. It blows cold air? Any ideas why?

After warmup it still blows cold, or only when cold? Normally the fan will operate independently of engine temp except in some climate controlled vehicles. As long as it blows warm air after engine is at temp that's a good thing. the heater uses hot water from the engine. Obviously the heater can't be warm before the engine is. If it's cold after the engine is hot, there are vacuum controlled "motors" on top of the heater box under the dash that move doors that control heat. Either one of the control motors or one of the doors have stuck or failed. Many also have a control valve on one of the heater hoses under the hood as well. If the engine comes up to temp then the thermostat is good (should be at about 210f) Only remaining item is the core itself which may be internally or externally obstructed.
All this being said, if it's good when the engine is up to temp, leave it's fine.

Nov 30, 2009 | 1996 Jeep Grand Cherokee

2 Answers

99'concorde stalls,wont start until cool again..

When cold, your engine runs from a different computer mode than when warmed up...It seems that when you reach temp, the normal "run" program transitions in (undercomplicated version) Usually when the signal from the temp sending unit does not change (bad sender) the engine will remain running but will run rich. Usually if the sending unit wire is disconnected it will also remain in "cold" mode. I'm thinking that possibly the sender is internally shorting out or the computer isn't working correctly. If you have an engine light on, likely you can retrieve a code that may point you to something in that area. Or, since sender isn't very costly, change it and see if the problem clears up. (I'm not a big fan of just putting in parts without testing, but in this case it may pay off)
Good Luck

Jul 27, 2009 | 2000 Chrysler LHS

1 Answer

Ford Windstar SE, 3.8L V6, 1999, front seat heat/defrost is cold

the blendor actuators strip out the gear inside the actuator cases on these all the time. replace the actuator.

Mar 10, 2009 | 1997 Ford Windstar

1 Answer

Car temp gauge/heat

TDIs can take a while to heat up in cold weather. Sometime 10 minutes or more.

If it is taking longer than 10 mins for your temp gauge to hit 190, you may need a new temp sensor, which is pretty cheap and just pops into the engine block, almost right next to the battery.

Jan 13, 2009 | 2003 Volkswagen Jetta TDI

1 Answer

Heater won't get hot

change your thermostat, its stuck open. I had the same problem and now I have heat!

Nov 24, 2008 | 1987 Toyota Celica

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