Question about 2004 GMC Sierra

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No heat Engine temp is normal, blower fan works but no heat in any heater position

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Check the ant-freeze level and also make sure your thermostat is not sticking.

Posted on Feb 21, 2009

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Valve that allows heater core air to flow into compartment is closed.

Posted on Feb 21, 2009

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1 Answer

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Engine tepmrature goes up or down when i turn on the heater


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Heater doesnt work


To troubleshoot this types of problem,click the link below :---
Car heater blowing warm, but not hot air?http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html

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http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Heater blows intermittently and temp gauge goes erratic?

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Heater blows cold?

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Heater/AC blower motor not working?

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This will help.Thanks.

Mar 27, 2012 | 1994 Volvo 960

1 Answer

My 1998 dodge ram 1500 heater wont blow hot air I replaced water pump ,thermostat and radiator blower works fine just no heat.


check to see if both heater hoses are same temp when engine is at normal running temp if not heater core not flowing coolant may need to flush also make sure it does reach normal temp around 200

Jan 31, 2010 | 1998 Dodge Ram 1500 4WD

1 Answer

Why is my heat/front defrost not working very well. Only shoots warm air? And not very forceful.


hi from uk can i offer this advice ? when you start engine let it warm up a little then drive untill temp guage reads warm at least ? then when you put front screen defrost on only select screen and No 2 speed then as temp reaches normal screen will clear fully if you select full speed on heat blower to clear screen at first start it will not work because the coolant from engine passing thro the heater matrix/radiator will be rapidly cooled by fan of heater TRY IT? in years gone by it was common remedy if you were stuck in traffic and temp rose towards hot you could cool system down by putting heater on full heat and the fan on max this cooled the engines coolant as it passed thro the heater ?hope you understand how heater/fan should work for optimum efficiency my wife has owned 2 of these accents and never had heat/demist problems it is surprising how many people consider the demist/heater systems are poor on many cars not just hyundai hope this helps best wishes

Dec 15, 2009 | 2001 Hyundai Accent

2 Answers

No heat,engine temp.is normal


the valve that allows the hot water into the heater core is not opening. most likely electronic issue. also check all vacuum and electric lines.

Nov 03, 2009 | 2000 GMC New Sierra 1500

2 Answers

Only getting lukewarm air from heater even with new thermostat


1. maybe your ac condenser blower is not working properly
2. slipping ac belt
3. air con compressor hub is sliding due to oil leak

Dec 10, 2008 | 1994 Subaru Legacy Outdoor

1 Answer

I have no heat in my 2000 expedition. Is it the heating coil? Or could there be another problem?


Is the blower fan for the heater going on, but only cold air? If the fan is working, but no hot air situation, 1st check the coolant level, if it's low, the coolant won't flow thru the heater core, so little or no heat. If level is ok, what does the engine temp gauge indicate? Is the engine running normal temp range, cold, hot? Let me know answers to these questions so I can help u.

Dec 08, 2008 | 2000 Ford Expedition

2 Answers

Heater is out


coolant level is fine still no heat

Nov 24, 2008 | 2002 Ford Expedition

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