heater question... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

unreconstructed1 · 12-07-2010, 10:56 PM

On my 97 K2500, regardless of where my temp controls are set, the dash vents ALWAYS blow hot air. I was thinking it may be the climate control itself, but I was curious if it was something else. defrost and floor vents work, but even when they are blowing that danged dash vent is still blowing hot air. makes it a PITA considering where the cup holder is. so, any ideas?

ChevLoRay · 12-08-2010, 12:02 AM

I'm going to guess that the blend door motor is not working properly. It is not unusual for this to be a problem. Here's a pic of an HVAC unit. The blend door is in the general area behind the radio. Do a search and you'll find numerous posts as well as some How-To instructions.

ChevyTech · 12-08-2010, 11:16 AM

The temp door motor is the one in the center of the ductwork.

Remove the glove box and watch & listen for movement when you change the temp on the control. The motors are a high failure part.

You can put your hand on it and feel if the motor runs or not.

unreconstructed1 · 12-08-2010, 09:03 PM

thanks guys. I'll try this.

12-07-2010, 10:56 PM	#1
unreconstructed1 nec absolutum Join Date: Jan 2007 Location: Tennessee Posts: 223	heater question... On my 97 K2500, regardless of where my temp controls are set, the dash vents ALWAYS blow hot air. I was thinking it may be the climate control itself, but I was curious if it was something else. defrost and floor vents work, but even when they are blowing that danged dash vent is still blowing hot air. makes it a PITA considering where the cup holder is. so, any ideas? __________________ "The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants."~ Thomas Jefferson 1967 GMC C1500 LWB 250/3 on the tree- 1969 Chevy C/10 SWB 350/TH350 1996 Chevy Silverado LWB 350/4L60E 1997 Chevy K2500 350/4L80E

12-08-2010, 12:02 AM	#2
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: heater question... I'm going to guess that the blend door motor is not working properly. It is not unusual for this to be a problem. Here's a pic of an HVAC unit. The blend door is in the general area behind the radio. Do a search and you'll find numerous posts as well as some How-To instructions. Attached Images __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

12-08-2010, 11:16 AM	#3
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,621	Re: heater question... The temp door motor is the one in the center of the ductwork. Remove the glove box and watch & listen for movement when you change the temp on the control. The motors are a high failure part. You can put your hand on it and feel if the motor runs or not. __________________ For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. Last edited by ChevyTech; 12-08-2010 at 11:18 AM. Reason: Add more

12-08-2010, 09:03 PM	#4
unreconstructed1 nec absolutum Join Date: Jan 2007 Location: Tennessee Posts: 223	Re: heater question... thanks guys. I'll try this. __________________ "The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants."~ Thomas Jefferson 1967 GMC C1500 LWB 250/3 on the tree- 1969 Chevy C/10 SWB 350/TH350 1996 Chevy Silverado LWB 350/4L60E 1997 Chevy K2500 350/4L80E



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