Question about 1999 Chevrolet Silverado 1500

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Blowing cold air

1998 chevy 1500 truck blowing cold air instead of warm when heater is on , change themostat, heater core hoses is warm, is there a door in the duct system , could be block

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  • djackson777 Feb 16, 2009

    My chevy truck blows cold air when I turn the heater on and won't get hot at all. Checked fuses etc.; what do I do now?

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I had the same problem that I just fix by flushing the heater core out with a hose.   take the two hoses off the fire wall and put the water to it and let flush.  my heater is putting out 150 dg. F  of hot air.   I'm so excited!  i will stay warm now.

Posted on Feb 27, 2009

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Won't put out any heat

Posted on Oct 25, 2013

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The problem is the air temp control blend door electric stepper motor is defective, in order to change this part and make sure the blend door moves freely u must remove the entire dash assembly.

Posted on Dec 22, 2008

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2 Answers

1999 chevy silverado heater fan only blows cold air , both coolant lines in are hot


I like that you were knowledgeable to check both coolant lines tells me you are getting hot coolant through the heater core next thing to check will be the blend door on the inside of your vehicle. The blend door is a door that switches from cold air duct to heater duct depending on what you are using at the time. If it is stuck on the cold air duct you will not get any heat sometimes these doors are vacuum actuated and sometimes they are electrically actuated most the time you are able to see the movement of the motor from inside if you don't see any movement but you hear it move chances are it is the door blend I hope this helps.

Jan 10, 2013 | 1999 Chevrolet Silverado 1500

1 Answer

Heater blows cold air,replace belts,themostat,accuator(door llender)


try flushing your coolant system. if you have air compressor.remove hoses to heater core and try ro blow it out. also with the car running see if the hoses are the same temp. if not try blowing out the heater core. also start the car and see if the water pump is pushing water out of the hose goimg to the heater core. also a bad radiator cap could keep it from heating up.let the car run and see if the top hose gets hard to where you can not squeeze it. if you can than replace the radiator cap. hope this helps leave comment.

Feb 13, 2011 | 2001 Chevrolet Silverado 1500

1 Answer

Not blowing out hot air, changed themostat heater hose, blower works fine,also flushed out readiator,there is no indication of any leak from the heater core underneath dash board of any antifreeze..?


#1 could be the dash temp control not working(not very common) #2 could be the warm/cold air door motor not working , this is located under the dash.

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Dec 01, 2010 | 1997 Buick LeSabre

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I have a 2000 Chevy Silverado pickup, and the heater will not blow hot air. I replaced the thermostat, and nothing changed. The radiator was flushed and filled in the last two months as well. I have all...


once truck is warm check both heater core hoses to make sure they are both warm if not then check the cold water valve could be stuck shut not allowing coolant to travel in to heater core.

Jan 05, 2010 | 2000 Chevrolet Silverado 1500

1 Answer

I have a 1994 chevy 1500 blower works full of antifreeze and hoses get tight when truck is warm but blows only cold air


if your truck is not overheating and shows no other signs of a cooling system problem, i would suspect a clogged heater core. you can try to flush it out by removing both heater hoses from the heater core, and with a garden hose, flush the core in both directions

Dec 06, 2009 | 1991 Ford F150

2 Answers

All i get from my heater is heat i cant turn the ac on, and when i turn off the heater it still blows hot air


Sounds like a stuck heater core valve. Find heater core valve. Under hood, find the two heater core hoses going into firewall. One of the hoses has a valve. Operate temperature control (full heat, then full cold) check that valve changes position. If not either replace valve or control system failure. Also, when temperature control in cold position, one hose should feel hot and the other cold. Temp fix: disable valve to close no heat or on heat.

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