Question about 1999 Chevrolet Silverado 1500

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How to get a blend door unstuck so heat will work on a chevy 1999 silverado truck

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How do you know the blend door is stuck , could be a bad actuator .

Posted on Dec 07, 2016

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Posted on Jan 02, 2017

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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

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Sounds like the blend door is not moving. Most blend door actuators are located on the bottom of the heater box near the middle of the car. If the temp control is a round knob, it is an electronic actuator.

Dec 12, 2012 | 1999 Chevrolet Silverado 1500

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If you know for a fact the compressor is running and one of the lines is cold, I would look for a blend door problem. The blend doors direct air thru the heater and evaporator.

Aug 31, 2012 | 1999 Chevrolet Silverado 1500

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check anti-freeze level,needs to be full.heater blend door might not be working or engine thermostat could be bad

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2 Answers

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The temp blend door, or blend door actuator may be faulty. You can check this by watching the movement of the blend door actuator while you turn the temp selector knob. If the actuator is working, then it may be the blend door, or blend door lever broken. If these are ok then the control head may be faulty.

Oct 18, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

2000 Chevy Silverado 1500 The heater does not


Had the same thing happen to my truck, the blen door actuator is under the console on passenger side, but the heater core is going to be clogged if you dont have any heat coming through, but a/c works..

Sep 08, 2009 | 2000 Chevrolet Silverado 1500

1 Answer

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Sounds like the blend door in the ducting has failed, this door is what controls the temp of the outlet air by blending heat and outside air or AC cooled air.

Nov 01, 2008 | 1999 Chevrolet Silverado 1500

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