Question about 2004 Chevrolet Silverado 1500 Crew Cab

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Location of fuse box on 2004 chevy silverado 1500

Heater not blowing warm air

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Posted on Jan 02, 2017

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SOURCE: blowing cold air

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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SOURCE: 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..

Posted on Oct 06, 2009

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1 Answer

2003 chevy 1500 ss only blows cold air no heat


Dual climate control on these is not a manual valve adjuster. It is done electronicly with a electric motor on a valve instead of ran by a maual cable. Find this and check the plug for a 12 volt signal. If you are getting a signal replace the valve, if not it could be a blown fuse, cut wire, or a bad climate contol switch.

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Sounds like a bad actuator, the actuator is a small motor used to control a door in the heater box, there are a few doors to control temp of air and then one for mode (location of air blowing out ) and one for recir. try to locate and unplug it and replace the fuse and see if that stops the fuse from popping if it does then replace the actuator.

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Feel the hoses going into the heater on the firewall. If one is hot and the other is cool, then the heater control valve is not working for whatever reason. Check the flow valve.

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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..

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For your 2nd question..it's just the nature of the beast.

Hope this helps you

Dec 23, 2008 | 1999 Chevrolet Silverado 1500

3 Answers

Blowing cold air


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.

Dec 22, 2008 | 1999 Chevrolet Silverado 1500

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2005 chevy silverado 1500 v6 the heater and ac quit working


your speed switch located in heater box usually one wire to it in passenger feet area above "TOES" usually you loose 1 or 2 speeds on fan but it is unplugged or completely cooked good luck!

Dec 13, 2008 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

My truck dosnt get hot in the cab blows warm cool air!


I would check your heater control valve, that, or the core itself being bad, are the two most common problems I've had with Chevys.

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