Question about 2001 Chevrolet Silverado 1500

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2004 Chevy Silverado heater blows cold air. What would cause this problem?

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  • Fernand Luc Bergeron
    Fernand Luc Bergeron Jan 03, 2011

    level of antifreeze ? last change of thermostat ? last change of cabin air filter ?

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  • Master
  • 228 Answers

The heat is independant from your ac. look for leaky radiator hoses or heater hoses,radiator cap,coolant

leaks inside your cab under the dashboard on your floor board. if you have non of these problems.

you may have a blocked or stopped up heater core and it will need to be replaced. depending on the

truck some replacements are easy and some hard , trucks and cars vary. good luck!

Posted on Feb 13, 2011

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Posted on Jan 02, 2017

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jagjeffery
  • 318 Answers

SOURCE: 2004 Chevy Silverado AC is blowing warm air on passenger side.

You have dual zones that are controlled by temperature actuators the passenger side has lost its memory or has gone bad you can put it in self programming by disconnecting the battery for ten minutes then hook it back up start the truck turn the temperature control on but do not touch any other controls let it go thru the self programming for about 6 to 7 minutes then select your temperature you want if it still does not work properly you may have a bad actuator or a bad connection at the actuator

Posted on Jun 03, 2009

hankfan18436
  • 62 Answers

SOURCE: 2000 Chevy Silverado 4X4 - Heater isn't blowing hot air

No your thermostat is stuck open which will not hurt the engine. but needs to be replaced, the thermostat is what allows the engine get up to operating temp. before allowing water to flow through the radiator and when it is stuck open it doesnt allow the engine to reach operating temp. so the heater never gets hot. I hope that helps you out.

Posted on Nov 24, 2008

  • 3 Answers

SOURCE: 2004 Chevy Silverado Heater blows cool air

Check blend door actuator for operation

Posted on Feb 15, 2009

  • 9 Answers

SOURCE: one side air blows cold one side blows hot

GM has a known problem with the electric actuators that operate the blend and temperature doors in the HVAC system. There are 4 or 5 of these in the typical system. Any can start sticking or binding and cause this problem. Sometimes they can be cleaned, or they might need to be replaced. Sometimes resetting the HVAC system controller by disconnecting the battery for 10 minutes, then reconnecting it, will correct the problem.

Posted on Sep 15, 2009

  • 2841 Answers

SOURCE: 1989 chevy silverado heater blowes cold air. both

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.

Posted on Nov 07, 2009

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1 Answer

My 2004 Chevy only blows warm air on the passenger side my driver side is always cold. It has a dual air systems, but my A/C works great on both sides. What can i do to fix this problem ?


i am an owner also same vehicle there is a baffler in the center of the console next to the front window it you can find it cause there is a little hole you cn see this controls the air distribution to the driver side . i tried getting to it twice it is difficult to remove all that. Was close but ran out of time and gave up was quoted over $300
to repair if i removed the steering wheel it might have been easier to solve . good luck

Jan 05, 2013 | 2004 Chevrolet Silverado

1 Answer

Heater is blowing cold air. I have a chevy 2001 silverado extended cab, long wheel base. what could cause this?


My truck had the same issue and from I have read, it is pretty common. I just felt the heater hoses under the hood. If there is one hot and one cold, with the engine running and the heater set to maximum, rapidly squeeze and release the hot hose for about fifteen seconds.I just did this to my truck and it "Burped" the heater core. I got instant LAVA HOT air!! I hope this helps.

Dec 02, 2010 | 2001 Chevrolet Silverado

1 Answer

2004 Chevy silverado air blows cold but will not switch off of defrost how can i fix this problem


Heater failure is designed to fail in defrost mode. Check for leaking or dislodged vac hoses.

Sep 06, 2010 | 2004 Chevrolet Silverado

1 Answer

2004 Chevy Silverado with a/c on it starts out cold and then drivers side switches to blowing hot air and passenger side still cold. Shutting the truck off resets it but is getting more frequent.


What I believe you have happening is one of your control doors inside of the heater/AC plemium is bleeding off.
Most of these are operated by a vacuum system and it sounds like you have a leaking vacuum line.
The bad news is there is no quick way to find it problem.
Look for the vacuum lines that control the heater-A/C functions and start tracing them out.
You may find a Hilton repair manual at your local auto parts store that will show the approximate location of these control lines
These problems often are better handled if you are already bald, cause your will be by the time you find the problem
Best of luck

Apr 07, 2010 | 2004 Chevrolet Silverado 3500

2 Answers

One side air blows cold one side blows hot


GM has a known problem with the electric actuators that operate the blend and temperature doors in the HVAC system. There are 4 or 5 of these in the typical system. Any can start sticking or binding and cause this problem. Sometimes they can be cleaned, or they might need to be replaced. Sometimes resetting the HVAC system controller by disconnecting the battery for 10 minutes, then reconnecting it, will correct the problem.

Aug 09, 2009 | 2004 Chevrolet Silverado 2500HD

1 Answer

Intermittant hot/cold air from heater


Had the same problem with my Mazda6 awhile back. Took it to the dealer and they found the radiator wasn't holding pressure. They replaced the whole radiator under warranty (WHEW!). Not sure how to check for that kind of thing, but it's a start.

Jan 01, 2009 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

2000 Chevy Silverado 4X4 - Heater isn't blowing hot air


No your thermostat is stuck open which will not hurt the engine. but needs to be replaced, the thermostat is what allows the engine get up to operating temp. before allowing water to flow through the radiator and when it is stuck open it doesnt allow the engine to reach operating temp. so the heater never gets hot. I hope that helps you out.

Nov 24, 2008 | 2004 Chevrolet Silverado

2 Answers

Heater blows cold on 02 chevy silverado 1500 4.3 V6


i had the same problem with my 2000 chevy truck!! i took both hoses off engine and flushed the heater core with water and air frome air compresser,added new coolent and it works perfect!!!! so try flushing your system............

Nov 17, 2008 | 2002 Chevrolet Silverado 1500HD

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