Question about 2004 Chevrolet Blazer

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No floor heat 2004 Blazer

No heat from floor just the defrost and dash vents

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  • Chevrolet Master
  • 21,873 Answers

Usually a sign the blend door is not working under the dash. The blend doors direct air thru the vents and the heater core.

Posted on Dec 12, 2012

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: There is no air flow

You need part GM Part number 89018675 or ACDelco 15-73596. The Mode Selector Actuator. What happens is the part is a CHEAP part POORLY designed and when it goes to turn the flaps inside the HVAC unit its the plastic gear slips instead of turning the flap!!!

Just to forward you you might want a deal to install this art for you unless your good at fixing your own vehicle, because you need SMALL sockets and a lot of patience to get this part in!!!

The part is ALMOST directly above the steering shaft for your steering wheel, so theres a lot you got to remove before you will even see them!!!

I only recommend you to have a dealer put this part in for you, unless you have your own service manual!!

Because there is 5 of these darn things and if you pick the wrong one you will have to do it all over again!!!

3 on the Drivers side and 2 on the Passengers side!!

But replacing this part SHOULD solve all your problems!! AS it did for me and i was having the same issues as you have described!!


Posted on Jul 22, 2008

  • 124 Answers

SOURCE: heater control 98 chevy s10 blazer

These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.

Posted on Dec 13, 2008

morse008
  • 1111 Answers

SOURCE: 1996 chevy blazer my air on heater will not blow

the idea of the switch is run on vacuum and is not making contact with the switch it self either worn contacts in the switch itself **** as an obstruction as well or the vent door is stuck in just that position either behind the glove box or the ash tray are the vacuum lines one of them may be pinched off or the door needs a bit of help until you can free it up

Posted on Sep 08, 2009

emissionwiz
  • 75797 Answers

SOURCE: 98 Blazer...constant heat from heater, both dash

this problem is caused by a failed HVAC temperature control blend door electric actuator, to replace this part you must remove the entire dash assmbly

Posted on Sep 15, 2009

  • 432 Answers

SOURCE: All Air Conditioning blows our the defrost vents

Some thing you could look at would be this. The control is usually fed by a vacuum line or small hose thats is connected to your intake manifold.
With a cold engine,look for a skinny vacuum hose that runs from the intake toward the fire wall . It should be going inside the cab and connecting to the A/C vent control.Some times the hose becomes disconnected or splits or cracks due to heat under the hood.
Thats usually the trouble.
I hope this helps you.

Posted on Oct 06, 2009

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1 Answer

I have a 1975 k5 blazer and it blows cold air it worked fine last year but now it only blows cold air even on the defrost setting what can the problem be and how can I fix it?


A vent flap actuator probably needs to be replaced. It's what moves your vent flaps from heat to A/C or to plain "vent air" when you change settings.

The discussion in the link includes vent flap actuators. Unfortunately, they also include the infamous no low speed fan problem too.

Cannot get any air from dash vents while defrost and floor vents work fine...

Your particular actuator will be a different one than they found.
They're all a absolute pain to get at because they can be well buried in the dash. I would start looking under the dash on the passenger side, that's where most of the air control is. Cannot get any air from dash vents while defrost and floor vents work fine...

Nov 14, 2016 | Cars & Trucks

1 Answer

Why my heat works on my 2004 Chrysler Sebring but it only blows out from my front dash only and not the floor or Front dash defrost?


More than likely a bad vacuum or electric actuator, or bad vacuum line. Actuators control the mode doors to change from floor, vent, and defrost.

Nov 08, 2014 | 2004 Chrysler Sebring

2 Answers

How to repair 2004 Ford Crown Victoria A/C will not blow from dash vents


its either a bad air control panel or u have a bad damper valve in your dash

May 01, 2014 | 2004 Ford Crown Victoria

1 Answer

2004 trailblazer dash vents fail to blow heat. All other vents work normally. I could not locate a vacuum hose that I thought might operate the upper dash vents. what do you suggest? Thank you.


this vehicle has electronic acuators that move the doors and do not use vacuum. the mode door actuator is bad causing this problem. there is a defrost acuator that works the defrost position and a mode door that works floor/vent operation. the defrost moves and diverts airflow up defrost vwents this is why you can still have defrost and floor.

Mar 09, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

Dash vents will not blow air. Defroster and floor vents blow fine.


Is it a new vehicle? I had a new vehicle that had the same problem. Answer was that the holes weren't punched out of the vent.

May 23, 2009 | 2004 GMC Envoy

1 Answer

No floor heat


Many vehicles have a vacuum actuated valve (or flap) internal to the console vent plumbing. The vaccum line going to this valve/vac solenoid may be bad, unhooked or not functioning. In GM products, IIRC, the vac lines inside the vehicle are made of hard plastic, off-white in color (some have a slight green tinge) and are not easily flexible.

Check down under the dash where the floor output is and see if you see some of the plumbing of which I write. Then check to see if there are any loose lines, etc.

Mar 04, 2009 | 2004 Chevrolet Blazer

2 Answers

Heater control 98 chevy s10 blazer


These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.

Dec 13, 2008 | 1996 Chevrolet Blazer

2 Answers

No dashboard heat output


The climate control was poorly designed on these cars.

There is only heat on the floor and defrost settings, due to the layout of the ductwork.

Oct 22, 2008 | 1989 Ford Festiva

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