2008 trailblazer A/C blowing hot air - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

Welcome Enthusiast! If you already own a Chevy TrailBlazer or GMC Envoy or perhaps thinking of purchasing such a vehicle, then you have come to the best TrailBlazer and Envoy site on the net! Rainier, Bravada, Ascender, and 9-7x owners welcome too!

You are currently viewing our site as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to search and post topics, communicate privately with other members, respond to polls, upload content, and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.
Join Today!
Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2006 - 2009 TrailBlazer SS Tech > 06-08 SS General Tech Q&A > General

General If it doesn't fit in any other forum

TrailVoy.com is the premier GMC Envoy Forum on the internet. Registered Users do not see the above ads.
Thread Tools
Old 04-28-2019, 11:23 AM
Crobbi Crobbi is offline
Junior Member
Join Date: Apr 2019
Posts: 1
2008 trailblazer A/C blowing hot air

The a/c system only blows air thru defoster and feet area no matter what. Wont blow out dash area even if i have it as heater. Pulled fuses 36 and 39. Still blows hot air most of the time. Every once in a while i will get cool cold air but never thru dash. Suggestions? Yes i have a new battery.
Reply With Quote Quick reply to this message
Sponsored Links
Old 04-28-2019, 01:58 PM
EnvoyBoy2004's Avatar
EnvoyBoy2004 EnvoyBoy2004 is offline
New Member
2004 GMC Envoy SLT
Graphite Metallic 4.2L I6 4X4
Join Date: Sep 2014
Location: NY
Posts: 2,068
Sounds like you may have two problems. One being that apparently nothing comes out of the face vents, this most likely is the Mode actuator.

Next, you need to determine if the AC system is actually working. With engine running and HVAC controls set to AC, see if the AC compressor is engaging and the silver cylinder on the passenger side firewall is getting cold. If these don't, then the system needs to be troubleshot.
Reply With Quote Quick reply to this message
Old 05-01-2019, 07:08 PM
RPatton76 RPatton76 is offline
New Member
2008 Chevy TrailBlazer LT
Imperial Blue Metallic 4.2L I6 2WD
Join Date: Apr 2017
Location: Phoenix, AZ
Posts: 54
If yours is like mine, the A/C compressor is not allowed to engage when the coolant temperature gauge has an error message of "low coolant temperature" and a check gauges light is also lit up. We clear codes for our gauge to work again. Not sure why it works for us, but we have similar mode issues with only face vents that work or defrost, no floor vents, ever.

Rob in AZ
Reply With Quote Quick reply to this message
Old 05-02-2019, 01:11 PM
John in RI's Avatar
John in RI John in RI is offline
2005 BowTie TrailBlazer LT
Olympic White '50U' 4.2L I6 4X4
Join Date: Aug 2018
Location: Greene, RI
Posts: 104
Read thru this thread,.... should be all the info you need to get the HVAC mode actuators replaced.


I've posted a few pics to that thread to help ID each of the accutators and to show how they must be indexed before they get installed.


P.S. I've got good spare actuators available for sale. If you are interested,just send me a PM for more info.

Reply With Quote Quick reply to this message
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum forums, you must first register.

Please enter your desired user name, your email address and other required details in the form below.
(Only letters, numbers, dashes and underscores are permitted for user names)
The user name that you choose is permanent and can never be changed.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2008 Trailblazer Air Conditioner blows hot air stever0114 General 9 08-30-2018 03:33 PM
2008 trailblazer LS,Problems with temp gauge and A/C ceast71112 General 3 08-29-2017 07:32 PM
Cold Air Inductions In. new supporting Vendor!! Bill at CAI Inc Basic Vendor GroupBuys 25 10-25-2011 05:39 PM
A/C blew hot air saadmoughal OEM Issues 0 06-27-2011 02:50 PM

» Sponsors

Advertising Info

All times are GMT -4. The time now is 03:09 AM.

Chevy TrailBlazer and GMC Envoy Enthusiasts - Copyright 2004 - 2009 All Rights Reserved.
All trademarks referenced herein are property of their respective owners.
RSS Feed