Jul 22, 2015, 12:37 PM
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2004 Suburban AC - Blows HOT
CF Beginner
Joined: Aug 2019
Posts: 1
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2003 Chevy Suburban AC blowing HOT Air
I have 2003 Chevy Suburban that is also blowing HOT Air on AC mode both on the front vents (Driver and Passenger sides) and also at the back vents for the 2nd and 3rd row. I hope there is anyone out there who can help me out what the problem is and guide me in rectifying this issue. Thanks
CF Veteran
Joined: Dec 2018
Posts: 1,050
Likes: 192
If your 2003 has a separate small AC belt like my 2005 does, check to see if that's broken.
Check if compressor clutch is actually engaging.
Could be a stuck actuator under the dash.
So I say take it in to a real AC shop - not a speedy lube !!! As it sounds like you don't experience in AC.
Check if compressor clutch is actually engaging.
Could be a stuck actuator under the dash.
So I say take it in to a real AC shop - not a speedy lube !!! As it sounds like you don't experience in AC.
CF Veteran
Joined: Dec 2018
Posts: 1,050
Likes: 192
I found the actuator on the passengers side, where the air vent is and removed the 2 screw closest to the passenger door and pulled down the plastic cover to expose the actuator thats causing this issue, then turned on the A/C (mine starts up cold then turns hot) so when it was cold I disconnected the wiring hardness before it switched to hot. This has lasted me 2 weeks so far until I can figure out my next move. 
CF Beginner
Joined: Aug 2024
Posts: 1
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Don't undstand
This simple actuator calibration worked for me,
Place the ignition switch to the OFF position.
<?xml:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" /><o
>Remove the HVAC/ECAS fuse (which is located in the fuse box under the hood) for a minimum of 10 seconds. <o></o>
Install the HVAC/ECAS fuse. <o></o>
Start the vehicle. <o></o>
Wait 40 seconds for the HVAC control module to self-calibrate. Do not adjust the A/C controls until after 40 second or so.
At first the air was very hot then it went to cold and all was well again. Good luck. <o></o>
</o>
Place the ignition switch to the OFF position.
<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com
fficeffice" /><o>Remove the HVAC/ECAS fuse (which is located in the fuse box under the hood) for a minimum of 10 seconds. <o></o>Install the HVAC/ECAS fuse. <o
></o>Start the vehicle. <o
></o>Wait 40 seconds for the HVAC control module to self-calibrate. Do not adjust the A/C controls until after 40 second or so.
At first the air was very hot then it went to cold and all was well again. Good luck. <o
></o></o
>If the vehicle is already powered off, how would popping a fuse out of its socket have any affect on its memory?
My problem just started out of the blue. When it happens, I simply put the vehicle in park, turn it off, restart and ac starts working fine. This has happened twice in the last 3 days. Happened weeks apart a couple of times, all since the end of June. Last time it happened, I noticed that ac was blowing cold, then all of a sudden started blowing hot.
Last edited by martins757; Aug 12, 2024 at 7:53 PM. Reason: Add info.
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