2000 S10 Blazer climate control issue
I am new to this forum so I hope I am doing this correctly. I have a 2000 s10 blazer 4x4 and recently only hot air comes out of the front AC vents. The temperature control changes nothing and the Defrost, AC, floor vent selector changes nothing. Is this a vacuum line issue? Or is it an electrical problem?
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The air flow to the vents are controlled by vacuum actuators or motors. If you are unable to change the airflow to the various vents, then start looking for a vacuum line break in the engine compartment. Check the lines and connectors.
Are you able to put the vehicle into 4wd? |
I would go would go with a bad HVAC control unit in the dash. Normally I would say it's a vacuum leak, since air only comes out the dash vents (the "default" position when there's no vacuum). However, the air temperature door is a motor-driven actuator (the rest are vacuum actuators). If it were just a vacuum issue, I would think you'd get more than just hot air to blow out the vents.
Check out this schematic that might help you understand what's going on inside the vents. Kind of hard to understand at first, but the bottom illustration shows the flow of air from outside to the various vent positions, as well as the actuators that control the air flow at each point. |
Originally Posted by LannyL81
(Post 508310)
The air flow to the vents are controlled by vacuum actuators or motors. If you are unable to change the airflow to the various vents, then start looking for a vacuum line break in the engine compartment. Check the lines and connectors.
Are you able to put the vehicle into 4wd? Yes it will go into 4wd, 4w auto, 4lo, and 4hi. Will check the vacuum lines. |
Originally Posted by aa21830
(Post 508334)
I would go would go with a bad HVAC control unit in the dash. Normally I would say it's a vacuum leak, since air only comes out the dash vents (the "default" position when there's no vacuum). However, the air temperature door is a motor-driven actuator (the rest are vacuum actuators). If it were just a vacuum issue, I would think you'd get more than just hot air to blow out the vents.
Check out this schematic that might help you understand what's going on inside the vents. Kind of hard to understand at first, but the bottom illustration shows the flow of air from outside to the various vent positions, as well as the actuators that control the air flow at each point. |
Temp actuator is in the passenger side, tucked behind the actuator you'll see on your left, after removing the glove box. Try these instructions (which I stole from here):
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2 Attachment(s)
I 'cadged' these off another member..
I think you have more than just an actuator problem |
Originally Posted by pettyfog
(Post 508398)
I 'cadged' these off another member..
I think you have more than just an actuator problem |
Originally Posted by garylb24
(Post 508603)
It now will switch between defrost, AC vent and floor, but I cannot get it to bring cool air, it is only hot air that comes out of the vents. I can now hear the air movement shift as I switch the selector to the different positions. It just started this today. I did not find any vacuum lines not connected to where they go. Is the the temperature actuator fault?
There's several videos on youtube as well |
I have the same problem. I cannot swich the air flow from vent to defrost or floor but I can change the temperature. There are colored vacuum lines behind the glove box. Is that the actuator?
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