AC Problem

[Daddyar]

Not sure this is the right place, but I have an issue with my AC. 1997 Silverado ECSB 5.7. It works, but if there’s a diesel truck nearby, I get their exhaust smell in my cab. I don’t notice any difference when I push in the recirc button. The temp knob, fan speed, and defrost knobs all work as they should. Any ideas?


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[RawbDidIt]

Not sure this is the right place, but I have an issue with my AC. 1997 Silverado ECSB 5.7. It works, but if there’s a diesel truck nearby, I get their exhaust smell in my cab. I don’t notice any difference when I push in the recirc button. The temp knob, fan speed, and defrost knobs all work as they should. Any ideas?


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Are you sure it's not your door seals that are blown? Either that or the cabin air filter?

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[Daddyar]

I don’t think my truck has a cabin filter. I doubt it’s the door seals, as it’s only when the AC is on. I also don’t think it’s the control panel as it seems to work fine. The recirc light turns off when switched to defrost.


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[df2x4]

I don’t think my truck has a cabin filter.

You're correct, none of these trucks do.

 

[east302]

Does the recirc door actuate? It’s between the blower and firewall, look up from the floor.

 

[bugdewde]

I bet the recirc door is not operating correctly.
Search recirc door on here to see plenty of ideas/fixes.
Things that come to mind:
- Door sealing foam bad.
- Door actuator motor not working.
- Door actuator arm unhooked/broken.
- Door actuator may need to "re-learn" it's stop/start position (not sure if that actuator does that... but read that some do).

Seems to be a common ussue.