# A/C in Dodge Diesel Trucks

**URL:** <https://community.cartalk.com/t/a-c-in-dodge-diesel-trucks/18383>\
**Category:** Maintenance/Repairs\
**Created:** [August 19, 2008, 2:18pm UTC](https://community.cartalk.com/t/a-c-in-dodge-diesel-trucks/18383 "2008-08-19T14:18:28Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![andysuzi](https://avatars.discourse-cdn.com/v4/letter/a/e47774/32.png) [@andysuzi](https://community.cartalk.com/u/andysuzi)\
**Post date:** [August 19, 2008, 2:18pm UTC](https://community.cartalk.com/t/a-c-in-dodge-diesel-trucks/18383/1 "2008-08-19T14:18:28Z")

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My friend and I both own Dodge Diesel trucks and we are both having a/c problems…cool air comes out of driver’s vents, but only lukewarm air comes out of passenger vents…doesn’t seem to matter what setting the control is on either. HELP…we live in ARIZONA!!

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**Author:** ![rrhoff](https://avatars.discourse-cdn.com/v4/letter/r/8e7dd6/32.png) [@rrhoff](https://community.cartalk.com/u/rrhoff)\
**Post date:** [August 19, 2008, 4:06pm UTC](https://community.cartalk.com/t/a-c-in-dodge-diesel-trucks/18383/2 "2008-08-19T16:06:37Z")

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i had the same problem on my car.it was low on freon /134a.so i took it to the a/c shop they purged the unit and added 134a oil and leak detector.you might have a leak in your a/c system since it is a closed unit.their is the blend doors could be stuck.

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**Author:** ![researcher](https://avatars.discourse-cdn.com/v4/letter/r/edb3f5/32.png) [@researcher](https://community.cartalk.com/u/researcher)\
**Post date:** [August 20, 2008, 4:57pm UTC](https://community.cartalk.com/t/a-c-in-dodge-diesel-trucks/18383/3 "2008-08-20T16:57:20Z")

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Check the vacuum pump and the vacuum lines. Since diesel engines cannot use manifold vacuum there is usually a separate pump to supply vacuum to all the HVAC actuators. This can be an engine driven pump or an electrical vacuum pump.

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**Author:** ![vwfueldoor](https://avatars.discourse-cdn.com/v4/letter/v/e95f7d/32.png) [@vwfueldoor](https://community.cartalk.com/u/vwfueldoor)\
**Post date:** [August 21, 2008, 12:14am UTC](https://community.cartalk.com/t/a-c-in-dodge-diesel-trucks/18383/4 "2008-08-21T00:14:34Z")

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what years?

the new stuff run servos not vac.

may just need to pull HVAC codes.

or a simple reset.

or check pressures(ahhh! theres an idea).