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Automotive AC Tech's- I need help!!

1981K20

Up North
Joined
May 19, 2020
Member Number
369
Messages
219
Loc
North of MT but south of AK
Sick of dealing with 'technicians' that have zero clue about troubleshooting AC and was hoping the vast knowledge of IBB techs might help out lol

Spent more than I'd like to admit on my AC in a 2001 ram diesel.. new compressor, evaporator, truck radiator and AC recharge within the last 2 years. AC is great when moving and shortly after start up but slowly fades unless moving at highway speeds. At a stop I have about 3-5 mins before the AC fades rapidly and the truck temp increases, but won't (or hasn't yet) overheat.

Any ideas????
 

Wolfe_Man

Don't Label Me!
Joined
May 19, 2020
Member Number
242
Messages
183
Loc
Apple Valley CA.
Sounds like an airflow issue. I agree with above, check your fan clutch. It can be enough flow to keep engine cool but not enough airflow over condenser to have AC work properly.
 

ThePanzerFuhrer

The Rock Breaker God
Joined
May 19, 2020
Member Number
84
Messages
2,144
Loc
Wi
Did you lose any of the shrouding around the fan or between the condenser and radiator?
 

BIG-O

Well-known member
Joined
May 20, 2020
Member Number
809
Messages
109
Did you flush the condenser real good after the compressor change? Did the compressor scatter? Black death? Pull a good vacuum? Air/moisture in the system will drop it's efficiency drastically.
 

1981K20

Up North
Joined
May 19, 2020
Member Number
369
Messages
219
Loc
North of MT but south of AK
Did you flush the condenser real good after the compressor change? Did the compressor scatter? Black death? Pull a good vacuum? Air/moisture in the system will drop it's efficiency drastically.

I had a long standing local shop do the replacement but I should've mentioned that the condenser was changed when the compressor was replaced as said shop had highly recommended to replace it. This truck tows my shit south twice a year and I do not cheap out on it.

I'm going to replace the clutch fan this weekend with an OEM one. Thanks to the replies I googled some troubleshooting and it appears fucked. Not sure why AC tech near my work didn't catch on to that but I'm glad I declined his offer to 'dig deeper into the issue'

Thanks again for the replies 🍺
 

Pythias

New member
Joined
Nov 9, 2021
Member Number
4537
Messages
1
I had a long standing local shop do the replacement but I should've mentioned that the condenser was changed when the compressor was replaced as said shop had highly recommended to replace it. This truck tows my shit south twice a year and I do not cheap out on it.

I'm going to replace the clutch fan this weekend with an OEM one. Thanks to the replies I googled some troubleshooting and it appears fucked. Not sure why AC tech near my work didn't catch on to that but I'm glad I declined his offer to 'dig deeper into the issue'

Thanks again for the replies 🍺
this get fixed?

fan clutch the issue?
 

Levigarrett76

Zeus of the Sluice
Joined
May 20, 2020
Member Number
631
Messages
326
Loc
GA
How dirty is your radiator / intercooler?

The stupid stock ccv on the 99-02 24v is too short and dumps the vapor in the fan area and dirt builds up over time as a result of oil all over the radiator/intercooler and restricts flow.

IMG_7581.JPG
 

MigGunslinger

Red Skull Member
Joined
May 21, 2020
Member Number
909
Messages
365
Loc
Sacramento
My experience has been the opposite. The cheap ones don't disengage as readily.
Been down that road, it's neat to be cruising at freeway speeds and using 20hp to spin a fan unnecessarily.

You pay for the proper fan clutch because you want it to disengage under the right conditions.
 
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