Air Conditioning Pump

[Paul Champagne]

Just noticed on my 2000 Thunder C12 Cat that the AC pump clutch has seized up, as I could smell it burning when I started my coach .

Has anyone had a similar problem, and is it repairable, or do I need to order a new part from Cat or Beaver?

Right now everything is fine, as long as I don't turn on the AC switch, also how expensive is the part?

Thanks

Paul

[Richard And Babs Ames]

Any good AC repair point should be able to fix your problem. We have replaced three over the years.

[Gerald Farris]

Paul,
Your problem is not the A/C clutch, but it is actually that the A/C compressor is seized. You will need to have the A/C compressor replaced and the system recharged.

The A/C compressor is not a Caterpillar part and Monaco will charge way more for it than it is worth. So the best solution is your local supply point for automotive A/C parts if you can evacuate and recharge the system yourself after replacement, or just take it to an automotive A/C repair shop that you can trust. They will be able to get all of the necessary parts.

Gerald  

[Richard And Babs Ames]

You should replace the dryer and expansion valve also when you replace the compressor. EPA regulations makes it impossible for the DIY person to comply depending on the refrigerant used.

[Gerald Farris]

There is nothing in the EPA regulations that prevent a do-it-yourself mechanic from servicing the dash air on a 2000 model coach. All that you need is basic A/C tools (including vacuum pump and gauges) plus an understanding of how the system is designed and how it functions.

With a compressor replacement, I would not automatically replace the expansion valve unless you are sure that it is restricted because of the fact that it is almost impossible to access on a 2000 Thunder. The receiver/dryer on the other hand is accessible and should be replaced if there are any signs of contamination in the system.

Gerald

[JimCasazze]

If you need a suitable replacement compressor, you might want to look at an ICE (International Components Engineering) 2521493  HD truck compressor.   Also, there are a few other threads on dash a/c and dash ac compressors that you might wish to look at.  The dash wiring diagrams are on the old Beaver Technical site as well.
Jim

[Richard And Babs Ames]

Thanks for the info on the freon Gerald I do not know what was used as some like r22 requires a recovery system. Our mechanic used a brand of compressor he liked better. I do not know brand or spec but the. System does seem more efficient.

[Jeremy Parrett]

A non-working condenser fan allowed the freon to overheat and blow the seals out of the compressor.  This then seized, which caused the clutch to fail. Might be a good idea to check the operation on your condenser fan!  I can hear it from the drivers seat, with the door open.