This post is of special interest for Country Coach Owners with the Country Coach installed bus air.

My existing AC compressor was tired after many years of running with only one of two electric condenser fans working and operating at excessive discharge temperatures. The AC compressor leaking case is result of high temperatures stressing the AC compressor case (per Omega). Now the cooled suction (from the evaporators) refrigerate temperature is approx 66 degrees and the discharge temperature is 202 degrees. These temperatures were taken at the compressor suction and discharge manifolds.

I replaced the OTR AC compressor with a new TM-31 ordered from Omega Systems ($1,126.00). The compressor came with PAG oil for R-134A, so I drained the oil and replaced with mineral oil compatible with refrigeration systems. After replacement of the compressor, I pressure checked the system for five days @250 PSI, no leaks. Then evacuated the system and recharged with R-12. My results are outstanding! I took a few pictures of the particulars so other Country Coach owners can see my statistics. I also replaced both electric condenser cooling fans (One was not operating when I refurbished the system.

My bus air is working great!


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I charged the system on a cool day, outside temps 60 - 70 degrees. My suction pressure ended at 18 psi, with a discharge pressure of 140 PSI. Since I was using R-12 refrigeration, I charged the system until the return refrigeration from the condenser (Viewed at the sight glass on top of the dryer) was 'bubble free' and 'liquid clear'.

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The discharge temperature at the galley evaporator was a brisk 33 degrees. I am sure I will appreciate that temperature this summer.

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This is a shot of the new condenser fans installed. I did remove the condenser assembly to replace the fans. This is a shot of the condenser assembly, with new fans mounted under the bus.

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The new AC compressor mounted. I like it!