AC issue - quick answer?


Do anyone know if I have to have the AC evacuated when we change out the motor? My ac works and it would be $78 a pound for new r12 + $80 labor (3lbs?)

Can the a/c compresor just be unbolted and the motor put in place then rebolted without r&r the r12? Is there room to do this in the 79 300SD?
I did a search on AC but could not find this info...

I need to do this today if it has to be done... the evac..

Eugene,

You won't disturb the AC system by R&R the motor, but the engine is a different question.

You might be able to remove the compressor from the engine with the hoses attached, thus not losing any freon. I did this on a 220D one time.

If not, you can save the cost of the freon by having an AC shop pump your freon into a tank and reusing it. They pump it into a tank anyway but usually keep it and resell it.

P E H

We are going to try to remove the compresor and get the engine in without losing the coolant...

The shop wants to charge me $89 for labor to refill and $78 per pound for the r-12. They will take my r-12 free though...

Anyone have experence with this?

Thanks!

I bought R-12 on Ebay in Sept., this year, for $11.33 a pound delivered. 15 pound "pony" tank.

Yeah, that was a lucky deal; but..... $78 per pound is RIDICULOUS with an $89 labor charge to put it in. Get a new A/C shop that actually wants your business.

(I assume you mean refrigerant; not "coolant")

__________________
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

THe 79 300SD has all th erefidgerant hoses on the drives side...you can unbolt the compressor from the motor and bungee cord it out of the way....if it was a W123 you would be screwed however.

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

yes you should be able to unbolt that compressor without evacuation

Yes! The AC compressor can be unbolted from the engine and manifold hoses left connected if you are removing the engine. Dave M. (gsxr) did it - click the link below to see.

http://w124performance.com/images/OM603_timing_cover/cleaning2.jpg