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  #1  
Old 06-13-2007, 10:55 AM
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W108 Evaporator R&R

Does the W108 (72 280SE in this case) AC evaporator need to be removed as a unit? In other words, does the housing come out with the coil installed or do you remove the box bottom (condensate pan) and drop the coil out of the box?
I am overhauling the AC and finding it very difficult to get the evap coil in and out. PO must have had the same problem and busted the evap housing in six pieces. I had no air from the vents yet the blower would suck your hand if you got close to its inlet. I discovered the air was escaping thru a 4" hole busted out on top of the housing.
I've pulled the box, glued it back together then layed fiberglass cloth/resin over it. Not sure if I can get the coil back in without breaking it again. It's a tight squeeze...
I'm too old to be laying over the door threshold this long. Getting all beat up with this job.

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Old 06-13-2007, 05:46 PM
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Not a popular job I guess.
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Old 06-13-2007, 05:58 PM
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I doub't any Mercedes Evap is ever a popular job

Out of curiosity what do you mean by getting the coil back in? Is that the radiator type thing inside the evap box?

- Peter.
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Old 06-13-2007, 09:26 PM
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Quote:
Originally Posted by pj67coll View Post
I doub't any Mercedes Evap is ever a popular job

Out of curiosity what do you mean by getting the coil back in? Is that the radiator type thing inside the evap box?

- Peter.
Yes, The coil of copper with aluminum fins. Thirty two passes of copper tubing to be exact. The evap measures roughly 14" wide by 8" tall by 4" deep. It's pretty large and is more than adequate to cool the cab I'd think.

The bottom of the box that houses the evaporator coil is easily removed once you remove the passenger kick panel then the blower.
The evaporator coil will drop out of the box. The difficult part is the freon lines going thru the firewall. The box has to be flexed to get the coil in place. Its a pretty tight fit.

To be honest, my AC is undergoing a serious modification. I am using an orifice tube type expansion device. The hi side entering the evaporator will be accessible on the engine bay side of the firewall. I have a few different size tubes to play with to get the most efficient cooling.
The receiver/drier in the hi side will be replaced with an accumulator on the suction side. The accumulator I'm using is a $24 GM part. GM R4 compressor pumping R134.

My fingers are crossed...

Hardest part is getting the evap in and out. I was just wondering what the standard procedure for the job entails.
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Old 06-14-2007, 12:55 PM
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Progress report

The evaporator and condensor coils are connected with new hi side line sitting on the deck in the back yard.
I've cap one end and terminated the other with a guage. It's holding steady at 100psi. I'll let it set for a while and then vacuum, purge and cap the ends before its all installed back in the car.
I have pics I'll try to post. Need to resize or park them somewhere.
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Old 06-14-2007, 01:39 PM
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Change your condenser to a parrallel flow if you want the 134a to cool the car...
Personally I'd stick to R12 but here we go again with another R12 / R134a / 409 / Freeze- whatever / propane debate...

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