[W126 Coupe] Air Conditioning Issues

[Dick Spellman]

Hi Cal:

You'll be happier with a new manifold hose (new ones come with the 
updated vapor barrier).  You will also need the receiver/dryer, o-rings, 
Nylog sealant, PAG 150 oil (assumes you are running R-134 and have the 
Nippo compressor), and either of the (2) sensor/switches that you break 
while removing from the old receiver/dryer (preferably none).  All the 
AC guys recommend changing the expansion valve (got one if you are so 
inclined) but, I've never done one where they are a real PIA to get at 
in the driver's foot well along side the air distribution box on the 
126's.   I'd check with Jonathan or Rusty for the best prices on the MB 
gear (hose, r/d).

If you are doing the R12 to R134 conversion for the first time, I'd look 
at replacing the oil in the compressor (likely 4 oz.) plus the 2oz 
required for the receiver/dryer replacement and evacuating the entire 
system before dropping the required volume of refrigerant in the 
system.  I pick up the 134 schrader adapters for high & low side and a 
small amount of dye to detect future leaks when doing each of my 
conversions.  If you need a link to a great supplier of AC gear and 
know-how I'd try Arizona Air they do it all day long and have an 
Internet store.  Good prices on the vac pumps & guages too.

I've done 3 existing Nippo's and 1 NEW Harrison (AC Delco) A-6 on 
Mercedes.  All run R-134 and I have absolutely no problems staying cool 
in any of them including the black SEC in the 95 + sun/heat when it arrives.

Regards,
Dick

Calvin Young wrote:

>My last visit to the dealer advised that my air conditioner manifold hose is
>leaking.  Anyone have  any experience with replacing this and want to share
>their experience.  How much is the hose, better to repair than replace,
>replace the receiver dryer at the same time, etc.
>
>Cal
>
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