[W126 Coupe] Air Conditioning Diagnosis

[Dick Spellman]

Dan Landiss wrote:

> on 5/10/2007 10:58 AM Dick Spellman wrote:

>> Hi Dan:

>>

>> If you have gauges great.  Then it's read the pressures and outside 

>> air temp compared to the correct refrigerant chart to be sure you 

>> have a full charge.

>

> Thanks, Dick. I dug out the gauges, but cannot find out where to 

> attach the high-pressure side. The low-pressure side drew down to the 

> 25F region, I don't remember the PSI at that point.

>

> In any case, rebuilding the monovalve helped a lot. Cooling is 

> marginal when the ambient is in the 90s, but OK otherwise.

>

Hi Dan:

Hi pressure side should be on the driver's side of the condenser facing 
forward and low near the bumper.  Are you saying you had vent temps of 
25F?  That's too cold and your evaporator will have frozen up.  One of 
the effects of a frozen evap is poor air flow over the colling surface 
where you have ice.  That could mean a bad ETR valve.

Dick