[W126 Coupe] Air Conditioning Diagnosis

[Dick Spellman]

Dan Landiss wrote:

> on 6/11/2007 6:57 PM Dick Spellman wrote:

>> Please view this link and dependent on the refrigerant you are using 

>> (please let me know) see if your 25psi reading was in spec for 90F 

>> outside on the day you tested low pressure.  Also was the car at idle 

>> or at 1200-1500 rpm when testing?

>

> R12, about an 80F day so the pressure could have been lower. To pull 

> it down that far require raising the RPM to maybe 1500.

>

>> If you can, let me know what the engine coolant was reading too and 

>> when was visco clutch last replaced (miles) and did the electric fan 

>> ever kick on???

>

> Normal coolant, I don't think the electric fan came on (will it, with 

> the bonnet raised?)

>

>> Does compressor stay engaged over say a 10 minute period or is it 

>> cycling on and off with frequency? 

>

> Stays engaged.

>

One last comment Dan.  When you measure ambient air temp, please do so 
just about 2 inches in front of the condenser.  This may show a slightly 
higher temp than what you originally reported but it will be more 
accurate and may prove the pressure/temp readings are not as badly 
skewed as what you reported previously.

Dick