[W126 Coupe] Air Conditioning Diagnosis

[Dick Spellman]

Dan Landiss wrote:

> Once again I ask this groups combined wisdom for help with my coupe. 

> After all, who knows them better?

>

> The air conditioning season has hit Saint Louis. Mine cools well until 

> the engine warms up, and then I can feel hot air from the heater vents 

> at each end of the dashboard, while cool air is still coming from the 

> vents just below those. Air to the base of the windshield seems to be 

> a mixture of heated and cooled, but hard to tell for sure.

>

> Your opinions? Am I looking at the monovalve, or the dreaded air flap 

> buried under the dash? Maybe something EASY for a change<G>?

>

> Thanks in advance.

>

Hi Dan:

I think you have the following to troubleshoot:

Mono-valve
Vacuum elements (2) on the fresh air/recirc door
Pressures high and low on the refrigerant circuit

What year is the SEC and do you have a passenger air bag?

Regards,

Dick