Does this sound like the monovalve?


Car starts.. AC works great until the car is stopped for a short period of time. 30-60 minutes. Then the AC blows hot air for a variable amount of time. Usually 15 -30 minutes in traffic. It will cool down quicker if you get up to speed.

Am I on the right track here?

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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.