You have other problems. The Gen II 126's are easily capable of delivering vent temps in the mid 40s in our heat with the stock system running R134a. You have a poor charge, a leaking monovalve, or a recirculation flap that isn't closing.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]

The mono valve is brand new from low millage donor car, I took out the dash a month ago, replaced the felt on all doors and vacuum pods, rubber elbows, the suction return hose is just cool not cold at all, I saw online some members reported great results using propane mix from enviro-safe, bought the kit and the same result. I am planning to install a valve on the heater to prevent hot coolant from getting inside the car in the heater core, I don't know where yet to put it, on the manifold gauges i am getting 40PSI low - 200PSI height

Aftermarket monovalves are known to be bad in these cars. Get a nerw one from Mercedes.

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To see my 129 parts for sale visit:
http://stores.ebay.com/The-Mercedes-SL-Store
John Roncallo

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