My '85 123 has hot flashes when the AC is on. The 134 AC seems to cool well until some component thinks it's time to flake out and then it's 120+ degrees blasting out of the air ducts. Then after about 10 minutes of baking on high heat, the AC cycles back on and cold air returns. It's really annoying.

I was thinking of bypassing the monovalve with a dual valve set-up which would take the heater core out of the loop when I set the valve to bypass. I would add 1 hose between the new bypass and the output which goes to the engine. Yeah, I know this would mean no heat when the valves are in bypass mode, but I'm tired of this gremlin stuff.

Has anyone tried a bypass like what I've described?

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Pete Williams, President emeritus - MBCA-International Stars (Eastern Mich.) Now Wi. & Az.
1985 300D Manual 4 speed Green Hen's tooth
1979 MGB triple black Az car nice
1969 back 1/2 of MGB (Az home built trailer)
1991 Volvo 245 Wagon Nice AZ Restored Gold Brick
1983 Jeep CJ7 37,600 Miles Summer use only