Two questions: AC works fine...but no heat. Should I try to replace mono-valve before I proceed to items like heater core?

Cold start is fine. Hot start requires pumping of gas pedal. Is this possibly a relay or regulator problem?

Thanks for your help!!!

I went through prior HEATER threads and found the advice on the MonoValve...it worked!!!! An easy repair.

Now, I am hoping that the Fuel Accumulator solves the next problem!!

Thanks!!

Well.....the monovalve worked for the heat. AND,,,the fuel accumulator worked for the hot start problem!

What a boon this Shop Forum is!

Now, I have to solve a engine cutting problem....guess I'll try the Overload Protection Relay...and the Fuel Pump Relay. Thanks to all the Senior members for their knowledge and help.

Your two for two! Nice going. I really like it when the resolution gets posted when the problem is solved. Thanks.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)