ok now this has me really boggled. my thermostat is fine reading just over 80c. got a new temp dial,new blower motor even a new switching block or whatever you call it but check it out, I can get heat from the car sometimes really hot, sometimes luke warm however if my rpm's go over 4g on the tach the heat shuts off completely and will not come back on until I turn off the car and restart it which now; cause its cold consists of pulling over popping the hood and pushing the stop button. obviously a vacume problem there. but would the vac have any effect on the heat? I would love to hear some analysts on this one. it's getting pretty cold to drive 60 miles a day with out heat.
thank's for any ideas

j