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Jaimie:
Make sure the check valve on the vacuum supply line is working. If not, you will lose vac on acceleration and the defrost flaps close.
Otherwise, you have leaking rubber connectors on the switchover valve -- all of the right angle ones on the TE were bad when I replaced the evaporator. I would also check the actuators, likely some of them leak as well.
You will need to purchase a MitiVac hand pump for diagnosis.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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