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A vacuum leak can cause this...You may have a vacuum leak if the vents are not working properly. Don't overlook the mono-heat valve. It will cause the heat to kick in or not come on at all at random.
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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM
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