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Old 07-30-2002, 04:14 AM
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Join Date: Feb 2002
Location: queens,new york
Posts: 349
heat in passenger compartment (450sl--1973)

While driving the other day I noticed alot of hot air coming into the passenger compartment.I moved all the a/c levers up ,down,closed but I still can't stop the hot air from coming in. please advise.
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Old 07-30-2002, 10:06 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
On early SLs the heater valve was shut with vacuum controlled by a switchover valve (vacuum relay so to speek), that was controlled by a microswitch at each heater lever. either side asking for heat opened the water valve.

Problems can be the valve, the vacuum, the switchover valve and the micro switches. Make the heater valve go closed or pinch off the flow to evaluate.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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