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'70 280S-'73 450SLC-'81 380SL-'84 500SEC Euro-'92 300SL24-'95 E320
985 Posts
Discussion Starter · #1 ·
Is the heater control valve on the '81 unique? I see repair kits for '82 and up. I am getting a slow bleed of hot air through the defrost vents with the HVAC system totally shut off.

· Premium Member
2010 Mercury Milan Hybrid, 1993 BMW 325i convertible
6,080 Posts
Is the heater control valve on the '81 unique?
If by unique you mean "awkward and horrendously expensive to fix", then yes - it's very unique. I have the same setup in my 78.

The heater control valve is called a servo, and it sits in the engine compartment, up near the firewall on the passenger side. Under the dash is a climate control amplifier. You should change both of them at the same time, but they do cost some money. The servo is around $500 delivered, and the amp is another $100 on top of that.

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1973 450 SLC AMG, 1995 Chevy Tahoe
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