Roachie's 500SL - Mercedes-Benz Forum
 
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post #1 of 6 (permalink) Old 07-19-2019, 06:18 PM Thread Starter
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Date registered: Sep 2012
Vehicle: 1992 500SL
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Roachie's 500SL

HVAC issue. Air only comes out of side vents. Blows hot or cold ok but blend doors don't seem to transfer air flow. Help?
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post #2 of 6 (permalink) Old 07-20-2019, 10:33 AM Thread Starter
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So. I posted originally a while ago. Installed new battery. Lost all dashboard gauges except temp and clock. Have to lower and raise top manually. Pain in the a**. Cannot get front top licks to engage orcdisengage. Same with rear tho once inserted manually it tries and doesn't succeed. Am I clear? What's the solution. Great car. 1992 500Sl with like 95k. Smooth. Quick. Chick magnet. Oops. Not PC
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post #3 of 6 (permalink) Old 07-22-2019, 10:22 AM
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Did you accidentally connect battery wrong way round to start off with?

Check fuses in boot.
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post #4 of 6 (permalink) Old 07-23-2019, 09:04 AM Thread Starter
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replaced all fuses. correlation between top not locking down and losing the dash?
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post #5 of 6 (permalink) Old 07-23-2019, 12:59 PM
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For top troubles on an early 129 I would read/erase codes, operate the top, and read codes again. A procedure for reading/erasing codes is here.

For the vent problem I would first look to see if the input from the control dial is working. For that refer to section "C" of the diagnostic manual ("Test step" 16).
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post #6 of 6 (permalink) Old 07-24-2019, 06:27 AM
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In terms of the vent, this could be an issue with the air pressure system - if faulty you cannot engage the flaps to get air from all outlets (including footwell). Check if all the air tubes are intact in the engine bay, especially the one that is close to the air mass meter.
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