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Heater tap

Posted: Thu 21 Jun, 2018 1:43 pm
by Testie
1073 SL350 W107. Does anyone have a simple diagram for the vacuum lines from the vacuum tank to the levers and back to the actuators and on to the heater tap?
All the diagrams that I have found on the web are unclear. The tap has been converted to single pipe type with the green hose being plunged up (with golf tee) but still the tap opens at various times, usually on demist.
Any help appreciated.

Re: Heater tap

Posted: Tue 03 Jul, 2018 8:57 pm
by Chai
When the vacuum line to the tap has vacuum, the heater tap is on the OFF position - stopping hot water from flowing.
When there is little/no vacuum in that line, the tap is ON - allowing water to flow through the heater coils.

The heater levers on the control panel are used to both: (a) open the hot air flap at the left or right side depending on the lever moved; and (b) to allow air to leak into the vacuum line when the lever is in the up position.

Moving either of the heater levers up will cause air to leak in the line.