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940 Needs to blow colder 900

posted by  spook on  Fri Jun 10 09:48 CST 2005
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last visit: Fri Oct 24 08:06 CST 2014
[RELATED]

Dear D.J.

Good p.m. and may this find you well. Hot water is only supposed to go through the heater core, when you want heat in the passenger cabin.

The heater valve, actuated by hose-supplier vacuum, opens and closes, in response to settings on the Climate Control Unit (CCU). A number of vacuum lines go to the CCU. Those lines go to vacuum "motors", which are rubber bellows. When the air is sucked out, that opens and closes the plastic "doors" in the air handling system.

Vacuum line can be bought from the dealer, or from an auto supply place. Be sure you get the right diameter.

The vacuum leak, which you likely have only partly patched, indeed could account for air flow changes, that you have not "ordered", by moving the selector knob, in the center of the CCU's front panel.

Hope this helps.

Yours faithfully,

spook






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