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My heater/ac ducting isn't working 700 1989

posted by  Dave Stevens on  Tue Mar 17 14:47 CST 2020
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last visit: Sun Jan 1 02:36 CST 2012
[RELATED]

I forgot to ask, did you start with the basics to make sure you have vacuum to the servos? Even though the odds are very high you'll find a leaking servo, you will normally still be able to hear a bit of hissing or movement at one of the servos when you operate the heater vent control. You'll want the engine running and maybe blip the throttle to generate extra vacuum (unless a turbo with a vacuum pump). As needed, check that the engine is capable of generating vacuum by pulling the booster hose nipple after running the engine to hear the vacuum released. Verify that the check valve on the firewall that's a couple feet up the vacuum line is working, that the line to it isn't plugged and that there's no damaged or melted vacuum line on the engine compartment side.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now






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