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MCC vacuum control to heat valve: not necessary? 900

posted by  montysano on  Sat Oct 8 08:49 CST 2011
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last visit: Thu May 29 16:46 CST 2014
[RELATED]

Good morning Brickboarders,

Now that the heater core on my '94 940 is successfully replaced, I've turned my attention to an apparently non-functioning heat valve. I can't feel any vacuum at the line that controls the valve. Operating the heat control at the MCC makes no difference.

I read on another post that the valve is only closed during engine warm-up and is normally open after that (regardless of whether you're using heat), and that the amount of heat delivered to the passenger compartment is controlled elsewhere. Is this accurate?

What happens if I eliminate the valve?

Failing that, should I try running a new vacuum line from the MCC to the valve?

Thanks,

Monty
--
Past: '79 245, '91 240, '88 245. Current: '90 245, '83 245, '95 940






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