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Re: '87 Climate Control Question

> In my '87 5KCSTQW the climate control system is getting, has been 
> somewhat erratic. Surprised? Anyway, I get Econ, Bilev and Auto through 
> the top and low vents only and not through the dash vents now though 
> occasionally it will come back on through these for Econ and Auto. This 
> is for AC operation btw.

Funny, my 86 is doing something VERY similar.  Mine will blow air thru the
dash vents on Auto, but as soon as the boost guage reads 0.8, goodbye cold
air!  I'm suspecting the vacuum check valve or perhaps a vacuum leak
somewhere in the center vent circuit.