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Missing A/C electric air valve - 1978 OB

 
Old 12-13-2018, 03:55 PM
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islaTurbine
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Default Missing A/C electric air valve - 1978 OB

I hope this isnít too n00b of a question around here, but searching on here and Google didnít turn up anything for me.

My my car is dropping about 200 rpm during idle whenever the AC compressor kicks on. The idle is currently a bit high so itís not a big problem, but it might become one if I end up adjusting it down to an idle rpm of around ~800 rpms.

Upon further inspection, it looks like the A/C bleed air valve (part number 928-606-215-01) is missing along with all of the associated tubing and wiring that would connect to it. I suspect that this might be whatís causing the idle rpms to not be compensated when the compressor turns on.

Is there a mod out there that would entail removing these components? Im still a bit new around here so there might be a common modification that has this removed. Also, am I on the right track in thinking that having this valve missing will negatively affect idle rpms with the air conditioning on?

The car is a 78 with the 5 speed.

Thanks folks.
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Old 12-13-2018, 04:30 PM
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Rob Edwards
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What's the last 4 digits of your VIN? The early '78s didn't have an aux air valve, not sure when the changeover occurred. #1117 has it, #107 does not.
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Old 12-13-2018, 05:02 PM
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Mine is a Jan. 78 build. #0338. That would explain it!

So if thatís the case, then do these early OBs simply require a higher warm idle to compensate for the AC compressor compared to later 928s?
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Old 12-13-2018, 06:20 PM
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SeanR
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Chuck Schreibers early '79 doesn't have it either.
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Old 12-13-2018, 10:38 PM
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vze2jshn
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Neither does my '78 #342 have the AC auxiliary air valve.
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Old 12-13-2018, 10:41 PM
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Originally Posted by vze2jshn View Post
Neither does my '78 #342 have the AC auxiliary air valve.
Out of curiosity, what is your warm idle rpms with and without the A/C compressor running?
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