Here goes. In Volvo's infinite wisdom, if there is a MAF failure, will some logic or programming in a control unit prevent from loading the engine with the AC compressor?

My MAF is reading 0.0 on my scanner and this happened the same day the AC stopped working.

I have a new MAF on the way and don't want to put the car in the shop for AC work if the MAF issue is resonsible.

(Klaus, you've already told me this is a coincidence and I trust you. I've just seen stranger things happen in my line of electronic, IT and mechanical systems work.)

Thanks,

ER

Hold off on the AC until the MAF is replaced. I know, it is hot down there! But it could be possible that the 2 issues are related, just seems far fetched. Like the rear O2 sensor being disabled with a MAF failure??? Why?
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Keeping it running is better than buying new

Too late but I'm curious. The car was in the shop today and they found two things with the AC. First, it was down to half a pound of refrigerant when about 1.5 lbs is needed. They charged it but the compressor still wouldn't come on.

Tracing the circuit the tech found a blown 15A fuse in an engine management circuit. Replacing that brought the AC back online! So, I'm very curious now to scan and if the MAF signals are being read since it was an engine management circuit at fault.

I will certainly let you know. If it did fix the MAF issue I'll just return the unit I ordered, or keep it for a spare.

Erwin

Here it is! First off the AC was down a pound of refrigerant so they topped that up to the 1.5lb spec. Compressor still wouldn't engage. They traced the problem to a blown 15A fuse, number 37 in the engine bay fuse panel. AC blows cold now. Curious is that they said the fuse was an "engine management" circuit so arriving home I pulled the manual out and found that this fuse protects:

Engine sensor to valves, A/C relay, PTC element oil trap, Charcoal filter (purge valve?) AND the Air Mass Sensor!

I still had the CEL and the power was still soft so I scanned and cleared all the codes which killed the CEL, the P0102, the various misfire codes, etc. Took the car for a drive and all the engine power is back and the AC blows cold. It was a fuse. I had checked the 10A compressor fuse which was good but overlooked the other.

So maybe I was right in a way. Not from a programming but a hardware standpoint. If the fuse for the other engines systems blows, the AC is prevented from running and futher loading the compromised engine.

Fuses blow for a reason though so I'm half expecting this to recur, hoping that it was a fluke.

Learning a new used car is as always, a treat.

Erwin