I noticed this on my last road trip: it seems to be connected to the throttle position sensor rather than engine rpm. If you goose it in 6th, even though RPM goes up only a little, the vents blow warmer air for a few seconds...C O D Y said:Yes, it does shut off at WOT reguardless of the RPMs.
I remember that discussion, and since saw a technical service bulletin(?) that says the cars should not be doing that - I haven't bothered to follow up though.McGuireV10 said:About two years ago on the morgue site, a user named luc made a compelling argument that the AC does NOT shut off, it's actually a loss of vacuum pressure. A lot of people disagreed with him, but he insisted that by installing a vac resevoir, he would not lose cool air under any circumstances. I think he even had photos of his setup. At any rate, I seem to recall he had some very detailed instructions. Apparently a resevoir like this is common on other vehicles.
This sounds reasonable to me. In every other vehicle I've ever driven, including those which kill the AC compressor under acceleration, if you turn off the AC the system still blows cold air for at least a few seconds or more. But in the Viper, the switch to hot air is instant and extreme. This suggests to me there is more going on than simple compressor shut-off, which shouldn't interrupt the cold air flow unless it happens for an extended duration. (My Ram will blow cold air for a good five minutes after the AC is shut off.)
All right, I'll do that, gimme a few....but I will be damned if I will order you one! Ya know what I mean, I have some parts here with your name on them, NO SHOW!!!!!! j/kSmokin said:David,
can you take a picture of what youre talking about here so we know which hose youre talking about?
Basic explanation: When you go full throttle your vacuum goes to zero and that lets air door/s close/open in the hvac system. If you install the check valve it will keep the doors where they need to be. Sounds like the compressor could still be engaged (or not)Non Compos Mentis said:so does the A/C shutoff at WOT?
sounds like it does AND there is a loss of pressure which is why it goes hot so quickly. ???
Smokin said:Why wouldnt the factory have caught this issue during testing and after making nearly 12,000 cars with AC?