Strange A/C Problem
Thread Starter
Team Owner
Joined: Sep 2000
Posts: 25,029
Likes: 2,719
From: Far NW 'burbs of Chicago
St. Jude Donor '13
Strange A/C Problem
Car is a 2017 Z51 A8 2LT, 51k miles.
Never any A/C problems until today.
I had been doing some informal acceleration tests, 0-60 and 20-60. Using transmission in manual paddle shift mode.
A/C was off for all these tests, but turned on between tests and working normally.
On one 20-60 test, A/C off, I accidentally had the tranny in 1st instead of second. Almost immediately after I floored it, of course the engine went into the rev limiter, I got off the gas and upshifted to second. Engine ran fine after that. But a few minutes later I came to a stop, engine still running, and turned on the A/C (hot outside). The A/C was blow blowing hot air and continued to do that for about ten minutes. I shut the engine down for about 20 minutes and looked under the hood, nothing unusual. Restarted, A/C still blowing hot air. Drove for about 15 minutes and the A/C started blowing cold air like it should, and continued working fine for another 100 miles today.
Anyone know what's happening?
Never any A/C problems until today.
I had been doing some informal acceleration tests, 0-60 and 20-60. Using transmission in manual paddle shift mode.
A/C was off for all these tests, but turned on between tests and working normally.
On one 20-60 test, A/C off, I accidentally had the tranny in 1st instead of second. Almost immediately after I floored it, of course the engine went into the rev limiter, I got off the gas and upshifted to second. Engine ran fine after that. But a few minutes later I came to a stop, engine still running, and turned on the A/C (hot outside). The A/C was blow blowing hot air and continued to do that for about ten minutes. I shut the engine down for about 20 minutes and looked under the hood, nothing unusual. Restarted, A/C still blowing hot air. Drove for about 15 minutes and the A/C started blowing cold air like it should, and continued working fine for another 100 miles today.
Anyone know what's happening?
Melting Slicks
Joined: Jan 2015
Posts: 2,106
Likes: 951
From: Fleming Island Florida
My ‘15 had a similar AC issue. While performing a transmission relearn in my garage (with AC off) it blew hot air when I tried to turn it back on. I let it sit for about an hour. When I tried again, it was cooling. The next time I drove it, the AC quit again. Wound up being a failed compressor at approx. 63k miles.
