Good afternoon everyone!

So on my 2015 F-Type R my AC has suddenly started to die out over the past couple months. When it blows cold, it's ice cold. Evap temp at 32*. Measuring via OBD scanner. I've evacuated and refilled the freon with the proper amount multiple times. Including yesterday after changing the DPS valve(not fun to do). Which hadn't been done on my car and i suspected was the issue based on problems. Afterward filling with freon the ac was blowing great, until I revved. Once I rev high, the air gets slowly warmer and warmer. Which I can watch on the scanner the evap core goes to ~98 degrees and stays there. Another thing I noticed is as soon as it stops cooling, you can smell it in the air. Smell that the ac has stopped conditioning I mean. I also changed the cabin air filter yesterday, so it's not that. Now I can turn the temp to HI and it really gives me heat, but otherwise it's on LO and just blows hot, but not heater hot. Thoughts?

I tried to include as much information as I could without making this post TOO long. Please ask any questions I will answer the best I can.

Thanks!

 

The car will shut off the AC when you floor it. This is so the drag from the compressor is removed when your trying to get moving quickly. But it should come back on after you let off the gas. Is yours staying hot after you back off the gas pedal?

Or is the compressor kicking out and does not start back turning?

Just a note but your evaporator should never get to 32 F because if it does you will soon have a block of ice. I like to see 34F-35F.
.
.
.

 

Well I can rev while still parked and it does the same thing. In park it won't go over 4k RPM.

32 is the coldest I saw it get to. Doesn't stay there consistently.

​​​​​​​After the cold air cuts out, according to the OBD scanner, the compressor is still running and engaged. But the air coming out is humid and warmer.

 

This is a normal thing at least in my BMW. Heavy accel cuts out A/C because it draws power and if you are WOT then it cuts out the unnecessary stuff to give you want you are asking. Could this be the same situation?

 

4k RPM in park is not WOT throttle though...
my E93 doesn't do this... And even if it does, I'm not WOT long enough to notice the AC is gone... As the EVAP core doesn't get hot enough in the relatively few seconds I hold it at WOT.

Does your BMW AC come back when you are no longer WOT?
​​​​​
​​​​

 

Yes it does come back on after WOT. I had not tested this while in park/neutral and just reving, but I figured the same logic would apply if its WOT. Ive read our F-Types have a limiter for 4k RPM for reving, so I disregarded that factor in my reference. I have no concrete answer for our Jags, but here is the reference below on M3 forums for AC turning off on WOT.

https://www.m3post.com/forums/showthread.php?t=847108

 

First off, love M3s. 👍🏽

Second... Ok so I just had the gauges hooked up to the Ftype while sitting where it was parked all night and it was cooling with pressures at 40psi low side and 225psi high side. Evaporator temp at 39*. It's 97* in Houston today.

Stayed happy there as long as I was in idle.

Revved up to 3k for about 30 seconds... Low side didn't move much but high side went over 260... Then both needles dropped. High to about 175. Low went to 60 and started bouncing from 60-70, without stopping. Turned off AC switch, compressor turned off. Hi and Low Pressures started slowly dropping. Turned on compressor, high went back to 175 and low back to 60-70 bounce mode. Evaporator temp slowly climbed to 102. I can not figure out what the heck is going on. When she's cold she cold and when she quits she's hot and so am I.

Help?
​​​​​

 

Yeah thats not at all what triggers the compressor turn off on the Bimmer. Nothing I can comment on anymore, maybe another forum member will chime in, but I bet its gonna be a mechanic type of situation for fixing.

Good luck!

 

Yes that is the factory rev limiter in park or neutral that limits engine speed.
Are you aware of the DPS (Direct Pressure Sensing) valve problems?
It's pretty common but I have not repaired or seen it yet myself.
Attached are some things to fix it.
.
.
.

 

Good morning, yes definitely, that after multiple ac evac refill cycles was what I determined was the issue. I was rather surprised that literally after changing the valve it exhibited exactly the same behavior. Now I'm leaning towards the expansion valve because navigator literally yesterday decided it wanted that to die as well. Horrible reasoning, I agree. Coincidence, most likely. But there isn't too much more that I can think of on the F-Type that could be wrong, only under 20k miles.

Thank you for chiming in, actually those documents are what I read several times before doing the valve replacement, for a dealer sourced part nonetheless.