A/C makes RPMS drop and compressor shuts off - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Aydrian · 06-15-2019, 04:23 AM

[URL="https://youtu.be/McL8R0XWi5U"]If the car is a neutral the compressor will come on and off and it will continuously do that as long as the car stays neutral also the RPMs dip and the car wants to stall I got the expansion valve changed but it was no help anyone know what this issue could be? Another thing is while this is happing the AC air comes out hot and I live in Vegas so the inside of the car gets hot extremely fast.
COMPRESSOR :

RPM:

tomm.brz · 06-15-2019, 05:26 AM

normal stock tune behaviour

Beachin86 · 06-15-2019, 02:15 PM

There's a TSB for idle RPM dip. If you take it to the dealer with a printout of the TSB (they're on the forums here, just search), it might get rid of this for you. I think it was on the earlier model years though, do if you have a 2015 and up, it might not apply.

Sent from my Pixel using Tapatalk

Aydrian · 06-15-2019, 02:48 PM

You think if I go to the dealer and take the paper they'll fix it even if my car is salvage? and it is a 2015 :/

RZNT4R · 06-15-2019, 02:54 PM

Quote:

Originally Posted by Aydrian

You think if I go to the dealer and take the paper they'll fix it even if my car is salvage? and it is a 2015 :/

A tsb is "diagnostic help", not a recall or warranty extension. They'll fix it if you pay them to fix it.

Ultramaroon · 06-15-2019, 04:06 PM

Don't sweat the idle dip. Something is still wrong with the AC system. The compressor shouldn't be cycling so quickly.

Mr.ac · 06-15-2019, 07:05 PM

Well, if the ac is blowing hot air it means it out of cooling juice. There could be a leak somewhere.

I would take it to any ac shop. It's way less than what a dealership will cost.

As for the rpm dip, that's kind of normal for '13-14' cars. Mine does that too and it's been that way since I bought it. Zero problems though. But like others said there is a tbs on it.

sato · 06-15-2019, 07:12 PM

Quote:

Originally Posted by tomm.brz

normal stock tune behaviour

I also think this is pretty normal on our cars. Like somebody else stated, there was a TSB for earlier cars and was already applied in my unit.

Some advice, make sure that throttle body is clean to avoid making it worse.

radroach · 06-15-2019, 07:13 PM

You might need a new A/C relay. Saying this because I have an ES330 that exhibited behavior, A/C would run but the light would start blinking and it would shut off when idle, a problem with the magnetic clutch relay, not sure if applicable on these cars so asking around. And switching out the relay ($50) fixed it.

Re-check the fuses, should be a 50A fuse if what I'm reading from other threads: https://www.ft86club.com/forums/showthread.php?t=101733

Kodename47 · 06-15-2019, 07:51 PM

You can swap the horn relay to see whether it's not holding, easy thing to test in a couple of mins. Tendency is for them to stick so it works intermittently, that's what's happened to a few others and mine. I think you can rule out a fuse as that would cause it to stop running altogether. It certainly shouldn't be cycling that quickly, so it may be gas pressure.

Relays are in the fuse box under the bonnet.

Aydrian · 06-15-2019, 08:57 PM

I figured out my car has no cabin air filter in it so I'm going to buy it doubt it will do anything but just to be safe, the thing is the A/C works when the car is driving its cold but when I stop it gets hot and start to cycle the compressor non stop. sometimes it works fine when the car is warming up but after a little drive it starts to do it.

humfrz · 06-15-2019, 09:45 PM

Quote:

Originally Posted by Aydrian

I figured out my car has no cabin air filter in it so I'm going to buy it doubt it will do anything but just to be safe, the thing is the A/C works when the car is driving its cold but when I stop it gets hot and start to cycle the compressor non stop. sometimes it works fine when the car is warming up but after a little drive it starts to do it.

Like suggested, I'd still have the A/C serviced.

humfrz

Ultramaroon · 06-15-2019, 10:23 PM

The AC evaporator is downstream. The fast cycling of the compressor fits as a symptom of an evaporator suffering from dramatically reduced airflow.

Aydrian · 06-15-2019, 11:29 PM

Quote:

Originally Posted by Ultramaroon

The AC evaporator is downstream. The fast cycling of the compressor fits as a symptom of an evaporator suffering from dramatically reduced airflow.

What would I do to fix this?

06-15-2019, 04:23 AM	#1
Aydrian Member Join Date: May 2019 Drives: 2015 Black Scion Fr-s Location: Las Vegas Posts: 12 Thanks: 1 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	A/C makes RPMS drop and compressor shuts off [URL="https://youtu.be/McL8R0XWi5U"]If the car is a neutral the compressor will come on and off and it will continuously do that as long as the car stays neutral also the RPMs dip and the car wants to stall I got the expansion valve changed but it was no help anyone know what this issue could be? Another thing is while this is happing the AC air comes out hot and I live in Vegas so the inside of the car gets hot extremely fast. COMPRESSOR : RPM: Last edited by Aydrian; 06-15-2019 at 01:18 PM.

06-15-2019, 04:06 PM	#6
Ultramaroon not playing cards Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,395 Thanks: 53,053 Thanked 37,228 Times in 19,308 Posts Mentioned: 1117 Post(s) Tagged: 9 Thread(s)	Don't sweat the idle dip. Something is still wrong with the AC system. The compressor shouldn't be cycling so quickly. __________________ service manuals

06-15-2019, 07:05 PM	#7
Mr.ac [insert cool phrase here] Join Date: Aug 2015 Drives: BRZ Premium Location: Central Coast CA Posts: 2,368 Thanks: 709 Thanked 1,559 Times in 930 Posts Mentioned: 30 Post(s) Tagged: 0 Thread(s)	Well, if the ac is blowing hot air it means it out of cooling juice. There could be a leak somewhere. I would take it to any ac shop. It's way less than what a dealership will cost. As for the rpm dip, that's kind of normal for '13-14' cars. Mine does that too and it's been that way since I bought it. Zero problems though. But like others said there is a tbs on it. __________________ New daily driver - Subaru BRZ Premium Weekend fun/track car - '91 MR2 Turbo Gen3 Old daily driver - '88 MR2 Supercharged

06-15-2019, 07:51 PM	#10
Kodename47 Senior Member Join Date: Oct 2012 Drives: UK GT86 Location: UK Posts: 3,040 Thanks: 185 Thanked 1,633 Times in 1,113 Posts Mentioned: 156 Post(s) Tagged: 1 Thread(s)	You can swap the horn relay to see whether it's not holding, easy thing to test in a couple of mins. Tendency is for them to stick so it works intermittently, that's what's happened to a few others and mine. I think you can rule out a fuse as that would cause it to stop running altogether. It certainly shouldn't be cycling that quickly, so it may be gas pressure. Relays are in the fuse box under the bonnet. __________________ .: Stealth 86 :. Abbey Motorsport/K47 Tuned Sprintex 210 Supercharger Kodename 47 DJ: Soundcloud / Instagram / Facebook

06-15-2019, 08:57 PM	#11
Aydrian Member Join Date: May 2019 Drives: 2015 Black Scion Fr-s Location: Las Vegas Posts: 12 Thanks: 1 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I figured out my car has no cabin air filter in it so I'm going to buy it doubt it will do anything but just to be safe, the thing is the A/C works when the car is driving its cold but when I stop it gets hot and start to cycle the compressor non stop. sometimes it works fine when the car is warming up but after a little drive it starts to do it. Last edited by Aydrian; 06-15-2019 at 09:29 PM.

06-15-2019, 05:26 AM	#2
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,279 Thanks: 515 Thanked 1,121 Times in 811 Posts Mentioned: 70 Post(s) Tagged: 0 Thread(s)	normal stock tune behaviour

06-15-2019, 02:15 PM	#3
Beachin86 Senior Member Join Date: Jul 2017 Drives: FR-S 10 Series Location: Los Angeles, CA Posts: 137 Thanks: 193 Thanked 82 Times in 58 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	There's a TSB for idle RPM dip. If you take it to the dealer with a printout of the TSB (they're on the forums here, just search), it might get rid of this for you. I think it was on the earlier model years though, do if you have a 2015 and up, it might not apply. Sent from my Pixel using Tapatalk

06-15-2019, 02:48 PM	#4
Aydrian Member Join Date: May 2019 Drives: 2015 Black Scion Fr-s Location: Las Vegas Posts: 12 Thanks: 1 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	You think if I go to the dealer and take the paper they'll fix it even if my car is salvage? and it is a 2015 :/

06-15-2019, 07:13 PM	#9
radroach Senior Member Join Date: Feb 2013 Drives: car Location: usa Posts: 2,162 Thanks: 1,028 Thanked 867 Times in 530 Posts Mentioned: 35 Post(s) Tagged: 1 Thread(s)	You might need a new A/C relay. Saying this because I have an ES330 that exhibited behavior, A/C would run but the light would start blinking and it would shut off when idle, a problem with the magnetic clutch relay, not sure if applicable on these cars so asking around. And switching out the relay ($50) fixed it. Re-check the fuses, should be a 50A fuse if what I'm reading from other threads: https://www.ft86club.com/forums/showthread.php?t=101733

06-15-2019, 10:23 PM	#13
Ultramaroon not playing cards Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,395 Thanks: 53,053 Thanked 37,228 Times in 19,308 Posts Mentioned: 1117 Post(s) Tagged: 9 Thread(s)	The AC evaporator is downstream. The fast cycling of the compressor fits as a symptom of an evaporator suffering from dramatically reduced airflow. __________________ service manuals

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