A/c cuts out above 90 mph ? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

pjp · 09-13-2017, 11:01 AM

Air conditioner cuts out above 90 mph,
starts working after slowing down?

JazzleSAURUS · 09-13-2017, 11:13 AM

I have to wonder, are you really concerned about the AC at 90mph? Do you normally cruise at 90mph and get frustrated that it's not nice and cool?

If I was going that fast, I'd want the AC to shut off to free up power, and release the load of the A/C on the cooling system.

8RZ · 09-13-2017, 11:21 AM

Just drive at 89 mph.

pjp · 09-13-2017, 11:23 AM

Yes I cruise at 85 to 90 all the time, with cruise control on most of the time!
Last week driving through the big valley it was 107*F so yes A/C On!!

pjp · 09-13-2017, 11:26 AM

Eng Temps were Fine .
Six gear cruising Along

KDad2 · 09-13-2017, 11:54 AM

Quote:

Originally Posted by 8RZ

Just drive at 89 mph.

I don't know about that. Every time I get up to 88 mph, I see some serious shit.

humfrz · 09-13-2017, 12:14 PM

Quote:

Originally Posted by pjp

Yes I cruise at 85 to 90 all the time, with cruise control on most of the time!
Last week driving through the big valley it was 107*F so yes A/C On!!

What valley do you call the "big valley" ...... ??

The A/C compressor will cut off under extreme load ........ maybe, at those speeds, the engine considers itself under extreme load .......

humfrz

JazzleSAURUS · 09-13-2017, 12:24 PM

Quote:

Originally Posted by humfrz

What valley do you call the "big valley" ...... ??

The A/C compressor will cut off under extreme load ........ maybe, at those speeds, the engine considers itself under extreme load .......

humfrz

Do you know if that's vacuum or RPM based?

Calculated engine load v. user demand.

Darth Khan · 09-13-2017, 12:30 PM

Open the window, this will do three things:

1. Cool the cabin down.
2. Generate increased cabin noise.
3. Cause the cars drag coefficient to increase slowing it down allowing the air A/C to come back on.

strat61caster · 09-13-2017, 12:37 PM

Quote:

Originally Posted by humfrz

What valley do you call the "big valley" ...... ??

The A/C compressor will cut off under extreme load ........ maybe, at those speeds, the engine considers itself under extreme load .......

humfrz

lol you know California's Central Valley. Not much has changed since you first visited I'd wager.

Interesting to hear it shuts off at 90, I could see that happening going up a hill (due to high load as mentioned before) but surprised it happens on flat level roads. Maybe dropping down to 5th will reduce the load via gearing and allow you to stay cool?

strat61caster · 09-13-2017, 12:42 PM

Quote:

Originally Posted by Darth Khan

Open the window, this will do three things:

1. Cool the cabin down.

You've never driven in 110 degree heat have you?

Darth Khan · 09-13-2017, 12:46 PM

Quote:

Originally Posted by strat61caster

You've never driven in 110 degree heat have you?

Yes, but I was having some fun, suggesting dropping below 90 is mundane.

Imrac · 09-13-2017, 12:48 PM

Could it be the 110 Degree heat being forced in via high pressure area where the cabin intake is and overwhelming the evaporator?

Try turning on cabin recirculate to shutout air from the outside. Otherwise it's possibly the ECU turning off the AC unit due to load/demand.

mazeroni · 09-13-2017, 12:57 PM

Quote:

Originally Posted by pjp

Air conditioner cuts out above 90 mph,
starts working after slowing down?

Eh, couldn't verify if my car does this. I have very few opportunities to go more than 90 on the interstate, and in those rare situations, someone usually slows me down sooner rather than later.

If it has happened to me, the cabin would have already been cold, so I probably never realized it was happening.

09-13-2017, 11:01 AM	#1
pjp Member Join Date: Feb 2014 Drives: frs Location: so cal Posts: 48 Thanks: 0 Thanked 7 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	A/c cuts out above 90 mph ? Air conditioner cuts out above 90 mph, starts working after slowing down?

09-13-2017, 11:13 AM	#2
JazzleSAURUS Senior Member Join Date: May 2015 Drives: 15 BRZ LTD, 05 FXT Location: Western MA Posts: 1,032 Thanks: 561 Thanked 558 Times in 351 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	I have to wonder, are you really concerned about the AC at 90mph? Do you normally cruise at 90mph and get frustrated that it's not nice and cool? If I was going that fast, I'd want the AC to shut off to free up power, and release the load of the A/C on the cooling system. __________________ SOLD: 2015 WRB BRZ Limited ('02 WRX BBS, S-04's, Stoptech Sport pads, MXP SP, AVO drop in filter, Mishimoto Intake tube, decatted header, OFT 93 Stage 2 EL Tune, Kartboy rear shifter bushing, Whiteline transmission and subframe lockout bushings, ST Coilovers, SPC Camber bolts w/smaller crash bolt, SPC LCA's & SPC Toe Arm bushings, Red TOMs, TRD Wing.)

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09-13-2017, 11:23 AM	#4
pjp Member Join Date: Feb 2014 Drives: frs Location: so cal Posts: 48 Thanks: 0 Thanked 7 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Yes I cruise at 85 to 90 all the time, with cruise control on most of the time! Last week driving through the big valley it was 107*F so yes A/C On!!

09-13-2017, 11:26 AM	#5
pjp Member Join Date: Feb 2014 Drives: frs Location: so cal Posts: 48 Thanks: 0 Thanked 7 Times in 6 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Eng Temps were Fine . Six gear cruising Along

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