A/c behave weird - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Legend@wheels · 08-02-2019, 07:59 AM

Hi
Ive not driven my car for few months .
When i just drove it today ive noticed that the ac compressor kicks on and off by itself at idle.
Cant remember that it was like this before ,is it normal or its a new behaviour?
720rpm normal and when it kicks in it decrease to 650 for 2secs and raise again till next time it stops and works again .
(kicks on and off every 20secs)

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Boomerang · 08-02-2019, 08:27 AM

Normal

brzboy · 08-02-2019, 08:51 AM

Mine does it

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Ultramaroon · 08-03-2019, 12:18 AM

Sell your cars before they puke their guts.

Mr.ac · 08-03-2019, 03:18 AM

Quote:

Originally Posted by Ultramaroon

Sell your cars before they puke their guts.

Car is clearly falling apart. Don't even bother trying to sell it. Burn it to the ground. The longer you wait the more likely it's going to end up kill you and those around you.

You should buy a new 2019 Honda Civc Si.
It out handles and out preforms your crusty car any day all day long.
Am I right or am I right?

tomm.brz · 08-03-2019, 03:55 AM

Normal

Ultramaroon · 08-03-2019, 01:56 PM

Ok, I lied. It's normal.

Actually, for science, try this. while you're idling or in a situation where the compressor is cycling on and off quickly, crank up the cabin fan all the way. You'll notice that it starts running continuously. What's happening?

There's a thermostat in the system that controls how cold the evaporator is allowed to get. It will easily freeze f there's not enough hot air being pushed through it. The thermostat says "ok, that's enough. Gimme a sec." and the compressor shuts off.

That's what you notice. Normal and more importantly, healthy operation. If you didn't have enough refrigerant, or if something was wrong with the compressor, it would never cycle. Now, if it cycles and doesn't blow cold, that's a different story. That is an unlikely failure mode but it can happen.

Legend@wheels · 08-03-2019, 02:11 PM

Quote:

Originally Posted by Ultramaroon

Ok, I lied. It's normal.

Actually, for science, try this. while you're idling or in a situation where the compressor is cycling on and off quickly, crank up the cabin fan all the way. You'll notice that it starts running continuously. What's happening?

There's a thermostat in the system that controls how cold the evaporator is allowed to get. It will easily freeze f there's not enough hot air being pushed through it. The thermostat says "ok, that's enough. Gimme a sec." and the compressor shuts off.

That's what you notice. Normal and more importantly, healthy operation. If you didn't have enough refrigerant, or if something was wrong with the compressor, it would never cycle. Now, if it cycles and doesn't blow cold, that's a different story. That is an unlikely failure mode but it can happen.

Kewl thx
None of my cars does/did that thats why i was wondering.
Cheers guys

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ermax · 08-03-2019, 03:37 PM

It cycles every 20secs or so even while moving it’s just not as noticeable.

solidsnake11 · 08-03-2019, 04:46 PM

Also may be a little low on freon.

Ultramaroon · 08-03-2019, 06:51 PM

Quote:

Originally Posted by solidsnake11

Also may be a little low on freon.

It would have to be very low on refrigerant and would cycle as, or more quickly with the blower on max.

08-02-2019, 07:59 AM	#1
Legend@wheels nenber Join Date: Nov 2018 Drives: BRZ Location: ISRAEL Posts: 97 Thanks: 63 Thanked 22 Times in 20 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	A/c behave weird Hi Ive not driven my car for few months . When i just drove it today ive noticed that the ac compressor kicks on and off by itself at idle. Cant remember that it was like this before ,is it normal or its a new behaviour? 720rpm normal and when it kicks in it decrease to 650 for 2secs and raise again till next time it stops and works again . (kicks on and off every 20secs) Sent from my SM-G960F using Tapatalk

08-03-2019, 12:18 AM	#4
Ultramaroon 義理チョコ Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,868 Thanks: 52,132 Thanked 36,520 Times in 18,921 Posts Mentioned: 1106 Post(s) Tagged: 9 Thread(s)	Sell your cars before they puke their guts. __________________ service manuals

08-03-2019, 01:56 PM	#7
Ultramaroon 義理チョコ Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 31,868 Thanks: 52,132 Thanked 36,520 Times in 18,921 Posts Mentioned: 1106 Post(s) Tagged: 9 Thread(s)	Ok, I lied. It's normal. Actually, for science, try this. while you're idling or in a situation where the compressor is cycling on and off quickly, crank up the cabin fan all the way. You'll notice that it starts running continuously. What's happening? There's a thermostat in the system that controls how cold the evaporator is allowed to get. It will easily freeze f there's not enough hot air being pushed through it. The thermostat says "ok, that's enough. Gimme a sec." and the compressor shuts off. That's what you notice. Normal and more importantly, healthy operation. If you didn't have enough refrigerant, or if something was wrong with the compressor, it would never cycle. Now, if it cycles and doesn't blow cold, that's a different story. That is an unlikely failure mode but it can happen. __________________ service manuals

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08-02-2019, 08:27 AM	#2
Boomerang 86 Join Date: May 2016 Drives: 2015 Toyota GT86 MT UEL E85 RSR CWP Location: Perth, Western Australia Posts: 3,293 Thanks: 3,553 Thanked 4,850 Times in 2,166 Posts Mentioned: 28 Post(s) Tagged: 0 Thread(s)	Normal

08-02-2019, 08:51 AM	#3
brzboy Member Join Date: Jun 2019 Drives: 2016 brz limited Location: Murphy no Posts: 33 Thanks: 15 Thanked 4 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Mine does it Sent from my iPhone using Tapatalk

08-03-2019, 03:55 AM	#6
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,196 Thanks: 500 Thanked 1,067 Times in 775 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	Normal

08-03-2019, 03:37 PM	#9
ermax Senior Member Join Date: Sep 2017 Drives: 2022 BRZ Limited Silver Location: Jacksonville, FL Posts: 2,532 Thanks: 882 Thanked 2,045 Times in 1,188 Posts Mentioned: 68 Post(s) Tagged: 0 Thread(s)	It cycles every 20secs or so even while moving it’s just not as noticeable.

08-03-2019, 04:46 PM	#10
solidsnake11 Senior Member Join Date: Nov 2018 Drives: brz Location: nc Posts: 318 Thanks: 431 Thanked 739 Times in 443 Posts Mentioned: 24 Post(s) Tagged: 0 Thread(s)	Also may be a little low on freon.

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