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A/C Issues - Blowing Hot Air #4487126
08/13/17 08:17 AM
08/13/17 08:17 AM
Joined: May 2011
Posts: 83
Florida
afree Offline OP
afree  Offline OP

Joined: May 2011
Posts: 83
Florida
I went to drive the IS300 today and the A/C was blowing hot air. It was working perfectly fine the previous time I drove it (which was about a month ago). I'm hoping it just needs a recharge since it was sitting for a while and working perfectly before. Anyways, I used a gauge that came with a recharge can and it showed that the pressure was high with the A/C on. The clutch does visibly engage and disengage when the A/C is turned on and off respectively so I'm wondering why the gauge shows the pressure being so high on the low side port. The gauge shows high when the A/c is on and off, which has be concerned because the 'Ez Chill' instructions state to take it to a mechanic if it shows high with the A/C on. Does the Lexus/Toyota/IS300 compressor have a special feature which won't let the compressor turn on if its low on refrigerant? The sight glass near the headlight doesn't show bubbles (or possibly nothing at all). Would a simple recharge solve this issue or is there a mechanical issue with the compressor?

If the refrigerant and peg is low, any DIY solutions which don't involve those off-the-shelf leak sealer refrigerants?

Thanks!!


2004 Lexus IS300 5-speed 2JZ-GTE VVT-i
2015 Toyota Tacoma Crew Cab TRD Sport 4x4 LB 1GR-FE
Re: A/C Issues - Blowing Hot Air [Re: afree] #4487128
08/13/17 08:21 AM
08/13/17 08:21 AM
Joined: Sep 2015
Posts: 1,691
USA
mk378 Offline
mk378  Offline

Joined: Sep 2015
Posts: 1,691
USA
It may have a variable displacement compressor which is stuck at zero displacement. If there is saturated pressure on the low side that doesn't drop when the compressor starts, something is wrong with the compressor.

Some high-end Toyotas had a suction throttling valve in between the evaporator and compressor, which does about the same thing as a variable compressor. If you're measuring the pressure before the valve, it could be stuck closed.

In any case, it is not a lack of refrigerant.

Last edited by mk378; 08/13/17 08:24 AM.
Re: A/C Issues - Blowing Hot Air [Re: afree] #4487158
08/13/17 09:30 AM
08/13/17 09:30 AM
Joined: May 2011
Posts: 83
Florida
afree Offline OP
afree  Offline OP

Joined: May 2011
Posts: 83
Florida
From my research, the IS300 has a duel pressure switch (which I assume it means that the compressor won't turn on if the pressure is too high or too low?). Would the high pressure still indicate a faulty compressor?


2004 Lexus IS300 5-speed 2JZ-GTE VVT-i
2015 Toyota Tacoma Crew Cab TRD Sport 4x4 LB 1GR-FE
Re: A/C Issues - Blowing Hot Air [Re: afree] #4487164
08/13/17 09:41 AM
08/13/17 09:41 AM
Joined: Sep 2015
Posts: 1,691
USA
mk378 Offline
mk378  Offline

Joined: Sep 2015
Posts: 1,691
USA
You said that the compressor does turn on though. So the pressure is OK to start the compressor.

The pressure is supposed to change after the compressor starts. You said it does not do that.

If all the refrigerant leaks out, the switch will open and the compressor won't turn on. In a TXV system which is almost certainly what you have, the switch stays closed at all times in normal operation.

Re: A/C Issues - Blowing Hot Air [Re: afree] #4487217
08/13/17 10:51 AM
08/13/17 10:51 AM
Joined: Aug 2009
Posts: 592
Modesto,CA
mehullica Offline
mehullica  Offline

Joined: Aug 2009
Posts: 592
Modesto,CA
If the system has not had a recharge before & the low side is high with the AC on, then the compressor shaft is probably broken & the gauge reading you see is the normal static pressure of 70-85 psi. Both high & low sides are the same psi. Does the AC button led blink when the system is on? If it is blinking, then the compressor revolution sensor sees not rotation of the shaft & will disengage the clutch.

Re: A/C Issues - Blowing Hot Air [Re: afree] #4487353
08/13/17 01:26 PM
08/13/17 01:26 PM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline

Joined: Jan 2007
Posts: 17,501
Clovis, CA
The high and low sides should be equal with the engine off and then the low side should drop when the compressor cycles on. My static pressures are a 110psi both sides when it over a 100F ambient.

Re: A/C Issues - Blowing Hot Air [Re: afree] #4487618
08/13/17 05:38 PM
08/13/17 05:38 PM
Joined: Dec 2006
Posts: 1,023
midwest
JamesBond Offline
JamesBond  Offline

Joined: Dec 2006
Posts: 1,023
midwest
Does the gauge move at all when wn the ac goes from off to on? I wouldn't use one of those recharge cans if they have leak sealers or non specific oil.

Re: A/C Issues - Blowing Hot Air [Re: afree] #4487687
08/13/17 06:36 PM
08/13/17 06:36 PM
Joined: May 2011
Posts: 83
Florida
afree Offline OP
afree  Offline OP

Joined: May 2011
Posts: 83
Florida
I didn't notice it move at all. Stayed constant.

I just don't see the a/c working one time then a month later the compressor going out.

Last edited by afree; 08/13/17 06:38 PM.

2004 Lexus IS300 5-speed 2JZ-GTE VVT-i
2015 Toyota Tacoma Crew Cab TRD Sport 4x4 LB 1GR-FE
Re: A/C Issues - Blowing Hot Air [Re: afree] #4487706
08/13/17 06:51 PM
08/13/17 06:51 PM
Joined: Sep 2015
Posts: 1,691
USA
mk378 Offline
mk378  Offline

Joined: Sep 2015
Posts: 1,691
USA
It is indeed a variable compressor. They do that. Any auto part can break at any time.

Re: A/C Issues - Blowing Hot Air [Re: JamesBond] #4488770
08/14/17 09:25 PM
08/14/17 09:25 PM
Joined: Dec 2006
Posts: 1,023
midwest
JamesBond Offline
JamesBond  Offline

Joined: Dec 2006
Posts: 1,023
midwest
Do the underhood fans come on when you turn on the ac? If the pressure is too low the compressor will not turn on. Poke the schraeder valve to see if there is any refrigerant in the system (use caution).

Re: A/C Issues - Blowing Hot Air [Re: JamesBond] #4492611
08/19/17 08:31 AM
08/19/17 08:31 AM
Joined: May 2011
Posts: 83
Florida
afree Offline OP
afree  Offline OP

Joined: May 2011
Posts: 83
Florida
Originally Posted By: JamesBond
Do the underhood fans come on when you turn on the ac? If the pressure is too low the compressor will not turn on. Poke the schraeder valve to see if there is any refrigerant in the system (use caution).


Yes the fans do come on. Should I poke the pin the in the high or low schrader valve?

As someone else asked, the AC light does not flash.


2004 Lexus IS300 5-speed 2JZ-GTE VVT-i
2015 Toyota Tacoma Crew Cab TRD Sport 4x4 LB 1GR-FE
Re: A/C Issues - Blowing Hot Air [Re: afree] #4492615
08/19/17 08:35 AM
08/19/17 08:35 AM
Joined: Sep 2015
Posts: 1,691
USA
mk378 Offline
mk378  Offline

Joined: Sep 2015
Posts: 1,691
USA
Originally Posted By: afree
Should I poke the pin the in the high or low schrader valve?

Neither. You already checked pressure with a gauge and found that there was plenty.

Take the car to a qualified mechanic. Brace yourself that it probably needs a new compressor.

Last edited by mk378; 08/19/17 08:38 AM.
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