AC will not stay cold?

Tiny
BLAMMMS
  • MEMBER
  • 1995 TOYOTA CAMRY
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 140,000 MILES
When we put ac on it blows cold air for about 5 mins or less then turns warm. I put gauge on to check freon and it shows full? It happens all the times on real hot days? On cooler 70 degree days it stays colder a little longer?
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Thursday, July 29th, 2010 AT 8:48 AM

41 Replies

Tiny
RASMATAZ
  • EXPERT
This sounds like the system is low on charge these videos can help fix it.

https://youtu.be/uZrQCGwXfek

and

https://youtu.be/4UjfQKvrB6Y

Could be freezing up due to air and moisture blocking off the orifice tube and needs vacuuming out-
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Friday, May 29th, 2020 AT 3:16 PM
Tiny
BLAMMMS
  • MEMBER
How do you clean it or vacuum it? Wheres it located?
Thanks
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Friday, May 29th, 2020 AT 3:16 PM
Tiny
RASMATAZ
  • EXPERT
You need a vacuum pump-best just birng it in
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Friday, May 29th, 2020 AT 3:16 PM
Tiny
BLAMMMS
  • MEMBER
Brought in twice and they did not solve problem. I would like to do myself but cannot find drain tube?
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Friday, May 29th, 2020 AT 3:16 PM
Tiny
CYNNOSURE
  • MEMBER
  • 1994 TOYOTA CAMRY
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
I have a 1994 Camry and every time I forget to put up my sun shade or I am on a longer trip, and the sun is shining hot on the dashboard, the air conditioner stops working. This last time it actually blew hot air. I turned the AC off, stopped the car and waited for 40 minutes. When I started the car again, the AC blew very cold. My mother had a Lexus that had a similar problem. Is this a Toyota issue?
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Friday, November 27th, 2020 AT 8:47 AM (Merged)
Tiny
ANDY650
  • MEMBER
I had a similar problem, Camry 95 AC not working when hot. The problem was the "Fan speed" control on the dashboard. I discovered that when wiggling the knob the fan was turning on and off even if the knob remained in the "Auto" position. By removing the switch and disassembling it and carefully cleaning the switch the AC now appear to work all the time regardless of ambient temperature and wiggling the knob doesn't affect the fan speed. Time used was about 1.5 hours including figuring out how to disassemble the dashboard panel to remove the climate controls. Note there appear to be different types of climate systems in the Camry models. Mine has the push buttons for air flow selection and the fan speed control has OFF, AUTO and Low to High.
Hope this helps.
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Friday, November 27th, 2020 AT 8:47 AM (Merged)
Tiny
SZALKUSKT
  • MEMBER
  • 1993 TOYOTA CAMRY
  • 2.2L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
A/C clutch and fans initially started clicking on and off quickly along with the fans and also the light in control button blinking and corresponding warm and cold air from vents. I am a mechanic and I am pretty certain no refrigerant has leaked out as I have dye in my system and I monitor/inspect my car three times weekly and no leaks visually. There is still pressure at valve core fittings when slightly pressed to check. With possibly no refrigerant escaping out and the clutch clicking on and off until now, not at all. I need help to troubleshoot.
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Friday, November 27th, 2020 AT 8:48 AM (Merged)
Tiny
WRENCHER1
  • EXPERT
Just because you cannot see dye visually does not mean you do not have a leak. Evacuate and recharge is the only way to confirm capacity.

Those older Toyota's are tricky because they use an rpm sensor in the compressor and a module in the control head to monitor it. They do not store any codes and are very tricky to diagnose. The rpm sensors in the compressors fail often causing the AC button to start flashing. Turning it off and back on usually restarts it until it triggers again.
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Friday, November 27th, 2020 AT 8:48 AM (Merged)
Tiny
SZALKUSKT
  • MEMBER
The one thing I forgot to mention is that the green light in the control button does not even come on or flash at all and that was one of the first things I noticed. Do you have an electrical schematic for the A/C system? What is the control head? Also, for example if I evacuate the system and try to refill it and the compressor clutch with not engage due to something faulty. How can I fill it? Is it possible you can help me troubleshoot the electrical portion of the system a little first? Verify some of the electrical items first? I would like a little help with that first.
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Friday, November 27th, 2020 AT 8:48 AM (Merged)
Tiny
WRENCHER1
  • EXPERT
If you are using a recovery machine to evacuate and recharge as you should be, it will charge with the engine off.

If you have no light on the AC button, then your issue is electrical. First thing to do is test the fuses with a test light and make sure the control head is getting power. The control head is the switch assembly inside. If that light is not lighting up, then the switch is not working for some reason.

Before I can get you a wiring diagram I need to know if you have push button controls or levers.
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Friday, November 27th, 2020 AT 8:48 AM (Merged)
Tiny
SZALKUSKT
  • MEMBER
The A/C switch is a button only. The temperature, vents etc, are all dials and a lever for the re-circulation/outside air. Yes, thanks I need help checking the fuses and electrical.
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Friday, November 27th, 2020 AT 8:48 AM (Merged)
Tiny
WRENCHER1
  • EXPERT
Here is your wiring diagram. It appears this one uses an amplifier (module) also.
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Friday, November 27th, 2020 AT 8:48 AM (Merged)
Tiny
SZALKUSKT
  • MEMBER
Is there a better way to attach the image of the diagram? I am having a hard time reading it. It seems to be small. Is the rpm sensor on it? Also, I do know that before my A/C clutch completely stopped working the clutch and fans would energize simultaneously. Possibly both fans not one. But I do know that the fans turned on and off abruptly/quickly as well as the clutch. Also at this time the A/C button green light would not illuminate but the switch did turn on and off the clutch/fans.
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Friday, November 27th, 2020 AT 8:48 AM (Merged)
Tiny
WRENCHER1
  • EXPERT
There is nothing I can do about the size. The site shrinks it down automatically. You may have to save it to you computer and then enlarge it. The tachometer sensor is inside the compressor in the lower right of the diagram.
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Friday, November 27th, 2020 AT 8:48 AM (Merged)
Tiny
SZALKUSKT
  • MEMBER
This is the kind of control panel I have. I still do not understand what they mean by push button or lever type. I was able to find a diagram online and there are two different diagrams like you said, one for push button and one for lever type and I am not sure what they mean. That is why I took a picture of my control panel.
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Friday, November 27th, 2020 AT 8:48 AM (Merged)
Tiny
SZALKUSKT
  • MEMBER
My car is a 2.2 L, 5S-FE engine.
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Friday, November 27th, 2020 AT 8:48 AM (Merged)
Tiny
WRENCHER1
  • EXPERT
I gave you the correct diagram. You have lever type. This picture is what the push button type would look like.
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Friday, November 27th, 2020 AT 8:48 AM (Merged)
Tiny
SZALKUSKT
  • MEMBER
I looked at my relay under hood by the air cleaner, drivers side front. Relay looks like it was cycling on and of a lot because it was blackened a little on the contact area. I removed it and checked it with battery voltage and a test light and the coil is working and allows power to transfer through and holds. Also, I have a 1992 parts car with lever type and I took that relay from the parts car and installed it and no difference. I did notice that the parts car AC switch light works even with or without the relay installed so that leans me towards the AC switch in dash control panel because my car initially had the problem of only the AC light not coming on, but AC system worked fine and AC blowing cold. I did hold down contact of the exposed relay with engine running and AC compressor clutch came on and air started to come out cold quickly.
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Friday, November 27th, 2020 AT 8:48 AM (Merged)
Tiny
WRENCHER1
  • EXPERT
The relay operates the compressor clutch, not the control head.
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Friday, November 27th, 2020 AT 8:48 AM (Merged)
Tiny
SZALKUSKT
  • MEMBER
Schematic I have also.
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Friday, November 27th, 2020 AT 8:48 AM (Merged)

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