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Toyota AC stops working, starts again
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cynnosure
New User
May 20, 2009, 7:13 AM
Post #1 of 7
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Toyota AC stops working, starts again
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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. If I am just starting the car and the sun has been beating down on the dash, the AC blows only cool, never cold. I have filled the freon and had the same result. If I am in the shade, or at night, the AC blows cold. This last time, on a long trip, the AC worked fine until it got hotter and the sun was overhead hitting the dashboard. The AC actually started blowing 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 and had the AC worked on 5 different times with no results. Does anyone know what causes this, I was thinking that maybe it's a Toyota issue. Do they have some kind of thermostat in the dash?
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Hammer Time
Ultimate Carjunky
/ Moderator
May 20, 2009, 7:28 AM
Post #2 of 7
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Re: Toyota AC stops working, starts again
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I don't think it has too much to do with the dashboard except for the increased load on the system. It sounds like the system may be freezing up due to possibly a faulty thermostat in the evaporator case. You would really need to put some pressure gauges on it when the problem is present to determine just what is happening at the time.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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cynnosure
New User
May 20, 2009, 9:13 AM
Post #3 of 7
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Re: Toyota AC stops working, starts again
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Do you mean the expansion valve? or is there an actual thermostat in the evaporator case?
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Hammer Time
Ultimate Carjunky
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May 20, 2009, 1:52 PM
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Re: Toyota AC stops working, starts again
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Yes, there should be a thermostat with a probe that inserts right into the evaporator that shuts the compressor off if the temp drops too low to prevent freeze up.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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May 21, 2009, 3:10 PM
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Re: Toyota AC stops working, starts again
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To add and just gotta ask some questions: Is compressor staying engaged?
Just how and why did you "fill with freon?" If overfull it will cut out from excessive pressures.
Are fan(s) working?
Can you get gauge readings?
If outer hub is cycling off and air goes warm on you - you may have a compressor clutch air gap that's excessive.
There's a lot more to MVAC (Motor Vehicle Air Conditioning) than meets the eye. I'm sure Hammer Time agrees with me on that one!
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Hammer Time
Ultimate Carjunky
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May 21, 2009, 3:49 PM
Post #6 of 7
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Re: Toyota AC stops working, starts again
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Tom's right,
The sunlight related info had me jumping to conclusions.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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May 22, 2009, 4:35 AM
Post #7 of 7
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94 Toyota Camry AC stops working, starts again
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Hammer - we aren't there as you know and could miss something obvious if we were.
I was thinking clutch air gap. I don't bother with the feeler gauge any more and the spec is about .020. Can be checked by folding a standard biz card and while folded almost impossible to get into the gap. Open card should fall right thru it but I find it ok to be in the close side but not rubbing.
Not proven by me but of interest: Steel is MORE magnetic colder (what I've been told) and the clutch is an electro magnet. Can't say what % is gained or lost by each 10F degree increments but it exists! Molten iron/steel like the slag from cutting off exhaust parts won't pick up with a magnet! That's an extreme of course.
Also: Some (Thought non Toyotas though) seriously need voltage regulator (alternator) to hold close to 14v while running or won't engage clutches! That's one that fools the best of 'em!
Since we don't have pressures I think in this case the HPCO (high pressure cut out) or a thermal cut out is shutting down compressor as designed as we don't know how much refrigerant is in this or what the pressures are.
Long winded Tom
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