Car airconditioner problem
#1
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Car airconditioner problem
MY air condtion gets cold some of the time but not others. At times it will be cool and them a humid smell starts just before it gets warm. I have put the coolant in there before but nothing changed. At times it goes out and will start back up, but that is rare.
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i am not a toyota guy.
but it sounds like the evaporator could be freezing over.
thus-the humid smell / then warm
'might' be a thermal switch on the evap.
might be low on freon.
but it sounds like the evaporator could be freezing over.
thus-the humid smell / then warm
'might' be a thermal switch on the evap.
might be low on freon.
#5
All of the automotive HVAC compartments I've seen (admittedly only a few) have all of the air blowing through the evaporator (regardless of the desired temperature) and the there is a blend door that directs air over the heat exchanger if heat is called for.
I would think that if the evaporator is freezing over that the air volume through the vents would be reduced significantly. Is this the case here?
Is the compressor cycling on & off frequently with the A/C on or does it mostly stay on?
I don't know if these have TXVs or fixed orifices (probably the latter) or where they are, but if the orifice is BEFORE the evaporator (as they commonly are), check the temperature of the high and low side lines right where they connect to the evaporator (usually on the passenger side of the car near the firewall). They should both feel cold.
I'd put my money on a slightly low refrigerant charge causing the A/C compressor to cycle on and off.
- Joe
I would think that if the evaporator is freezing over that the air volume through the vents would be reduced significantly. Is this the case here?
Is the compressor cycling on & off frequently with the A/C on or does it mostly stay on?
I don't know if these have TXVs or fixed orifices (probably the latter) or where they are, but if the orifice is BEFORE the evaporator (as they commonly are), check the temperature of the high and low side lines right where they connect to the evaporator (usually on the passenger side of the car near the firewall). They should both feel cold.
I'd put my money on a slightly low refrigerant charge causing the A/C compressor to cycle on and off.
- Joe
#6
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All of the automotive HVAC compartments I've seen (admittedly only a few) have all of the air blowing through the evaporator (regardless of the desired temperature) and the there is a blend door that directs air over the heat exchanger if heat is called for.
I would think that if the evaporator is freezing over that the air volume through the vents would be reduced significantly. Is this the case here?
Is the compressor cycling on & off frequently with the A/C on or does it mostly stay on?
I don't know if these have TXVs or fixed orifices (probably the latter) or where they are, but if the orifice is BEFORE the evaporator (as they commonly are), check the temperature of the high and low side lines right where they connect to the evaporator (usually on the passenger side of the car near the firewall). They should both feel cold.
I'd put my money on a slightly low refrigerant charge causing the A/C compressor to cycle on and off.
- Joe
I would think that if the evaporator is freezing over that the air volume through the vents would be reduced significantly. Is this the case here?
Is the compressor cycling on & off frequently with the A/C on or does it mostly stay on?
I don't know if these have TXVs or fixed orifices (probably the latter) or where they are, but if the orifice is BEFORE the evaporator (as they commonly are), check the temperature of the high and low side lines right where they connect to the evaporator (usually on the passenger side of the car near the firewall). They should both feel cold.
I'd put my money on a slightly low refrigerant charge causing the A/C compressor to cycle on and off.
- Joe
#7
How much refrigerant did you put in? Too much is just as bad (if not worse) than too little. The total system charge in ounces should be printed under the hood somewhere.
Is the compressor cycling on & off frequently with the A/C on or does it mostly stay on?
- Joe
Is the compressor cycling on & off frequently with the A/C on or does it mostly stay on?
- Joe