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AC line freezing up. Forums > > AC line freezing up. AC line freezing up.
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  #1  
Old 04-29-2012, 02:37 PM
greenmgcmk greenmgcmk is offline
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2005 Altima
2004 Murano
 
Join Date: Jul 2008
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Default AC line freezing up.

While driving from NC to FL the air stopped working. We pull over to buy some R134A, and the low side hose is frozen. After going into walmart and spending 20 mins we come back to find the hose is thawed out and the ac works perfectly. What would cause this and is this a problem that is going to come back?
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  #2  
Old 04-30-2012, 07:47 PM
Nissan2007 Nissan2007 is offline
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2007 Maxima
 
Join Date: Apr 2012
Posts: 62
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Quote:
Originally Posted by greenmgcmk View Post
While driving from NC to FL the air stopped working. We pull over to buy some R134A, and the low side hose is frozen. After going into walmart and spending 20 mins we come back to find the hose is thawed out and the ac works perfectly. What would cause this and is this a problem that is going to come back?
Generally speaking, freezing up in any AC system can happen for several reasons:

1) a defective thermal expansion valve (TXV). Since it takes a while for ice to form, and it will often melt after the evaporator is blocked long enough for the temperature to riseabove freezing, the air conditioner seems to work intermittently.

2) A failing AC compressor can cause the same symptoms (if a variable compressor gets stuck at full stroke), failed receiver dryer can cause similar symptom (desicant blocks TVX or evap core)

3) if the car has had a refrigerant leak, moisture in the refrigerant can freeze inside the evaporator, causing a blockage.

4) be sure condensate drain is not blocked, and make sure cabin air filter is not blocked/dirty and not plugged with leaves.

5) If system is overcharged, freezing can happen.

What has been done to the AC system prior to this, service-wise?
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  #3  
Old 05-01-2012, 05:57 AM
greenmgcmk greenmgcmk is offline
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2005 Altima
2004 Murano
 
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there has been no service to the ac system. the ac is working now and has not frozen up again.
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  #4  
Old 05-09-2012, 02:50 AM
naijaboy naijaboy is offline
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2007 Altima
 
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It's your A/C thermostat malfunctioning.
It should cut off the compressor via cycles to prevent freezing.
It will happen again
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  #5  
Old 05-09-2012, 01:14 PM
greenmgcmk greenmgcmk is offline
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2005 Altima
2004 Murano
 
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How could I test this? Is it hard to get to?
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