A/C intermittently works

[banetranch]

I can be driving an the A/C is blowing nice an cold then it will start blowing warm air. Later I can turn it on then it will blow cold again. It has done it 3 times in the last week? Any ideas????

 

[asahi4runner]

The evaporator has frozen and it triggered the low side pressure switch and caused the compressor to kick off.

 

[banetranch]

What is the fix?

Where should I start looking? thanks

 

[nissanh]

When AC is blowing cold, check the temperature of the high side all the way to the engine firewall. It should be hot, and be careful. When there is no cold blowing, do the same thing. IF you feel hot all along the high side all the way to the firewall, no clogs in the AC system upto the firewall.

Use a high blower speed and see whether you runs into the same problem.

 

[banetranch]

high blower

I have had it on the high blower side an thats when it started to blow ambient air. Are you saying that the pipe should be hot?? Also ad there is no
dripping inside the passenger side ( not sure if that helps)

 

[banetranch]

When the unit is running cold the top pipe is cold, the bottom smaller one is semi cool.
It has not started to run hot air yet but will give you an update when it does.
Does that sound right?