A/C work

[Scorpius01]

I have done ALOT of work to my kids 1990 q45.
During summer the AC would blow fine in the morning, but ambient temp in the summer afternoon heat.
Hi side was 400psi lo side as high as the gauge would read, when I acted up.
-fan working and coming on.
-Airflow across condenser.
-noted icing on the line from expansion valve to compressor.
Expansion valve sticking open, found out this was an aftermarket part replaced from previous owner……was able to get a Nissan one. One win.

[VStar650CL]

Nice work. For those reading, anytime a Nissan/Infiniti A/C works fine when you first turn it on, stops working after awhile (especially if the ambient is hot and humid), then works again if you shut it off for a few minutes, suspect a bad expansion valve (TXV). What's happening is that the stuck valve is dumping too much refrigerant into the evaporator, which causes a freeze at either the TXV outlet or the evap itself. Shut down the system for a few minutes and the ice melts, and suddenly the A/C works again.

Anyway, nice job.

[Dbarry]

Nice work. For those reading, anytime a Nissan/Infiniti A/C works fine when you first turn it on, stops working after awhile (especially if the ambient is hot and humid), then works again if you shut it off for a few minutes, suspect a bad expansion valve (TXV). What's happening is that the stuck valve is dumping too much refrigerant into the evaporator, which causes a freeze at either the TXV outlet or the evap itself. Shut down the system for a few minutes and the ice melts, and suddenly the A/C works again.

Anyway, nice job.

Good info! We'll see if that's the issue in this new Infiniti project.