78,000 miles AC blows cold. However, on a longer non-stop trip, after about 1-1/2 hours, the volume and strength of air coming through vents greatly diminishes. Air is still coming through vents, but not enough to cool the car. This problem has started in the last month. I discovered recently that if I pull off the road, and run the heat for awhile, the problem is gone and the AC resumes functioning properly. My initial thought is that something is freezing up constricting air flow through the vents.
Any and all help will be greatly appreciated.
Well you telling me you're on the heat for a while and then the AC works later. Here's the problem. Your evaporator in the dash is freezing up. You've got a problem like the sensor isn't turning the compressor off and it's allowing ice to form on the evaporator. Because when you turn the heat on that melts and then it works for a while. You're having evaporator freeze up and normally that's the sensor on the evaporator
@scottykilmer I reviewed your response with my mechanic. He is ordering the sensor on the evaporator. Surprisingly, it's not an expensive repair. Thank you for the help.
I reviewed your response with my mechanic. He is ordering the sensor for the evaporator. Surprisingly, it's not an expensive repair. Thank you for your help.
The sensor on the evaporator was replaced 5 days ago. The new sensor is from Nissan. It is not an after market part. After driving about an hour today with the AC running, blowing cold air and functioning well, it again lost strength and volume and could no longer adequately cool the car. After then stopping the car for about 1-1/2 hours, the AC was again blowing cold air and functioning properly. What is the next step to try and determine the source of this problem?
Thank you for your help.