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Matthew, HVAC Technician
Category: HVAC
Satisfied Customers: 2014
Experience:  14 years experience in the HVAC field of service, installation, Manual J & D calculations
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I have a Rheem RRGG 07N448JKR heater/AC unit. The AC still

Resolved Question:

I have a Rheem RRGG 07N448JKR heater/AC unit. The AC still works but after the unit has been running for a while the air flow ( air blowing into the central air vents into our house ) slowly decresases to nothing. I let the unit cool for about an hour and we get fan again but it will slowly stop blowing. I found my air filters had collapsed and that the air being funneled into the unit was not being filtered. We have dogs and cats-lot of hair.
What should I do?

thanks for your help

Mikr Franceschini
Submitted: 7 years ago.
Category: HVAC
Expert:  Matthew replied 7 years ago.

Hello, My name is XXXXX XXXXX I will do my best to help you today.


Your system is more than likely freezing up. This is caused by low refrigerant charge, dirty filter or coil underbelly (the animals would cause this), or the blower isn't running at all. When a system freezes the "A" coil on top of the furnace literally freezes over so the air will not pass through it. Then when you turn the system off it thats and air starts passing through it again.


A good tech can put the gages on the outdoor unit and tell the difference between a low refrigerant charge and a dirty coil.


Cleaning an indoor coil is no easy task and it is not recommended to try without the experience of doing it before. The copper refrigerant lines are very brittle and one false move and you are replacing a coil instead of just cleaning it.

Edited by Matthew on 7/20/2010 at 6:53 PM EST
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