intermittent AC prolem - Ford Explorer Ranger Enthusiasts "Serious Explorations"®

r book · 05-20-2006, 06:16 AM

Hello all, I'm a new member and need help with intermittent blower problem.
My AC works fine for about 20 to 30 minutes then it seems the duct gate slowly starts to close until I get no air from the vents even though the blower is working fine. Was wondering if this is a possible vacum problem.
I'm really stumped on this and my wife would really like to have her AC working. Thanks in advance for any help you can offer.
RBook

*Brock94* · 05-23-2006, 01:47 PM

It sounds like your evaporator is freezing up. There should be a temperature sensor that shuts off your compressor if the evaporator gets too cold-- that could be malfunctioning. If your evaporator gets below freezing, the condensation from the air will freeze onto it and block the airflow.

r book · 05-23-2006, 06:31 PM

Thanks for the reply Brock. I think you're right on target. Should have thought
of that myself. GuessI'll get a low pressure switch and see if that does it.
Thanks again, Randy

**BrooklynBay** · 05-23-2006, 07:13 PM

The pressure switch is made to cut out the compressor if you are low on freon. It is not temperature controlled. Did you check those small, cylinder shaped check valves that look like a black, and white disk with 2 small vacuum fittings?

**BrooklynBay** · 05-23-2006, 09:17 PM

Here is a picture of that check valve:

05-20-2006, 06:16 AM	#1
r book Wannabe Elite Explorer piggott,AR 94 xlt Join Date: May 2006 Posts: 2 Vehicle Specs	intermittent AC prolem Hello all, I'm a new member and need help with intermittent blower problem. My AC works fine for about 20 to 30 minutes then it seems the duct gate slowly starts to close until I get no air from the vents even though the blower is working fine. Was wondering if this is a possible vacum problem. I'm really stumped on this and my wife would really like to have her AC working. Thanks in advance for any help you can offer. RBook

05-23-2006, 01:47 PM	#2
Brock94 Elite Explorer Milford, CT 1994 XLT Join Date: Jul 2004 Posts: 587 Vehicle Specs	It sounds like your evaporator is freezing up. There should be a temperature sensor that shuts off your compressor if the evaporator gets too cold-- that could be malfunctioning. If your evaporator gets below freezing, the condensation from the air will freeze onto it and block the airflow. __________________ Not by might, nor by power but by my Spirit. What are you, O great mountain? -God

05-23-2006, 06:31 PM	#3
r book Wannabe Elite Explorer piggott,AR 94 xlt Join Date: May 2006 Posts: 2 Vehicle Specs	follow up AC problem Thanks for the reply Brock. I think you're right on target. Should have thought of that myself. GuessI'll get a low pressure switch and see if that does it. Thanks again, Randy

05-23-2006, 07:13 PM	#4
BrooklynBay Aerostar Forum Moderator Brooklyn, NY 88 89 93 95 96 Aerostars Join Date: Nov 2005 Posts: 29,026 Vehicle Specs	The pressure switch is made to cut out the compressor if you are low on freon. It is not temperature controlled. Did you check those small, cylinder shaped check valves that look like a black, and white disk with 2 small vacuum fittings? __________________ My list of useful threads. My photo gallery. My product reviews. My list of items for sale. Aerostar owners thread. Aerostar parts work in Explorers, Rangers, and Bronco II thread. History of the Aerostar thread. Aerostar Forum. New Members Forum.

05-23-2006, 09:17 PM	#5
BrooklynBay Aerostar Forum Moderator Brooklyn, NY 88 89 93 95 96 Aerostars Join Date: Nov 2005 Posts: 29,026 Vehicle Specs	Here is a picture of that check valve: __________________ My list of useful threads. My photo gallery. My product reviews. My list of items for sale. Aerostar owners thread. Aerostar parts work in Explorers, Rangers, and Bronco II thread. History of the Aerostar thread. Aerostar Forum. New Members Forum.