Need help with a/c
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Freshman User
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Need help with a/c
I have a EB 03 Expedition. Front a/c works great, blows about 40 degs. Rear only blows around 75deg. Both blend doors are working. I put the gauges on it and its reading about 30 on the low and 170 on the high side. It also sounds like the compressor is clicking alot. Are these numbers normal? Also how could front blow so good and the rear be warm?
Fleet Owner
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How do you know this? Just because the arm moves all the way over doesn't mean the door is sealing or isn't damaged inside the assembly.
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Freshman User
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I pulled the motor off the ceiling/ floor blend door and pushed it open to watch the other one. I had my wife turn the temp **** from hot to cold. It opened and closed fine. I then observed the floor/ceiling door and it too worked fine. I also noticed the evap coil is getting cool.
Fleet Owner
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Then the only possibility left is a restriction within a hose or the evaporator core for the rear unit. I believe the hoses going to and from the evaporator core run under the truck. That being said, it's possible that one of them got damaged/crushed if you either went off-road, or hit something that bounced up from the road.
Posting Guru
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If you've checked everything else, it must be the expansion valve in the evap.
You can make a quick check by feeling the pipes that bring refrigerant to the rear unit. With the truck idling and the A/C on max, one will be hot and the other will be cold if your rear A/C is operating correctly. If both are hot, then the expansion valve is wide open.
You can make a quick check by feeling the pipes that bring refrigerant to the rear unit. With the truck idling and the A/C on max, one will be hot and the other will be cold if your rear A/C is operating correctly. If both are hot, then the expansion valve is wide open.
Senior User
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If the rear evap is only getting cool then it won't make very cold air. It should get pretty dang cold.
99ExpyProblems,
You mention the expansion valve. I assume the front/rear each have their own. If he is getting good pressures (thinking mostly about the high side) I would think the expansion valve wouldn't be stuck open, but maybe mostly blocked with debris.
99ExpyProblems,
You mention the expansion valve. I assume the front/rear each have their own. If he is getting good pressures (thinking mostly about the high side) I would think the expansion valve wouldn't be stuck open, but maybe mostly blocked with debris.
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Posting Guru
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If the rear evap is only getting cool then it won't make very cold air. It should get pretty dang cold.
99ExpyProblems,
You mention the expansion valve. I assume the front/rear each have their own. If he is getting good pressures (thinking mostly about the high side) I would think the expansion valve wouldn't be stuck open, but maybe mostly blocked with debris.
99ExpyProblems,
You mention the expansion valve. I assume the front/rear each have their own. If he is getting good pressures (thinking mostly about the high side) I would think the expansion valve wouldn't be stuck open, but maybe mostly blocked with debris.
If the expansion valve is working correctly, the evaporator in the rear will get cold. If the expansion valve is stuck shut, the evap will not be cold. From what I understand, this is a pretty common problem with Rear A/C on Ford vehicles. Well, that, and the blend doors!
Unfortunately, this is only an educated guess, and results in replacing the expansion valve, but more importantly, reclaiming all refrigerant and pulling a vacuum on the system and replace filter drier. It's not cheap, but just wanted to let you know...
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