AC Questions
Thread Starter
|
Cross-Country
Joined: May 2020
Posts: 83
Likes: 4
AC Questions
Howdy folks, I’m back again. I have a 94 F150 Flare side with the 5.0 motor, and I’m trying to get the AC working in this thing. When I bought the truck, it had been wrecked on the passenger side so first thing I did was replace the blower motor/evap core housing. I then tried to charge it, and discovered it had a pretty good leak in the drier/accumulator. I replaced the accumulator, and tried charging it again, and I noticed the compressor clutch wasn’t kicking on, so I jumped the clutch cycling switch to see if it would come on, which it did, and went ahead and charged it up to about 32 PSI. When I plugged the switch back in, the clutch went back to not engaging, so I checked to see if it needed Freon again, which it read it had 95 PSI now. So I went ahead and changed the clutch cycling switch and it still won’t kick the compressor on. I’ve also checked the fuse and it’s good. What else could be causing the compressor to not kick on? Thanks.
Thread Starter
|
Cross-Country
Joined: May 2020
Posts: 83
Likes: 4
Okay so now I’ve added some, I’ve got about 43-45 pounds in it, and with the clutch cycling switch plugged in it comes on for about a second, and then shuts off for like 10 seconds. When the clutch comes on it says it has about 20 PSI in it, and the air isn’t very cold. Should I keep adding?
With the engine off it shows the system has 60 PSI
With the engine off it shows the system has 60 PSI
Fleet Mechanic
Joined: Dec 2006
Posts: 1,925
Likes: 10
From: Phoenix, AZ
I believe these systems take about 38oz of R-134a when empty. However, like MyFordtrucks was asking, vacuuming down the system is very important before adding anything. You want the system fully vacuumed down before you add any refrigerant.
If you did vacuum the system down, then you are relatively safe purchasing four of the 12oz cans and just filling through the low pressure side near the accumulator while using about 1/2 of the 4th can (because there is going to be some loss between switching cans.) If you didn't vacuum it down, I'd highly recommend having it vacuumed down and leak tested before trying some more.
Amazon sells some manifold gauge sets that are relatively cheap, and harbor freight sells a vacuum pump for 10 dollars that works with an air compressor. So if you have an air compressor handy, you don't have to spend too much money to be able to pull a vacuum on the system. If you weren't able to vacuum the system down and had it open, there is a good chance you system won't last too long and won't operate correctly.
If you did vacuum the system down, then you are relatively safe purchasing four of the 12oz cans and just filling through the low pressure side near the accumulator while using about 1/2 of the 4th can (because there is going to be some loss between switching cans.) If you didn't vacuum it down, I'd highly recommend having it vacuumed down and leak tested before trying some more.
Amazon sells some manifold gauge sets that are relatively cheap, and harbor freight sells a vacuum pump for 10 dollars that works with an air compressor. So if you have an air compressor handy, you don't have to spend too much money to be able to pull a vacuum on the system. If you weren't able to vacuum the system down and had it open, there is a good chance you system won't last too long and won't operate correctly.
Thread
Thread Starter
Forum
Replies
Last Post
pecanflyboy
Cooling, Heating, Ventilation & A/C
6
Nov 5, 2012 12:33 PM
michaelbrainardatwor
Cooling, Heating, Ventilation & A/C
4
Dec 9, 2007 08:01 AM
JefFZ6
Cooling, Heating, Ventilation & A/C
11
Jul 2, 2007 09:21 PM
