AC Stopped working
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
AC Stopped working
My AC needed a recharge, it had nearly nothing when I checked the pressure. So I charged it, and it started working. This was 2-3 weeks ago. The other day I turned on the ac, and i'm not hearing hte compressor kick on, it's not getting cold as well. So I hooked up my gauge to see if it was low again. However, this time it pegs to max. I tried a different gauge and the same results. I definitely didn't overcharge it, so I'm curious why this is happening. Even if it's overcharged wouldn't hte compressor still kick on?
I'm not the most well versed in AC systems, but I know the basics. However, I'm not sure where to even start.
Edit: I have a 800 mile family road trip tomorrow in 90F heat, so I kind of need to get this fixed asap.
I'm not the most well versed in AC systems, but I know the basics. However, I'm not sure where to even start.
Edit: I have a 800 mile family road trip tomorrow in 90F heat, so I kind of need to get this fixed asap.
Thread Starter
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
The clutch is engaging. but the condenser or whatever that thing is on the top is not getting cold. i dropped it off at pepboys and am having them do a full evac and recharge in the interest of time.
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
I thought so, considering i called htem at lunch and dropped it off and they made room. It won't be done until tomorrow though. Which is funny because i got a call a half hour before that saying my reservation got messed up at myrtle beach, and they'd have to rebook me from sunday-sunday instead of saturday-saturday. so that seems like it lined up perfectly.
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
They replaced the compressor and recharged and it’s not engaging. They’re scratching their heads. Clutch is getting voltage but it’s inconsistent. What should it be readying?
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Hotshot
Joined: Dec 2014
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From: Jersey Shore
AC clutch relay. Not sure how your particular truck is laid out, but you might find it in the Auxillary box by the master cylinder.
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
Ralay replaced and still not working. However I jumped the 3 and 5 pin ad the relay with a wire and it came on. Is there any risk to just run with a wire temporarily for my trip? Would that be any different from leaving the ac on all the time?
Hotshot
Joined: Dec 2014
Posts: 17,823
Likes: 3,103
From: Jersey Shore
I'm not sure what you have in your vehicle, but here is the PITA service manual troubleshooting section. I't a PITA because it's not separate from manual to electronic, so you have to read through each step.
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
Thanks I’ll give that a read.
- So so it turns out that pin 3 has power all the time even with engine off.
- Pin 1 has power all the time only when engine is on.
- Pin 2 is ground and operates with pin 1 to activate the relay, but is only connected to ground when you turn the ac on. Very annoying style.
- Pin 5 gets power from pin 3 when the relay is activated.
- my problem is pin 2 never gets grounded when the ac system is put on.
Im searching for amp ratings but nothing yet. If anyone has input it would really be appreciated.
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Fleet Mechanic
Joined: Feb 2008
Posts: 1,955
Likes: 6
From: Eastern PA
Ok so the fuse under hte dash, #10, controls hte power to pin 3. I tried jumping pin 1 to pin 5 and it worked, but i don't trust it. Pin 3 is a 10a fuse, so it's not that heavy to engage the clutch. I created a permenant jumper from pin3 to pin5, then pulled the fuse. So now pulilng the fuse is my AC on/off switch. I'll fix it properly, but 800 mile road trip tomorrow, definitely didn't want to take the wifes fusion with my wife and 2 teen age girls.
