AC issue...help please!
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Senior User
Joined: Dec 2011
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AC issue...help please!
Hey all, I'm new to diagnosing AC issues in automotive applications but understand how it works and am mechanically capable. Anyway, when i turn the AC on, to max or normal the fan blows with no cold at all. I did notice a clicking relay sound under the truck only when the AC was turned on, it happens every 2-3 seconds. Does my system need recharged, or is it a bad relay? Also, is there a guide on recharging my sig rig? Thank you!
Post Fiend
Joined: Feb 2009
Posts: 8,773
Likes: 1
From: Texas Coast
Okay you could have low pressure, you could ahve high pressure. Of which either will open the clutch on the compressor.
You could have a simple issue with the pressure switch connection-wire contacts. Not likely.
You could have the wiring connection to the compressor clutch having bad contacts- Check that out first- pull it look at it and see if you see anything. Hook is back up and see what happens.
The PCM could be opening the ckt to the cutch if the AC module is bad or is not picking up the evap coil temp.
Not eyeing your vehicle out I will blindly make this comment. If the AC unit is engaged and you have an electric fan at the front radiator area or even if its dual fans. That fan should instantly come on if the AC unit is turned on. Check that. If its not then the ckt is open on fan or the ac
Also your suction line pressure should run in the neighborhood of 45 # normally I compensate for temps and all but 45 # give ot take 3 should put you in the right area.
Check those things out and maybe you can find the issue.
You could have a simple issue with the pressure switch connection-wire contacts. Not likely.
You could have the wiring connection to the compressor clutch having bad contacts- Check that out first- pull it look at it and see if you see anything. Hook is back up and see what happens.
The PCM could be opening the ckt to the cutch if the AC module is bad or is not picking up the evap coil temp.
Not eyeing your vehicle out I will blindly make this comment. If the AC unit is engaged and you have an electric fan at the front radiator area or even if its dual fans. That fan should instantly come on if the AC unit is turned on. Check that. If its not then the ckt is open on fan or the ac
Also your suction line pressure should run in the neighborhood of 45 # normally I compensate for temps and all but 45 # give ot take 3 should put you in the right area.
Check those things out and maybe you can find the issue.
Post Fiend
Joined: Feb 2009
Posts: 8,773
Likes: 1
From: Texas Coast
I was not familar with your reference until I went searching
Maybe he was not either
If he was not and returns he can click here for that reference
https://www.ford-trucks.com/forums/7...xpedition.html
maybe that would help.
Fleet Owner
Joined: Mar 2012
Posts: 26,188
Likes: 4,151
From: Near Cal. Avenue
This perty much sums up AC failures. Hope it helps some!
How to remove entire plenum and evaporator core - Pics! - F150online Forums
How to remove entire plenum and evaporator core - Pics! - F150online Forums
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