AC high pressure switch?
Thread Starter
|
Senior User
Joined: Oct 2004
Posts: 235
Likes: 1
AC high pressure switch?
Where is this located? Is it the electrical plug that plugs into the back oh the compressor manifold line? I am building pressure on the high side and losing freon through the relief valve. Is it because of the switch? When I'm low on freon my compressor kicks on and off. But when it's full I never here it kicking off. Is that normal?
Fleet Owner
Joined: Aug 2004
Posts: 20,419
Likes: 197
From: AZ
The high pressure switch is on the top back of the compressor. A two wire plug. I would not think your problem is because of the high pressure switch. Although, I have to admit I don't know about the relief valve. Others will be along.
Elder User
Joined: Dec 2008
Posts: 737
Likes: 0
From: Page Az.
Glenn has it right on the switch. Have you any ideal what your pressures are, should be 28-30 psi on the low side and (IIRC)250 psi on the high side. I know that the relief valves can blow if not enough air flow over the condenser. Also possible the relief valve is just weak. Also it is normal for your compressor to not cycle continuously if the system is properly charged.
Thread Starter
|
Senior User
Joined: Oct 2004
Posts: 235
Likes: 1
Not sure on the high side pressure. Clutch fan is good so there should be enough air moving over it. Low side never gets above 45 psi. It's 95-100 degrees here so that should be normal right? How could you measure the high side? Is there a gauge similar to the low side ones? Had a leak down test done on the machines and in 4 hours the needle never even budged.
Thread Starter
|
Senior User
Joined: Oct 2004
Posts: 235
Likes: 1
Trending Topics
Thread Starter
|
Senior User
Joined: Oct 2004
Posts: 235
Likes: 1
Also what would some reasons be for building pressure? And could it be leaking behind the condenser? I hear a hissing sound when I turn my truck off. Lasts about 10-15 sec. Is that normal? I never paid attention before until my problems started.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Post Fiend
Joined: Dec 2009
Posts: 15,505
Likes: 18
From: Livoina,La
Thread
Thread Starter
Forum
Replies
Last Post
colonelsanders2k7
Explorer, Sport Trac, Mountaineer & Aviator
1
May 30, 2011 04:12 PM
treetop
Cooling, Heating, Ventilation & A/C
8
Nov 17, 2005 09:25 PM
