Another a/c question
Thread Starter
|
Senior User
Joined: Feb 2007
Posts: 137
Likes: 0
Another a/c question
I have a 98 4.6, automatic, 4x4, extended cab with 60,000 miles. The a/c is not blowing cold air. I noticed that the a/c clutch cycles on and off. Is this normal, and if so how long should it stay on and off when the a/c is on?
Thanks
Thanks
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
if it cycles then you are o.k. electrical--------- with the proper amount of R134 inside, it will not cycle, or will be quite a while between cycling. if you have a gauge set, you should have about 35 psi on the low side and 300 psi on the high side (estimates). you will cycle if the freon runs really low ( like 15 psi) or if it is way overfull and the pressure goes up to 400 psi.
Thread Starter
|
Senior User
Joined: Feb 2007
Posts: 137
Likes: 0
On the low side i have 35 when the compressor is not on and 55 when it is on. do I need to let some out and if so how?
Trending Topics
Thread Starter
|
Senior User
Joined: Feb 2007
Posts: 137
Likes: 0
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
motor off, you should have 100 psi. motor running , AC on, it will pull down to 35 psi as it pushes the freon to the opposite side. if it pulls much lower it will kick out. if you have 35 psi and it is kicking out, you may want to check the high side pressure, maybe it is kicking out on "high". there is an orifice tube between the high and low side. if the low is o.k., and the high is too high, then you dont have too much freon, you have a partly plugged orifice tube.
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
If you're reading 35/55 psi at the cycling limits, you probably need a new gauge (perhaps a cycling switch).
Correct cycling values are 22.5/45 psi.
It is very unlikely that you are kicking out due to the HIGH side pressure switch. You'd have to have the low side almost into vacuum for that to happen unless you were over charged, an improbably event except where a DIYer has been screwing with the charge level.
In any event, you are likely undercharged due to a leak in the pressurized system.
Steve
Correct cycling values are 22.5/45 psi.
It is very unlikely that you are kicking out due to the HIGH side pressure switch. You'd have to have the low side almost into vacuum for that to happen unless you were over charged, an improbably event except where a DIYer has been screwing with the charge level.
In any event, you are likely undercharged due to a leak in the pressurized system.
Steve
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
you really need to check the HP side to get a final answer to your problem. if the orifice is partly plugged then you will get way too much psi on the high side since it cant exapnd thru the hole and get back to the LP side. this is not an easy job, the freon would ned to be extracted, hose disassembled and tube removed, new installed, pull valcuum, then add the refrigerant back to ploler level.-----project is right, the dont happen by itself. since you have a 98, i can assume the guy befor you might have added a can of gas once or twice. he couldl add to much, or got contaominants during the fill that plugged the orifice.---------- only knowing the pressure will tell you.