A/C compressor not turning on...
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Joined: May 2005
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A/C compressor not turning on...
Can't find a post to help me out here....My A/C just stopped working this week, working fine a couple of weeks ago. I have noticied that the A/C compressor doesn't turn on at all. I've checked the fuses inside the cab and they're not blown. I did see 2 or 3 relays under the hood for the A/c system...should I just try and replace those or is there anything I can do to figure out what is going on. Oh, and sure it craps out on most humid day of the year so fat... Thanks in advance for any help!!
-G
Oh yeah, 1999 F-150 5.4L 4x4 just turned 80K miles
-G
Oh yeah, 1999 F-150 5.4L 4x4 just turned 80K miles
Postmaster
Joined: Oct 2003
Posts: 4,516
Likes: 1
From: SoCal
Closest wiring diagrams that I have are for a 97 Explorer, The only relay thatcould cause this is the WOT/wide open throttle relay.
Your owneres manual might tell you the location & you can try swapping with another identical relay. Might get lucky.
Or if you're low on refrgerant the compressor wont come on.
Your owneres manual might tell you the location & you can try swapping with another identical relay. Might get lucky.
Or if you're low on refrgerant the compressor wont come on.
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
There are at least a dozen things that can cause your symptom.
Failure to follow a logical diagnostic procedure will likely waste your time and money and may lead to expensive damage.
First, check your charge level with a guage set. With a cold engine (say 80F), you should see at least 60 psi. As under hood temps increase, the static pressure can go up to 120 psi or so. If you have less than 45 psi static, the system is severely undercharged and cannot engage the cycling switch.
If the system charge is adequate, THEN you can procede to elecrical checks.
Steve
Failure to follow a logical diagnostic procedure will likely waste your time and money and may lead to expensive damage.
First, check your charge level with a guage set. With a cold engine (say 80F), you should see at least 60 psi. As under hood temps increase, the static pressure can go up to 120 psi or so. If you have less than 45 psi static, the system is severely undercharged and cannot engage the cycling switch.
If the system charge is adequate, THEN you can procede to elecrical checks.
Steve
Last edited by projectSHO89; Jun 5, 2006 at 09:10 AM.
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