AC cools, warms, then cools again
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Junior User
Joined: Aug 2004
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From: Delaware
AC cools, warms, then cools again
Hi,
I have a 97 f-150 4x4 4.9 litre eng. and when I turn on my AC it works fine for about 20 min. and then turns warm with a musty smell for about 5-10 min. and then it gets cold again. The freon levels seem to be OK but was wondering if it could be a cycle switch or something. Any info would be greatly appriciated.
Thanks, RShad
I have a 97 f-150 4x4 4.9 litre eng. and when I turn on my AC it works fine for about 20 min. and then turns warm with a musty smell for about 5-10 min. and then it gets cold again. The freon levels seem to be OK but was wondering if it could be a cycle switch or something. Any info would be greatly appriciated.
Thanks, RShad
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Junior User
Joined: Aug 2004
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From: Delaware
Thanks for your quick responce. Just a slip of the keypad on the 4.9 I have a 4.6L engine. Is there much involved with changing the cycling switch? I think that is what a friend of mine had wrong once but it cost him like $120.00 in labor.
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Junior User
Joined: Aug 2004
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From: Delaware
I picked up a cycling switch from ford but I am not sure it is the right one. Do I want the A/C clutch cycling switch or just the plain cycling switch. I don't have a picture that I can go by but I think one(clutch switch) has a round plug connector and one (cycling sw) has a oval connector.
Logistics Pro
Joined: Jul 2003
Posts: 3,595
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From: Lawton, Oklahoma
Your cycling switch should look like this...
Early Fords with R134 systems used one that looks like this...
http://www.clubfte.com/users/homerwi...clingearly.jpg
Early Fords with R134 systems used one that looks like this...
http://www.clubfte.com/users/homerwi...clingearly.jpg
Logistics Pro
Joined: Jul 2003
Posts: 3,595
Likes: 52
From: Lawton, Oklahoma
Your cycling switch should look like this...
Early Fords with R134 systems used one that looks like this...
Early Fords with R134 systems used one that looks like this...
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Junior User
Joined: Aug 2004
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From: Delaware
Thanks for you responce, the pictures helped alot. The switch that I have is a little smaller at the bottom where you use a wrench. I think this is the AC Clutch cycle switch (part # F5TZ-19D594-AA)that go's on the low presure line. I asked the parts guy for the AC Cycling swicth and this is what he gave me. Both switches are I guess cycling switches. I will have to get the other one tomorrow from Ford. Would you happen to know the Ford part number? I have a 4.6L eng. 4x4 F-150 Ext. Cab.
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Junior User
Joined: Aug 2004
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From: Delaware
I changed the cycling switch and still have the problem. It gets very cold but after about 20 minutes or so while driving it go's warm for about a minute and then it gets very cold again. Could it be the high pressure cut off switch. Or possably something else.
Thanks
Thanks
Logistics Pro
Joined: Jul 2003
Posts: 3,595
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From: Lawton, Oklahoma
Ive seen this happen when a blend door controller is malfunctioning, but really you cannot afford to just keep popping on this and that... you need an accurate diagnosis WHEN the problem is occuring...
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Junior User
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From: Delaware
Thanks for all your help it's very appriciated. I am going on a trip on friday and I know that I can't get my truck in the shop for at least two weeks so I thought I would give it a try. I guess I will just have to live with it until I get back. Thanks Again.
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