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Bypass AC compressor...here are the part #'s

 
Old 12-22-2010, 03:44 PM
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Default Bypass AC compressor...here are the part #'s

I started a thread the other day asking if anyone knew the belt # needed to bypass a seized AC compressor but didn't have any luck. This morning I did the fix to my 99 4.6 4x4 scab and it was too easy. The belt needed to be shorter and I swapped the idler pulley for one the same size but ribbed since the belt now runs over it instead of under it. The end result works so well that I can't figure why Ford went to the trouble of designing the AC/non-AC setups so differently. Here are the Gates part #'s needed to do the job.

Belt...#K080806 8 rib/81 1/8" long

Idler Pulley...#38052 8 rib/90mm dia.

The parts can be looked up here...
http://www.gates.com/index.cfm?location_id=3359
for all the details.

I hope this helps anyone else who encounters this all too common problem in the future. The fix is inexpensive and only takes a minute or two to swap the pulley then just change the belt bypassing the compressor and putting it over the idler instead of under it. Back on the road again

J.R.


Last edited by JohnnyR; 12-22-2010 at 03:53 PM.
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Old 07-06-2011, 11:19 PM
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Thumbs up Works Great!

Thanks a bunch for the info and part numbers. My compressor just froze up yesterday and I can't do the repairs right away, so I bought the belt and ribbed idler pulley. It took me a little longer than 5 minutes, but it was a lot easier than removing the compressor and installing a bypass pulley.

EZ
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Old 07-12-2011, 10:54 AM
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Wow, I posted the fix just before Christmas last year and got no replies but I'm glad the info was able to help you out EZ. Give the hardest job to the laziest guy and he'll figure out the easiest way to do it!

J.R.
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Old 08-06-2011, 09:42 PM
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Hey, I just wanted to say thank you. My AC compressor was going. I don't ever use AC, so this guide was what I was looking for in order to bypass my AC. You are great help!!!! Thank you once again. Now my truck runs nice and quiet again =) Oh and just to add to this guide, I used a 79.79" belt. So I guess anything between my size and yours will work. But you're the man!
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Old 12-22-2011, 04:48 PM
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Default For a '97, try...

Thanks JR. You provided a great starting point for this project. I have a '97 F150 with the 4.6L motor and had to use a smaller pulley. The Gates' part number is 38053.

I took some time to remove the air filter housing, cooling fan and the fan shroud and disconnected the cooling line to the top of the radiator. Once all that was done, it took maybe 90 seconds to replace the pulley and belt. Runs just fine now.
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Old 08-17-2015, 11:53 AM
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Originally Posted by JohnnyR View Post
I started a thread the other day asking if anyone knew the belt # needed to bypass a seized AC compressor but didn't have any luck. This morning I did the fix to my 99 4.6 4x4 scab and it was too easy. The belt needed to be shorter and I swapped the idler pulley for one the same size but ribbed since the belt now runs over it instead of under it. The end result works so well that I can't figure why Ford went to the trouble of designing the AC/non-AC setups so differently. Here are the Gates part #'s needed to do the job.

Belt...#K080806 8 rib/81 1/8" long

Idler Pulley...#38052 8 rib/90mm dia.

The parts can be looked up here...
http://www.gates.com/index.cfm?location_id=3359
for all the details.

I hope this helps anyone else who encounters this all too common problem in the future. The fix is inexpensive and only takes a minute or two to swap the pulley then just change the belt bypassing the compressor and putting it over the idler instead of under it. Back on the road again

J.R.

What does this do with the routing of the belt around the tensioner? I have a 5.4 (appears that the same routing applies for the 4.6) which has a smooth tensioner with the belt wrapped around it. With your method, the only way I see the belt contacting the tensioner is on the right third? Of the pulley maybe. Is that the way you had it routed?
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Old 08-24-2015, 08:01 AM
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Thanks for posting this.
My AC in my 2003 4.6 4x4 just went recently.
Was trying to find out a way to get it going again without spending allot and this will be perfect since don't use AC much anyway.

Will let you know how it goes.

Does Ford dealer normally carry these parts #'s or go somewhere like Napa?
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Old 08-24-2015, 10:13 AM
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Called the local Canadian Tire and they said for my truck it's different parts.
Do you guys know if it's the same from you 1999 4.6 4x4 as my 2003 4.6 4x4?
They said my belts are 6 rib.

Can I do the mod you did on my truck?
Sorry, I'm new to the F150 bought my brother's used F150 and they serpentine belt let go because the AC compressor seized (thing won't budge if I try to turn by hand).
I don't want to replace or remove the AC compressor I just want to put a new serpentine and bypass the compressor entirely like you did.


Don't know what parts I'll need for my particular truck though.
Any help would be really appreciated.
Thank you.
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Old 08-24-2015, 02:14 PM
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Okay have been searching around the web and found this part number for the "non-AC belt".

790K6

The belt is 6 rib and 79.5 inches long.
Paired with the non-AC idler pulley (ribbed not smooth) should be able to bypass the AC. Gonna look for the non-AC idler pulley part # and will post up what I find.

Just out of curiosity JohnnyR, how come you were using 8 rib belt/pulley for yours?
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Old 08-24-2015, 02:38 PM
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For the "grooved" 6 rib idler pulley, RockAuto is showing part # 89130

http://www.rockauto.com/catalog/more...nid=497&jpid=7


Drive Belt Idler Pulley; 90mm x 17mm 6 Groove w/Flange
Trying to find out from Ford but so far first couple dealers I called don't know they just say to get the Dorman AC compressor replacement/bypass pulley and use original belt.
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