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Technical Bypassing the AC Compressor

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Technical Bypassing the AC Compressor

lukekazi

lukekazi

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Hello,

I have a 1999 MK2 Punto Sporting, im looking to bypass the AC Compressor.

Unlike the later MK2 the Alternator is mounted on the top beside the intake manifold & the AC is on the bottom. It runs two separate belts one from alternator to AC & the AC to Crank. (Similar to the Pic but the AC to Crank 'belt 2' is on the Inner Pulley on mine)
The Outer Crank pulley looks like it lines up with the Alternator but I have no idea what size belt it would take etc....

I'm wondering if anyone have any ideas or done anything similar to this?

FYI sorry about the unclear picture didnt have much time so just took a quick snap
 

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Think the bearings gone making a horrible rattling/chattering noise, ac stopped working years ago. Needed a condenser & a dryer so I never bothered to fix it.
 
I know it's an old thread but I've been looking at doing the same as the OP.
The compressor bearing on my 1.2 16V occasionally chirps or shrieks very loudly. Since the a/c doesn't work I intended to bypass the compressor using a longer drive belt from the outer crank pulley to the alternator pulley.
I measured the length for the new belt at 970mm and 4 Rib. Bought a Gates one and fitted it - all going too well. Unfortunately the outer crank pulley is 3 Rib and the alternator pulley is 4 Rib.
Anyone have any solution to this dilemma. I thought I might have the outer crank pulley or the alternator pulley ribs machined off as this might stop the belt wanting to ride up and off the crank pulley as it does at the moment due to the miss-match of pulley and belt.
Any thoughts would be very welcome.
 
Kirok said:
I know it's an old thread but I've been looking at doing the same as the OP.
The compressor bearing on my 1.2 16V occasionally chirps or shrieks very loudly. Since the a/c doesn't work I intended to bypass the compressor using a longer drive belt from the outer crank pulley to the alternator pulley.
I measured the length for the new belt at 970mm and 4 Rib. Bought a Gates one and fitted it - all going too well. Unfortunately the outer crank pulley is 3 Rib and the alternator pulley is 4 Rib.
Anyone have any solution to this dilemma. I thought I might have the outer crank pulley or the alternator pulley ribs machined off as this might stop the belt wanting to ride up and off the crank pulley as it does at the moment due to the miss-match of pulley and belt.
Any thoughts would be very welcome.
Click to expand...

So whats going on there? Have you got any ideas why the auxillary crank pulley has only 3 ribs?
 
Hi Judderbar, nope seems like an odd thing to design. The crank pulley is a two piece part with the ribbed drive sleeve pressed onto the crank pulley with a sandwich of rubber between the two parts. I don't think they can be separated and reversed, which would have solved the problem.
Another possibility I could investigate would be to see if I can find a 3 rib alternator pulley. I think that non a/c alternators have 3 rib belts and the a/c versions have 4 rib belts for some reason. If I can find a 3 rib pulley that fits that would solve the problem.
 
Thanks guys I hadn't even considered that as an option! The standard set up on the car is both belts are 4-rib so the alternator and a/c and crank have 4-rib pulleys.
So if I use a 3-rib belt off the outer crank 3-rib pulley it should mesh ok on the 4-rib alternator pulley?
 
The bearing noise you are hearing is probably the bearing in the compressor clutch. With a/c off it's running all the time. A small pullers gets the clutch off and the bearing is a simple press fit.
Just another option to let you keep the original belt set up.
 
Thanks for eveyone's help and advice and thanks g8rpi. I fitted a 975mm 3-rib and it works fine, the 3-rib outer crank pulley lines up very well with the 4-rib alternator pulley. The belt I used is a Gates Micro-V belt part number 3PK975
Belts within about 10mm of this would also work ok.
Next job is the rear brake shoes!
 
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