Aircon Compressor

[londoner]

Has anybody tried to get a aircon compresor? I need a cross-reference for it. The compressor seems to be drawing too much current and shorting the fuse. Aircon can't last more than 10 mins without blowing the fuse.

Thanks in advance.

[Enright]

But the compressor's mechanical.
The major function of the aircon switch is to engage the clutch so that the PAS belt drives it.
However at the same time the idle speed is increased by the ECU to compensate for the extra load, and the fans cycle too.
I think your problem is more likely to be a fan that is either burning out or has been fouled by the surround corroding.
Bearing that in mind, I'm going to move this from "Part Cross-Reference" to "Problems - Need Help!".

[Jackonicko]

They were on the aftersales list.

[Dave Eds]

They were on the aftersales list.

which is never far away

[Enright]

That's very helpful (in a slightly cryptic kinda way, mind you I'll remember your sig file from now on Dave! ) but my point is that throwing a new aircon pump at this is like changing your master cylinder when your brake lights keep blowing, or the ECU when you have a misfire. In other words it doesn't make sense, so I urge you to try to find the electrical problem rather than spending a lot of money on a component which probably wouldn't cure it.

[GeoffSmith]

... my point is that throwing a new aircon pump at this is like changing your master cylinder when your brake lights keep blowing, or the ECU when you have a misfire. In other words it doesn't make sense, so I urge you to try to find the electrical problem rather than spending a lot of money on a component which probably wouldn't cure it.

... and some nice analogies to boot!

[GeoffSmith]

Presumably it's the 7.5A fuse at position A2 - heating and aircon diagram. This only feeds the clutch winding (which I assume is within the compressor), so it would be worth checking the trinary switches and wiring for intermittent shorts first.

If you do need to replace the compressor, the part number is A100E6113F and they were on the January 2007 list for £199 incl. VAT but are now £213 + VAT.

[Sy V]

...I'm going to move this from "Part Cross-Reference" to "Problems - Need Help!".

I see your point Neil, but it might help londoner (whose a first-poster) if you'd left a shadow of the original so that he can find his thread again.

I'll sort something... done.

[londoner]

Thanks guy. The response is overwhelming.

I see your point Neil, but it might help londoner (whose a first-poster) if you'd left a shadow of the original so that he can find his thread again.

I'll sort something... done.

Thanks Sy ... No worries. I found my thread

But the compressor's mechanical.
I think your problem is more likely to be a fan that is either burning out or has been fouled by the surround corroding.
Bearing that in mind, I'm going to move this from "Part Cross-Reference" to "Problems - Need Help!".

That's very insightful. Thanks. I'll check out the fans.

Presumably it's the 7.5A fuse at position A2 - heating and aircon diagram. This only feeds the clutch winding (which I assume is within the compressor), so it would be worth checking the trinary switches and wiring for intermittent shorts first.

If you do need to replace the compressor, the part number is A100E6113F and they were on the January 2007 list for £199 incl. VAT but are now £213 + VAT.

Thanks Geoff. I'll let my mechanic check out the trinary switched (assuming he knows what that is). I think he has already checked the wiring. The a/c works for 10 mins until the fuse blows. He assumed that there's a short within the compressor that draws out too much current. So he's advising me to change the compressor.

They were on the aftersales list.

which is never far away

Thanks Dave and Jack.

Actually What I had intended to ask was if the compressor was a Isuzu compressor. If it was a Isuzu compressor, he'll be able to source one for me, instead of paying 200 pounds for the Lotus one.

If anybody knows, that'll be very helpful. Until then, I'll ask him to check the trinary and the wiring again.

Cheers guys.

[GeoffSmith]

Check out Rockauto for the 1990 Isuzu Impulse. Still ~$360 though!

[Perth_Elan]

Not to repeat what has already been said ! but the compressor is mechanical, and would not blow a fuse.

What is electrical is the electromagnetic clutch on the front that engages the compressor to the belt pulley when the a/c is requested.

Looking at the circuit the 7.5A fuse A2 only supplies the clutch so it can only be this that is blowing the fuse.

To be sure just disconnect the wires going to the electromagnet clutch A/C Compressor so when you switch the a/c on all other associated items operate but the clutch will not be energised and so if this is the culprit the fuse will not blow, it may be a short in the loom or at the trinary switches.

I expect as with all others that I have seen, the pulley and electromagnet coil can be removed from the compressor without actually removing the compressor from the car, you may need to releace the compressor from it's mounts to be able to slide the pulley and coil off but not actually disconnect the refrigerant lines, hence not have the task and expense of regassing etc.

Depending on your level of skill removal of the pulley and clutch could be sonething you can do. Once the coil is removed the pulley can be refitted and compressor mounted + belts etc so you can drive the car then visit scrapyard/parts dealer with the electromagnet coil and get a S/H or even a new one

P.S. if you are going to replace the compressor to solve this problem then sometimes they don't actually come with the electromagnet coil and pulley as each car is different so make sure it does have these parts as well as they are the correct items or it will be an expensive waste of time!

Peter

[davidh]

If you do decide to change the compressor I have a spare which i took of my SE last year when i was searching for an aircon leak and eventually found the problem elsewhere after replacing the compressor. Let me know if you need it as I am in Singapore.

David

[GeoffSmith]

Not sure if this is the right part but SGT lists

A100E6568F COMPRESSOR-AC (CFC FREE) Elan M100 1990 onwards £416.42 £104.10

[londoner]

Thanks guys. Will check out the options.