Search found 12 matches

by hcanning
Mon Jun 25, 2018 7:30 am
Forum: Automotive Air Conditioning Forum
Topic: Turning off a/c compressor before staring engine
Replies: 2
Views: 408

Re: Turning off a/c compressor before staring engine

Cusser wrote:On most vehicles, the AC compressor and other accessories are not on the Start circuit, are on the Run circuit only. So it shouldn't matter, but OK to do so if you desire.


I'd have thought the same - my car's compressor clutch kicks in about 3-5 seconds after the engine has started.
by hcanning
Sun Jun 17, 2018 7:01 am
Forum: Automotive Air Conditioning Forum
Topic: Noise from new compressor
Replies: 1
Views: 425

Noise from new compressor

Hi all, I had a new compressor fitted yesterday, as well as a new condenser (and receiver/dryer), and a thorough flush of the system. Acccording to the AC technician everything appears to be working perfectly, and it certainly seems so - good vent temps (around 6c) and good pressures - 30psi low and...
by hcanning
Thu May 31, 2018 10:42 am
Forum: Automotive Air Conditioning Forum
Topic: Replaced compressor, failed again 9 days later. Advice sought
Replies: 19
Views: 2039

Re: Replaced compressor, failed again 9 days later. Advice sought

The AC guy has just come to have a look at it and he seems to think that some free play in the alternator overrunning pulley is causing problems. He checked the pressures (engine off) and said they seem to indicate the right amount of gas, but obviously we’ll know for sure when he removes the gas to...
by hcanning
Mon May 21, 2018 9:21 am
Forum: Automotive Air Conditioning Forum
Topic: Replaced compressor, failed again 9 days later. Advice sought
Replies: 19
Views: 2039

Re: Replaced compressor, failed again 9 days later. Advice sought

Most modern alternators have a freewheeling pulley that disengages in one direction (reverse) so that the inertia of the alternator doesn’t damage other components when the engine speed rapidly decreases. A bit like freewheeling on a bicycle.
by hcanning
Mon May 21, 2018 12:29 am
Forum: Automotive Air Conditioning Forum
Topic: Replaced compressor, failed again 9 days later. Advice sought
Replies: 19
Views: 2039

Re: Replaced compressor, failed again 9 days later. Advice sought

Thank you, I will update again once it's been inspected by someone who knows what they're doing :) Another theory I was told was that potentially the freewheel clutch pulley on the alternator is failing (not slipping properly in one direction) and putting undue stress on the compressor pulley. Or so...
by hcanning
Sat May 19, 2018 10:19 am
Forum: Automotive Air Conditioning Forum
Topic: Replaced compressor, failed again 9 days later. Advice sought
Replies: 19
Views: 2039

Re: Replaced compressor, failed again 9 days later. Advice sought

Thanks for your analysis! This is probably the avenue I’ll take.

Those pressures were measured at idle speed though, not at 1500rpm. Can’t imagine it’ll make much difference though.
by hcanning
Thu May 17, 2018 11:38 am
Forum: Automotive Air Conditioning Forum
Topic: Replaced compressor, failed again 9 days later. Advice sought
Replies: 19
Views: 2039

Re: Replaced compressor, failed again 9 days later. Advice sought

Just realised the pressure readings are written on the piece of paper I have!

Ambient temp: 21c
Vent temp: 5c
Low pressure S/R: 2.0
High pressure S/R: 7.5

Presumably these readings are in Bar!
by hcanning
Wed May 16, 2018 10:08 am
Forum: Automotive Air Conditioning Forum
Topic: Replaced compressor, failed again 9 days later. Advice sought
Replies: 19
Views: 2039

Re: Replaced compressor, failed again 9 days later. Advice sought

Thanks!

So I’ve had a bit of a look around with a UV light, and the only evidence of any leakage I can see is on the LP valve, here’s a photo:

https://m.imgur.com/a/M0BVJyK

Although this is probably just where it was filled?

The HP valve had no trace at all.
by hcanning
Wed May 16, 2018 6:08 am
Forum: Automotive Air Conditioning Forum
Topic: Replaced compressor, failed again 9 days later. Advice sought
Replies: 19
Views: 2039

Re: Replaced compressor, failed again 9 days later. Advice sought

Thank you!

So, am I right in assuming that the compressor, erm, compresses in the direction that the condenser is "first", so any debris pumped through the system by the compressor will only reach the condenser, and not flow to any other more remote parts of the system?

Thanks again.
by hcanning
Tue May 15, 2018 2:11 pm
Forum: Automotive Air Conditioning Forum
Topic: Replaced compressor, failed again 9 days later. Advice sought
Replies: 19
Views: 2039

Re: Replaced compressor, failed again 9 days later. Advice sought

Thanks again for your replies! The compressor wasn’t OEM - well, it probably was once upon a time but I’m afraid I have to admit I went for the cheapest option of a refurbed unit! I am thinking that I’ll spend a bit more on a new aftermarket one this time around - are even the cheaper ones usually a...

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