Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 15th May 2019, 07:43   #1
Muttley
Regular poster
 
MG ZT 190+

Join Date: Jan 2017
Location: DERBY
Posts: 95
Thanks: 56
Thanked 19 Times in 14 Posts
Default Air Con Concerns!

Its an early ZT190, its done 67k, its Solar Red, it has some lacquer peel, BUT I LOVE IT!

However, when the aircon is switched on I can hear whirring etc from the engine bay. As it stops when I press the ECON button I am assuming it is the aircon pump, and because I can hear it whirring the pump must be activating/spinning. It certainly doesn't chuck out the cold air I am used to.

So do I just get the aircon re-gassed and "re-oiled", or am I looking at a replacement aircon pump; and if so, has anybody used one of the NISSEN pumps advertised on Evil-Bay (they are about £100-£125 cheaper than the DENSO versions)?

Why are these things so expensive to resolve on cars worth the same price as the parts?

Cheers, Muttley
Muttley is offline   Reply With Quote
Old 15th May 2019, 08:41   #2
Mike Noc
This is my second home
 
Mike Noc's Avatar
 
Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4.

Join Date: Jul 2009
Location: Hampshire
Posts: 11,531
Thanks: 3,470
Thanked 3,119 Times in 2,247 Posts
Default

I had a similar rustling noise, and it turned out to be the cooling fan motor front bearing which had bought the farm.
Mike Noc is offline   Reply With Quote
Old 15th May 2019, 08:49   #3
SD1too
Doesn't do things by halves
 
SD1too's Avatar
 
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model.

Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,265
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
Default

Hi Paul,

Step 1:
Quote:
Originally Posted by Muttley View Post
It certainly doesn't chuck out the cold air I am used to.
Press the windscreen demist button to check that your radiator fan is working on slow speed.

Step 2:
Quote:
... I can hear whirring etc from the engine bay ... I am assuming it is the aircon pump ..
Try not to make assumptions. They usually turn out to be expensive mistakes (it could be an idler wheel or tensioner).
Quote:
... because I can hear it whirring the pump must be activating/spinning.
Verify that theory by observing the compressor clutch engaging whilst an assistant switches between 'Econ' and windscreen demist mode.

Step 3:
Quote:
So do I just get the aircon re-gassed and "re-oiled" ..
Find an independent air con. specialist (preferably mobile) who will extract your refrigerant and weigh it. You will then know whether the charge was correct or low. If it's correct, investigate the cause of the noise remembering that as the compressor puts extra load on the engine, other components may be responsible (on diesels it's the crankshaft pulley). If the charge is low, your specialist should check for leaks with low pressure nitrogen (holding a vacuum is not a reliable indication) and if o.k. evacuate for 30 minutes followed by a recharge.

Quote:
... has anybody used one of the NISSEN pumps advertised on Evil-Bay (they are about £100-£125 cheaper than the DENSO versions)?
I made the mistake of buying a Nissen condenser for my Citroën. The first one arrived damaged and the second sprung a leak from the receiver/drier just after the guarantee had expired. I found Nissen's customer service to be very arrogant so I would not recommend them.
Quote:
Why are these things so expensive to resolve on cars worth the same price as the parts?
Air conditioning is indeed expensive to maintain. It's one of those unfortunate things we encounter, rather like death and taxes.

Simon
__________________
"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
SD1too is offline   Reply With Quote
Old 15th May 2019, 20:58   #4
hogweed
I really should get out more.......
 
Vauxhall Insignia CDTi; MG TF 135

Join Date: Jan 2010
Location: Norn Iron
Posts: 2,942
Thanks: 942
Thanked 378 Times in 297 Posts
Default

Quote:
Originally Posted by SD1too View Post
It's one of those unfortunate things we encounter, rather like death and taxes.
And rear screen leaks. And thrust bearing failure. And… and…
__________________
Past cars: MGB GT; Escort 1300 Sport; Vauxhall VX4/90; Marina Coupe TC; Celica ST (1972); Montego Turbo; Astra GTE 16V; Astra GSI 16V; Golf GTI 16V (Mk II); Sierra XR4x4 Estate; BMW 325i (E30); BMW M3 3.0; BMW M3 3.2 Evo. Left some of the more embarrassing ones out. And about 30 motorbikes.
hogweed is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 18:43.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd