Aircon help!

ViT · 15th April 2014, 20:32

My ZT has been off the road for 6 months and is now back on. I needed to use the ACC system earlier this week but I was surprised to find that cool air wasn't blowing out.

I need some help diagnosing it.

I have changed my spark plugs recently, and needed to disconnect what I believe is the trinary valve plug from the AC pipe, so I could gain access to the bulk head plates to remove them. Hasn't worked since then for definitely.

Things I've checked:

Pressing "Auto" causes the raditior fan to come on
Pressing "Off" kills the fan
I can't hear the compressor engage

all help is appreciated, I could be very low on refrigerant but want to rule out everything else.

trikey · 15th April 2014, 20:41

If your gas is low, the pressure switch won't allow the AC to work!

350zwelgje · 15th April 2014, 21:02

There is a wire connected to the compressor to engage the clutch when ac is switch on/needed, if not connected no aircon. Perhaps worth a look/check.

Rob

ViT · 15th April 2014, 21:07

Quote:

Originally Posted by 350zwelgje

There is a wire connected to the compressor to engage the clutch when ac is switch on/needed, if not connected no aircon. Perhaps worth a look/check.

Rob

Where should I be looking?

Billy1mate · 15th April 2014, 21:33

The AC will run until it gets too hot then the trinary switch will switch the AC off, do you know what condition your condenser is in?

350zwelgje · 16th April 2014, 20:14

Quote:

Originally Posted by ViT

Where should I be looking?

There is a red wire at the compressor, check if it it connected: not easy....

Rob

350zwelgje · 22nd April 2014, 20:34

Quote:

Originally Posted by 350zwelgje

There is a red wire at the compressor, check if it it connected: not easy....

Rob

Problem sorted? If not:
While under a 75 last weekend, the wire can be seen looking at the bottom of the compressor, towards the front of the car. Then it goes up and disappears in what looks like a connector...

Rob

15th April 2014, 20:32	#1
ViT Avid contributor Trophy Blue MG ZT 190+, Union Blue MG6 Magnette TSE and Orange Marmalade MG3 3Style Join Date: Dec 2009 Location: Tenbury Wells Posts: 191 Thanks: 17 Thanked 3 Times in 3 Posts	Aircon help! My ZT has been off the road for 6 months and is now back on. I needed to use the ACC system earlier this week but I was surprised to find that cool air wasn't blowing out. I need some help diagnosing it. I have changed my spark plugs recently, and needed to disconnect what I believe is the trinary valve plug from the AC pipe, so I could gain access to the bulk head plates to remove them. Hasn't worked since then for definitely. Things I've checked: Pressing "Auto" causes the raditior fan to come on Pressing "Off" kills the fan I can't hear the compressor engage all help is appreciated, I could be very low on refrigerant but want to rule out everything else. __________________ http://badges.fuelly.com/images/sig-uk/202608.png

15th April 2014, 20:41	#2
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,790 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	If your gas is low, the pressure switch won't allow the AC to work! __________________ Lest we forget..

15th April 2014, 21:02	#3
350zwelgje Avid contributor 75 KV6 2.5 3x Rover 75 CDT Join Date: Jan 2011 Location: Belgium Posts: 249 Thanks: 6 Thanked 34 Times in 33 Posts	There is a wire connected to the compressor to engage the clutch when ac is switch on/needed, if not connected no aircon. Perhaps worth a look/check. Rob __________________ 75 KV6 2.5 Sterling automatic, 3x 75 CDT (2 manual + automatic), MG ZT 190+, 620i, SD1 2300S, P6 2000SC & TVR 350i

15th April 2014, 21:33	#5
Billy1mate Posted a thing or two 120d M Sport Join Date: Feb 2012 Location: Sunny Weymouth Posts: 1,815 Thanks: 153 Thanked 142 Times in 121 Posts	The AC will run until it gets too hot then the trinary switch will switch the AC off, do you know what condition your condenser is in?