Pressurising KV6 190

MGStephen · 16th April 2014, 19:01

Hey guys.

Iv just done a deal on a ZT-T but its got some issues with the cooling system. The owner is saying its pressurising and leaking water from the cap. Its just had the belts, waterpump, tensioner etc done. Iv not gone the car yet but was wondering what the likely problem would be.

1: Cap itself
2: Head gaskets
3: Airlock, not being filled correctly.
4: Waterpump.

Any help in getting to the bottom of this is appreciated.

Jordan Apex · 16th April 2014, 19:05

I know there was a problem with the cap o rings on a petrol model not sure if it was 1.8 or kv6 may even be both, you can get replacements of viton variety for a couple of quid

nuts75 · 16th April 2014, 19:22

Mate i am havin same problem .took it in yesterday for a timing belt
change and water pump .and now got air lock .they tried to get it fixf today but couldnt
they going to do a flush and refill tomoz .just hope it gets done. Waz running spot on
before it went in .

No cooling issues at all . It sounds that yours ir a air lock to

MGStephen · 16th April 2014, 19:28

Quote:

Originally Posted by nuts75

Mate i am havin same problem .took it in yesterday for a timing belt
change and water pump .and now got air lock .they tried to get it fixf today but couldnt
they going to do a flush and refill tomoz .just hope it gets done. Waz running spot on
before it went in .

No cooling issues at all . It sounds that yours ir a air lock to

If thats all its going to be then il be over the moon!

MF1980 · 16th April 2014, 19:48

If it was fine before the new pump, and its now playing up it'll most probably be an air lock.
The V6 is a pain unless its bled properly.

Drain the system including block from bung in the front.
Undo bleed screw on hose under/alongside air filter.
Unbolt header tank and lift it as high as you can when filling.
Just for good measure, turn ign on and set heater to hot so the heater valves open
Fill until coolant flows from bleed screw, tighten up then run up to temp as per usual.

HTH.

willshot · 16th April 2014, 19:56

I had the same problem after a service at my local garage and my car overheated. I did the above procedure and all is well now.

SD1too · 16th April 2014, 20:10

Quote:

Originally Posted by MF1980

..turn ign on and set heater to hot so the heater valves open.

Mark; there aren't any heater valves.

Quote:

Originally Posted by MGStephen

Iv just done a deal on a ZT-T but its got some issues with the cooling system. The owner is saying its pressurising and leaking water from the cap.

Hi Stephen,

The first thing to check is the expansion tank level. The 'max' mark is quite low down inside the tank. It's possible that the system has been overfilled.
To check for overheating, start the engine from cold and press the windscreen demist button to check that the radiator fan is working properly. Activate the instrument pack diagnostics to monitor the actual coolant temperature. It should run in the low to mid nineties. The fan should trigger at 100°.

Quote:

1: Cap itself
2: Head gaskets
3: Airlock, not being filled correctly.
4: Waterpump.

Yes the cap could have a faulty valve or poor sealing rings. Head gasket failure is extremely unlikely on a V6. An airlock is a favourite as few garages know how to do this properly on the KV6. The waterpump may leak, but it won't cause overheating.

Simon

MGStephen · 16th April 2014, 20:29

Quote:

Originally Posted by SD1too

Mark; there aren't any heater valves.

Hi Stephen,

The first thing to check is the expansion tank level. The 'max' mark is quite low down inside the tank. It's possible that the system has been overfilled.
To check for overheating, start the engine from cold and press the windscreen demist button to check that the radiator fan is working properly. Activate the instrument pack diagnostics to monitor the actual coolant temperature. It should run in the low to mid nineties. The fan should trigger at 100°.

Yes the cap could have a faulty valve or poor sealing rings. Head gasket failure is extremely unlikely on a V6. An airlock is a favourite as few garages know how to do this properly on the KV6. The waterpump may leak, but it won't cause overheating.

Simon

Thanks Simon!

When i get the car on Friday il have a play about. How do i get into the diagnostics to monitor?

Stephen.

v-man · 16th April 2014, 21:18

Quote:

Originally Posted by MGStephen

Thanks Simon!

When i get the car on Friday il have a play about. How do i get into the diagnostics to monitor?

Stephen.

This should give you all the info you need Stephen.

Hope it helps.

MF1980 · 17th April 2014, 06:22

Quote:

Originally Posted by SD1too

Mark; there aren't any heater valves.

My bad, assumed there would be an electric water valve for the auto aircon setup

16th April 2014, 19:01	#1
MGStephen Posted a thing or two ZT 190 ZTT 180 Join Date: Mar 2008 Location: Lanarkshire Posts: 1,487 Thanks: 87 Thanked 146 Times in 101 Posts	Pressurising KV6 190 Hey guys. Iv just done a deal on a ZT-T but its got some issues with the cooling system. The owner is saying its pressurising and leaking water from the cap. Its just had the belts, waterpump, tensioner etc done. Iv not gone the car yet but was wondering what the likely problem would be. 1: Cap itself 2: Head gaskets 3: Airlock, not being filled correctly. 4: Waterpump. Any help in getting to the bottom of this is appreciated. __________________ LIFE'S TOO SHORT NOT TO Home to multiple MG and Rover cars. MG5 Exclusive Moonshine ZS 180 Twilight ZT 190 SE Atmosphere ZT-T CDTI Dark Fantasy 75 Contemporary SE CDTI Tourer Chatsworth 75 Contemporary SE V6 Tourer Passat 3.2 SEL Estate

16th April 2014, 19:05	#2
Jordan Apex This is my second home Jaguar XFR 2011MY Join Date: Oct 2013 Location: Harlow Posts: 6,363 Thanks: 19 Thanked 816 Times in 759 Posts	I know there was a problem with the cap o rings on a petrol model not sure if it was 1.8 or kv6 may even be both, you can get replacements of viton variety for a couple of quid __________________ Now sold! http://i750.photobucket.com/albums/x...psd81417f5.jpg

16th April 2014, 19:22	#3
nuts75 Gets stuck in Mgzt Join Date: Jan 2009 Location: uk west mids Posts: 671 Thanks: 118 Thanked 64 Times in 60 Posts	Mate i am havin same problem .took it in yesterday for a timing belt change and water pump .and now got air lock .they tried to get it fixf today but couldnt they going to do a flush and refill tomoz .just hope it gets done. Waz running spot on before it went in . No cooling issues at all . It sounds that yours ir a air lock to __________________ JUST NUTS ABOUT ROVER 75,,

16th April 2014, 19:48	#5
MF1980 Loves to post MG ZT190+ No.5863 Join Date: Dec 2013 Location: Swindon Posts: 321 Thanks: 52 Thanked 36 Times in 31 Posts	If it was fine before the new pump, and its now playing up it'll most probably be an air lock. The V6 is a pain unless its bled properly. Drain the system including block from bung in the front. Undo bleed screw on hose under/alongside air filter. Unbolt header tank and lift it as high as you can when filling. Just for good measure, turn ign on and set heater to hot so the heater valves open Fill until coolant flows from bleed screw, tighten up then run up to temp as per usual. HTH.

16th April 2014, 19:56	#6
willshot Posted a thing or two Ex-ZI190 owner. ,Ford Focus RS Join Date: Nov 2006 Location: Malton Posts: 1,573 Thanks: 1,123 Thanked 301 Times in 198 Posts	I had the same problem after a service at my local garage and my car overheated. I did the above procedure and all is well now.