180 V6 ZT Overheating

RoverRobson · 18th June 2017, 19:46

A friend of mine not on the forum has a 180 Auto ZT that is currently overheating.

Will run fine for a while and then needle will shoot up to red, come down, shoot up, hover a bit and go down.. up again and so on.

Coolant is bursting out of the cap.

It's recently had the thermostat done, coolant temp sensor and related pipework all spot on. New expansion tank cap also fitted.

Doubtful of an airlock.. anything else to look for? Quite worrying and renders his car unusable.

Cheers
Robson

trikey · 18th June 2017, 19:49

Oil cooler....

And good to meet you Today btw

RoverRobson · 18th June 2017, 19:57

Quote:

Originally Posted by trikey

Oil cooler....

And good to meet you Today btw

Nice to meet you too my friend.

I'll get that checked out. Wasn't aware oil cooler failure would cause this issue! Mad!

shasbat3 · 18th June 2017, 21:15

How about cooling fan. Have you checked it functions under test?

shasbat3 · 18th June 2017, 21:20

Start engine, press demist button, get out of the car and check that the fan is spinning. If not it'll either need a new gold resistor or, if a 3 speed fan is fitted, it'll maybe need the brushes replacing.

RoverRobson · 18th June 2017, 21:25

Quote:

Originally Posted by shasbat3

Start engine, press demist button, get out of the car and check that the fan is spinning. If not it'll either need a new gold resistor or, if a 3 speed fan is fitted, it'll maybe need the brushes replacing.

Forgot to mention all 3 speeds have been reported as functioning. Has resistor mod too.

Overheats at speed too.

Robson Rover Repair · 19th June 2017, 04:59

Quote:

Originally Posted by trikey

Oil cooler....

And good to meet you Today btw

As above!!!

RoverRobson · 19th June 2017, 05:36

No mayo in system as well like there usually is if the oil cooler is broken?

Sent from my iPhone using Tapatalk

SD1too · 19th June 2017, 10:25

Good morning Robson,

Quote:

Originally Posted by RoverRobson

Doubtful of an airlock..

Why is that? It's a real possibility if the cooling system wasn't filled and bled properly after the recent work. Here's the procedure. Your friend would be foolish not to.

Quote:

Originally Posted by RoverRobson

Forgot to mention all 3 speeds have been reported as functioning. Has resistor mod too.

This evidence tells me that someone doesn't know what they're talking about.

A 3 speed system should not have a resistor fitted. If there is a resistor present then it's a 2 speed system.

Ask your friend whether anyone (including the garage) has added K-seal at any time.

Simon

RoverRobson · 19th June 2017, 10:59

Quote:

Originally Posted by SD1too

Good morning Robson,

Why is that? It's a real possibility if the cooling system wasn't filled and bled properly after the recent work. Here's the procedure. Your friend would be foolish not to.

This evidence tells me that someone doesn't know what they're talking about.

A 3 speed system should not have a resistor fitted. If there is a resistor present then it's a 2 speed system.

Ask your friend whether anyone (including the garage) has added K-seal at any time.

Simon

Hi simon,

My apologies I thought V6's had 3 speed fan.

The thermostat was done by someone quite well known on these forums so I'm not going to name him, pretty sure he would have bled the system right as he's highly recommended on here.

And to our knowledge no K seal has ever been added to the system.

Cheers
Robson

18th June 2017, 19:46	#1
RoverRobson Gets stuck in MG ZT-T Join Date: Feb 2010 Location: County Durham Posts: 887 Thanks: 307 Thanked 262 Times in 150 Posts	180 V6 ZT Overheating A friend of mine not on the forum has a 180 Auto ZT that is currently overheating. Will run fine for a while and then needle will shoot up to red, come down, shoot up, hover a bit and go down.. up again and so on. Coolant is bursting out of the cap. It's recently had the thermostat done, coolant temp sensor and related pipework all spot on. New expansion tank cap also fitted. Doubtful of an airlock.. anything else to look for? Quite worrying and renders his car unusable. Cheers Robson __________________ Kind regards, Robson MG ZT-T SE Sports Auto 2.5 V6 180 Monogram Twilight - 1 of 1 Built "The Purple One"

18th June 2017, 19:49	#2
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,808 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	Oil cooler.... And good to meet you Today btw __________________ Lest we forget..

19th June 2017, 05:36	#8
RoverRobson Gets stuck in MG ZT-T Join Date: Feb 2010 Location: County Durham Posts: 887 Thanks: 307 Thanked 262 Times in 150 Posts	No mayo in system as well like there usually is if the oil cooler is broken? Sent from my iPhone using Tapatalk __________________ Kind regards, Robson MG ZT-T SE Sports Auto 2.5 V6 180 Monogram Twilight - 1 of 1 Built "The Purple One"

18th June 2017, 21:15	#4
shasbat3 Gets stuck in Jaguar S type. Join Date: Mar 2014 Location: Reading Posts: 706 Thanks: 730 Thanked 197 Times in 155 Posts	How about cooling fan. Have you checked it functions under test?

18th June 2017, 21:20	#5
shasbat3 Gets stuck in Jaguar S type. Join Date: Mar 2014 Location: Reading Posts: 706 Thanks: 730 Thanked 197 Times in 155 Posts	Start engine, press demist button, get out of the car and check that the fan is spinning. If not it'll either need a new gold resistor or, if a 3 speed fan is fitted, it'll maybe need the brushes replacing.