Cold heaters... please help :(

Nickc10 · 25th January 2012, 16:40

Ok so ive been looking through the forums for a while and this is my 1st post

recently bought a 2005 ZT 190 with 64k and full service history

only problem is.... the heaters are cold :S

got told this could be a problem with the heater matrix so i took it out, cleaned it thoroughly until it was getting hot all over and put it back in

still cold.....

thought it may be an airlock so continued to bleed system through and still nothing.... until....whilst engine was running i undid the cap to see how much pressure was in the system and low and behold... HEAT!

But when u tighten the cap back on it goes cool again, i am completely stumped...

also just tried the ATC diagnostics check and came up with no fault codes

any help would be greatly appreciated

Thanks

Nick

SD1too · 25th January 2012, 18:33

Nick,

When you bled the cooling system did you raise the expansion tank as high as possible?

When you released the expansion tank cap, was there sign of pressurisation?

Simon.

Nickc10 · 25th January 2012, 19:02

Quote:

Originally Posted by SD1too

Nick,

When you bled the cooling system did you raise the expansion tank as high as possible?

When you released the expansion tank cap, was there sign of pressurisation?

Simon.

We just left it where it was when filling but yes it was pressurised, also changed the cap for good measure but same thing......

Thanks for the help buddy, really appreciated

Nick

COLVERT · 25th January 2012, 19:40

Could be the thermostat failed in the open position.

Where does the needle on the temperature gauge in the car run at ?

Should be the 9 o'clock position.

Nickc10 · 25th January 2012, 19:50

Quote:

Originally Posted by COLVERT

Could be the thermostat failed in the open position.

Where does the needle on the temperature gauge in the car run at ?

Should be the 9 o'clock position.

yeah, used the digital temp on the dash aswell and it runs around 100 which i thought was a bit high but the temp needle stays at half, motorway runs is at 95/96

had a look at thermostat aswell and theres no signs of coolant in the v so its not leaking,

another thing ive found which i am not sure is right is, the 2 pipes going into the bulkhead, the top 1 gets lukewarm and the bottom one gets hot, is this right?

Thanks again guys

Nick

Nickc10 · 25th January 2012, 20:47

just need some ideas of things to try for tomorrw guys,

anything?

anything at all?

HarryM1BYT · 25th January 2012, 21:13

Quote:

Originally Posted by Nickc10

another thing ive found which i am not sure is right is, the 2 pipes going into the bulkhead, the top 1 gets lukewarm and the bottom one gets hot, is this right?

Nick

No, both should be hot. Seems it could be an airlock preventing flow.

Nickc10 · 25th January 2012, 21:50

Easiest way to remove an airlock?

Thanks

Nick

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I am here: http://maps.google.com/maps?ll=53.516513,-2.476368

SD1too · 25th January 2012, 21:51

Quote:

Originally Posted by Nickc10

We just left it where it was when filling ...

I'd suggest that you bleed the cooling system again but with the expansion tank raised as MG Rover specifically states for the KV6. The full procedure is in Haynes. This is the easiest way to remove an air lock.

Simon.

Nickc10 · 25th January 2012, 22:11

Thanks buddy, will try tomorrow
Thanks

Nick

---
I am here: http://maps.google.com/maps?ll=53.516632,-2.476285

25th January 2012, 16:40	#1
Nickc10 Newbie ZT and ZR-T Join Date: Jan 2012 Location: Manchester Posts: 25 Thanks: 0 Thanked 0 Times in 0 Posts	Cold heaters... please help :( Ok so ive been looking through the forums for a while and this is my 1st post recently bought a 2005 ZT 190 with 64k and full service history only problem is.... the heaters are cold :S got told this could be a problem with the heater matrix so i took it out, cleaned it thoroughly until it was getting hot all over and put it back in still cold..... thought it may be an airlock so continued to bleed system through and still nothing.... until....whilst engine was running i undid the cap to see how much pressure was in the system and low and behold... HEAT! But when u tighten the cap back on it goes cool again, i am completely stumped... also just tried the ATC diagnostics check and came up with no fault codes any help would be greatly appreciated Thanks Nick Last edited by Nickc10; 25th January 2012 at 17:37..

25th January 2012, 18:33	#2
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,405 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Nick, When you bled the cooling system did you raise the expansion tank as high as possible? When you released the expansion tank cap, was there sign of pressurisation? Simon. __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

25th January 2012, 19:40	#4
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	Could be the thermostat failed in the open position. Where does the needle on the temperature gauge in the car run at ? Should be the 9 o'clock position.

25th January 2012, 20:47	#6
Nickc10 Newbie ZT and ZR-T Join Date: Jan 2012 Location: Manchester Posts: 25 Thanks: 0 Thanked 0 Times in 0 Posts	just need some ideas of things to try for tomorrw guys, anything? anything at all?

25th January 2012, 21:50	#8
Nickc10 Newbie ZT and ZR-T Join Date: Jan 2012 Location: Manchester Posts: 25 Thanks: 0 Thanked 0 Times in 0 Posts	Easiest way to remove an airlock? Thanks Nick --- I am here: http://maps.google.com/maps?ll=53.516513,-2.476368

25th January 2012, 22:11	#10
Nickc10 Newbie ZT and ZR-T Join Date: Jan 2012 Location: Manchester Posts: 25 Thanks: 0 Thanked 0 Times in 0 Posts	Thanks buddy, will try tomorrow Thanks Nick --- I am here: http://maps.google.com/maps?ll=53.516632,-2.476285