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5th July 2015, 22:45 | #1 |
Newbie
MG ZT V6 160+ Join Date: Jun 2013
Location: coventry
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overheating
The other day I had a 100 mile run in my v6 zt. All was fine except the fan seemed to be on more then normal. Being a hot day didn't think much of it. Got home after the run and turned the car off for an hour. Decided to pop to the shops. After about 5 miles I noticed the temp gage was in the red!! So turned the car off and waited 5 minutes. Started and drove and a mile later happened again.
I then opened the bonnet and felt the radiator which was stone cold. The top hose on the radiator and the header tank were also stone cold. I then opened the cap on the tank to find a lowish fluid level but I idled the car at 2k. At this point the fluid came out the top of the header tank. I then put the cap back on and drove it for 5 miles with no overheating problem. I stopped and checked the radiator and top pipe which were now red hot. I later checked the coolent level and had to add around half a litre. Since doing this the fan rarely kicks in but I tested it and it does kick in at 100. The last 2 times iv drove and stopped iv checked the coolent level and iv had to top up about 100-200ml each time but haven't had any overheating problems. Iv looked into the v and can't see any signs of leaking coolest. Just wondering if anyone had any ideas. What might be causing the problems. Last edited by gillorasp; 5th July 2015 at 22:48.. |
6th July 2015, 08:09 | #2 |
Gets stuck in
Rover 75 Connoisseur 2.5 V6 auto Join Date: Jan 2008
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I've just been hijacking this thread with something that sounds similar:
http://www.the75andztclub.co.uk/foru...d.php?t=220071 Basically I found the fault was the small dia hose that commects to the side of the filler neck on the expansion tank. Though this is of an o/d about the same as a little finger, the hole through the plastic to the neck is only 1mm ! This was blocked on mine, and it took me about an hour to clear it through. Once done, everything ok. Seems that the water in the radiator expands when hot, going through this pipe to the spare space in the header. Once the radiator cools it will return from the header. If I've got this right, with a blocked pipe, the radiator pressure increases, with water going the other way round the system it is forced out of the expansion filler cap. This in turn allows overheating. Whatever, clearing the 1mm hole cures it! Difficult to see unless you remove the header tank though. Stewart |
6th July 2015, 09:51 | #3 | |
This is my second home
Rover75 and Mreg Corsa. Join Date: Nov 2006
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Quote:
TC |
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6th July 2015, 10:15 | #4 |
Newbie
MG ZT V6 160+ Join Date: Jun 2013
Location: coventry
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Just an update. Took the 5 mile trip to work this morning. Car got up to temp and stayed bang in the middle. Just checked the fluid and it's stayed put at the max. Hopefully it was just an airlock. I think I need a longer run with temps.up to 100 tho to really test. Iv only owned the car a month or so I'm just wondering if the 0revious owner was running it around with no fluid on it and me adding a little bit when I first got it has caused a airlock.
Will report back after more road miles. |
6th July 2015, 10:19 | #5 | |
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Rover 75 Saloon 2.5 Join Date: Jul 2012
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Quote:
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6th July 2015, 11:00 | #6 |
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MG ZT V6 160+ Join Date: Jun 2013
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Thank you. I will get on this hopefully when I get home tonight.
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7th July 2015, 06:59 | #7 |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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And here it is Matt (gillorasp). Follow the procedure exactly; don't cut corners or miss anything out and if you have an air lock it will get rid of it.
If you still have problems check the small bleed orifice in the header tank neck as described by StewartIngram. Whatever it does, it needs to be clear and not blocked. Simon
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"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
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