SSSimon
X-TRAIL NEWBIE
Date Registered: 06-2013
TOTAL POSTS: 15
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Overheating issue
Hi All, I have a 2001 T30 which is having on-going overheating issues.
So far I have changed the radiator, which helped a bit, and the thermostat, which also helped, but it is not yet back to perfect.
I know the Xtrail has 2 thermostats, but am not sure how to access the 2nd thermostat - the Water Control Valve.
With the radiator and T-stat (base of the top radiator hose) changed the car drives as normal, but on a hill the temp will spike. If I hit the demist button the temp drops, and if I back-off or go downhill the temp also drops.
I'm thinking that it can only be the Water Control Valve because I know the radiator is good, new coolant, and the top T-stat is good.
The engine is running like a clock, no noises or slipping belts.
I would like to change the WCV but don't know it's location. Can anyone advise?
Thanks in advance,
Simon C.
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4/Jun/2015, 1:06 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re:
So you changed the head gasket?
Have you done a compression test on the engine block to see if everything is OK?
Last edited by jalalski, 4/Jun/2015, 4:36 pm
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4/Jun/2015, 4:33 pm
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SSSimon
X-TRAIL NEWBIE
Date Registered: 06-2013
TOTAL POSTS: 15
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Re:
Hi Jalalski,
are you talking about the problem I had 18 months ago? Yes, in a way, I did an engine exchange. The headgasket is good. Engine is running perfectly, coolant is clean & green, engine oil also clean, exhaust colour is good.
I suspect the Water Control Valve is at the engine block end of the lower radiator hose, just below the exhaust manifold.
Can anyone confirm, or post a diagram of the Water Control Valve (2nd thermostat) of the Q25 engine?
Thanks & regads,
Simon C.
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4/Jun/2015, 8:00 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Overheating issue
Hi Simon,
Yes, I thought you're still battling that old engine of yours, as you never told us that you've done a swap since you reported problems with it.
Anyway, here a copy from the ESM showing the location of the WCV:
To get to the WCV you will need to drain the coolant. Make sure you're using a Genuine Nissan coolant and nothing else.
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4/Jun/2015, 8:15 pm
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Revhead Kev
Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: Overheating issue
Have you checked the fan operation ?
There are 2 fans as you know, one for normal temp control and one for the aircon.
Maybe one of them is not working ?
--- Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
My CarPC Worklog
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5/Jun/2015, 9:37 am
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