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Ross Pesina
DieHard
Vic
Soarer V8, Soarer T, Soarer TT, Supra TT.

Posts: 612
Reg: 08-2006

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Wednesday, March 28, 2012 - 09:32 pm, by:  Ross Pesina (Ross79) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I've got a 91 Uzz31 and it randomly overheats.
Car is completely stock.
I have done a full service, new water pump, tensioners, radiator reconditioned with new top tank, pressure tested, etc. New thermostat also.
I have re-sealed the plate on the side of the block known for leaking.

When I first drove the car after the service it overheated. I had it pressure tested, also did a coolant gas analysis to see if it's a head gasket.
No milky oil, etc.
After having it overheat a few times it decided to behave. I check coolant level every morning and it sits where it should.

Then a week later while driving to work it decided to overheat again. Switching the heater on dropped it a bar, but as I pulled into the car park I could see steam coming out. Once it cooled down I ended up having to add 4 Litres of coolant.
This was over a week ago and so far hasn't overheated again. Any ideas??
Ali Saeed
Goo Roo
WA
1994 Honda Accord M/T

Posts: 3834
Reg: 09-2007

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Wednesday, March 28, 2012 - 10:57 pm, by:  Ali Saeed (Ali) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

are you sure the top tank hasnt cracked again?
Jamie Richards
TryHard
St.john's
v8

Posts: 188
Reg: 06-2009

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Thursday, March 29, 2012 - 01:59 am, by:  Jamie Richards (Nwb40gt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

check thermostat housing if sealed good if not fully sealed will leak very slow.You should check coolant pipe the run's under intake manifold those pipe have a tendency to leak after a water pump change
Dave Rose
Goo Roo
wa
UZZ31 / ML320 CDI

Posts: 1876
Reg: 03-2007

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Thursday, March 29, 2012 - 08:44 am, by:  Dave Rose (Sand_groper) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

sound like your new thermostat is sticking, put the old one back , to find out
Ross Pesina
DieHard
Vic
Soarer V8, Soarer T, Soarer TT, Supra TT.

Posts: 613
Reg: 08-2006

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Thursday, March 29, 2012 - 08:50 am, by:  Ross Pesina (Ross79) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

It's a brand new top tank. Definitely hasn't cracked again.
We had a pressure tester on it over a dozen times with both hot and cold engine. Does not lose any pressure even after 20mins or so.
Not a single leak anywhere even thermostat housing is perfectly sealed.

I have even run it without a thermostat incase the new one is dodgy but it still overheated! So I put it back in. Was fine for about a week before overheating again.
Now I've been driving it a week with thermostat back in and giving it the occasional workout and it has been trouble free.
Eugene Smith
Tinkerer
Qld
V8

Posts: 13
Reg: 02-2012

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Thursday, March 29, 2012 - 01:02 pm, by:  Eugene Smith (Eugene) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi where did you buy the top tank I need one too?
Ross Pesina
DieHard
Vic
Soarer V8, Soarer T, Soarer TT, Supra TT.

Posts: 614
Reg: 08-2006

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Thursday, March 29, 2012 - 01:12 pm, by:  Ross Pesina (Ross79) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I always take mine to natrad. They ordered one in from whoever their supplier is.
James Johnson
DieHard
Auckland
UZZ31 Soarer x2

Posts: 521
Reg: 03-2009

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Thursday, March 29, 2012 - 01:32 pm, by:  James Johnson (Jimbo) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Ross, just making sure but I guess that the only way to correctly check the coolant level is to undo the 17mm bolt on top of the thermostat housing and have a look in there as the radiator cap is on the overflow bottle effectively. Also have you checked to see if the radiator is not blocked?
Ross Pesina
DieHard
Vic
Soarer V8, Soarer T, Soarer TT, Supra TT.

Posts: 615
Reg: 08-2006

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Thursday, March 29, 2012 - 07:41 pm, by:  Ross Pesina (Ross79) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi James, that's the way I fill it. I undo the big bolt on the thermostat housing and poor the coolant in. Once that's overflowing I top up the overflow to the full level.
The radiator is like new. Fully reco'd. Although I will try dumping the coolant again, all I can think of if there's some rubbish flowing around occasionally blocking a passage and causing it to overheat due to lack of flow?
Jamie Richards
TryHard
St.john's
v8

Posts: 190
Reg: 06-2009

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Friday, March 30, 2012 - 03:01 am, by:  Jamie Richards (Nwb40gt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

do a full flush and see what happens
Tom Richards
DieHard
nsw
V8

Posts: 979
Reg: 08-2005

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Friday, March 30, 2012 - 07:04 am, by:  Tom Richards (Tomr) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

you should have the engine running with the 17mm nut very loose so that air can escape. do not tighten the nut until a continuous stream of water is coming out, meaning all air is removed. (have the heater on when you do this)
Drew Rechner
DieHard
South Australia
:-(

Posts: 582
Reg: 10-2007

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Friday, March 30, 2012 - 07:29 am, by:  Drew Rechner (Drew1jz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Did they put a new cap on with the top tank? Sometimes its a simple as a incorrect radiator cap
Ross Pesina
DieHard
Vic
Soarer V8, Soarer T, Soarer TT, Supra TT.

Posts: 616
Reg: 08-2006

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Friday, March 30, 2012 - 08:02 am, by:  Ross Pesina (Ross79) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Tom, thanks for the tip, I will use that technique when I flush it.
Drew, I'm pretty sure I bought a new one, but will double check.
Drew Rechner
DieHard
South Australia
:-(

Posts: 583
Reg: 10-2007

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Friday, March 30, 2012 - 12:06 pm, by:  Drew Rechner (Drew1jz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Ross Pesina wrote on Friday, March 30, 2012 - 08:02 am:

Drew, I'm pretty sure I bought a new one, but will double check.




Check its the correct PSI rating for the Soarer :-)
Daniel Marshall
Tinkerer
QLD
V8 UZZ31 X2

Posts: 43
Reg: 07-2011

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Tuesday, April 17, 2012 - 10:41 am, by:  Daniel Marshall (Ydass) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

what mine would do is slightly leak from the gaskets that the water bypass is on from 1 head to the 2nd head theres 1 at front of engine and one on back of engine.

it would slowly leak and evaporate so i couldn't find the leak.

wasn't till i pulled out the motor and started ripping things off in frustration that i notice the gasket.

worth checking this and the hoses on the rear of motor/heater hoses and those little 9mm hoses what ever there for lol

they split when i tried pulling them off.

this is if you haven't fixed your problem already:-)

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