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2000 gu patrol 4,2 heating problems?

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2000 gu patrol 4,2 heating problems?

my patrol is a 4.2 turbo
my problem is i cant find out wot is causing it to heat
i have cleaned its raidator replaced it thermostst and a new vicous hub on fan

.its water pump i found some meatel eroded from under the bypass valveand fixed that
all this has made no defrance at all
it cas a huge transmisson cooler on it to
lost on were to go now .any adeas welcom

Unread postby greg naylor » May 19th, 2011, 2:43 pm


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Re: 2000 gu patrol 4,2 heating problems?

First of all identify if its overheating or the gauge is just telling you that its overheating.
You also need to supply a bit more information to get others to help you out.

What are the signs of overheating that you are observing?
Is it overflowing from the radiator overflow?
Steaming?
Smelling?
None of the above but the gauge is up etc.

Some problems look like overheating initially but could be a different problem.
e.g. blown head gasket.

Does the car have power?

The more information you provide on the symptoms the faster you'll have an answer and the more accurate it will be.

Unread postby FZR1KG » May 19th, 2011, 4:17 pm


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Re: 2000 gu patrol 4,2 heating problems?

the guage has been tested
and found to be fine
the moter is not using any water and tests show no exaust gases in the rad system
we tested the thermostat housing with a thernal gauge .it was reading 110c at thermostat housing the rad top tank was reading 88c and bottom of tank was 86c have nissan mechanics baffeld
smells hot and when using heater to help kool the system cant hold hand over vent as its to hot
the car has all its power and preforms well dosnt make any diffrance wot the outside temp is either
checked 4 blocked exaust system but its good
the patrol has 230000 kms on the clock
the gauge gets almost to the hot mark if i dont back off .seems to stay cooler if i rev it a bit on the hills instead of lugging it up
im not driving it very hard when its doing the heating and dosnt take long to get hot
its got me buggard thanks guys

Unread postby greg naylor » May 19th, 2011, 4:58 pm


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Re: 2000 gu patrol 4,2 heating problems?

if its goining alright revving it up a hill instead of labouring it maybe it has something to do with over fueling?

Unread postby highoctane » May 19th, 2011, 6:15 pm


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Re: 2000 gu patrol 4,2 heating problems?

you have checked the thermostat havent you??

Oops just read the first post again........ sorry

Is it running std tyres/diffs? Havent added new bullbar/winch/spotlights recently??

Unread postby Im_where?? » May 19th, 2011, 6:16 pm


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Re: 2000 gu patrol 4,2 heating problems?

nothing new to truck tyers are 285/75/16
have only had truck 4 2 months

it seems to me to be like water flow is restricted in block
it sounds like its had a histery of over heating
any ideas about restrictions in block or head
we might start pulling head off next week
nothing left to do except pulling apart
dealer seems to think that its fueling right

Unread postby greg naylor » May 19th, 2011, 6:59 pm


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Re: 2000 gu patrol 4,2 heating problems?

Its just puzzling that its 110c at the thermostat and 88c in the top tank. its like the thermostat isnt opening. did you check the new one in boiling water to check it? (not something you normally do i know)
and then there to only be a 2degree drop across the rad.

Do you have an EGT guage?
How did the dealer check the feuling?

Im not too familiar with the td42 but i cant see how there would be a restriction in the head or block.

Unread postby Im_where?? » May 19th, 2011, 7:15 pm


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Re: 2000 gu patrol 4,2 heating problems?

yes heve checked thermostst
it opens at about 85c
thay dont have a gas annalyser im y area
am in lower south island of nz
but the guys seem to know there stuff
no dont have a exuast temp guage

Unread postby greg naylor » May 19th, 2011, 8:20 pm



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