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Discussion Starter #1
Gday guys,

I've just got a question for anybody running dual fuel in their gq. Where does your temperature needle sit at operating temperature? Mine often climbs above the halfway point, does anybody else experience this? Was wondering if this was normal, or a cause for some concern.

Cheers
 

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Mine is above half on petrol or LPG. I don't consider it an issue, it still seems to run cool enough.

Kev
 

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Mine sits between a quarter and half, on cold to warm, closer to half, on extreme heat and pushing it up steep hills with ac it will just go over half. Its a auto with external trans cooler with a manual heavy duty copper radiator.ive replaced most of hoses, but yesterday could smell hot fluid.

Checked system and had a pin size hole in the hose from the thermostat to water pump housing.
Looks like a question mark. Could not get it anywhere but Nissan. 25 bucks. Nissan also gave me a exploded view of all cooling system, but without part numbers, he said they were part codes- used by them to find part number??? Crazy.

Hope this info helps
 

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When I am on the coast it sits about 1/4 to 1/5 of the way up so it seems really cool but will rise if I am going up big hills reving to like 3 to 4k..

Out in Mt Isa in 45 degree heat in 1st low range with aircon on 3 it will move right up to the hot line but will not overheat. This is with shade cloth across the front and 240mm XGT's. Normally it will sit half way or a bit higher on the highway with aircon on 2 or 3.

Things that will affect temp readings. TB4.2 on gas, 33's, 3" lift, 3.9 ratios.
 

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Temp

Your problem was sending me spare before christmas.Normal operating temp on mine which is auto and gas is anywhere between half or below but towing caravan to S.A at Xmas in 35 deg heat saw temp sit just above half whilst driving.Only problem was when we pulled over to have a drink the damn thing went to the line under 'H'.I thought I was going to cook it.It never overheated.Sussed out rad guy in Berri and he says he gets heaps of these and the way to fix prob if worried about is to fit 3 core rad.He also said these cooling systems also run right on the limit.I asked him about thermo fan but said you would not need it.Hope this helps.Brett
 

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Hi,
My GQ wagon, auto with external trans cooler, 33" muds, 2" lift, straight LPG, just fitted brand new 2 core radiator, I am running twin AU Falcon thermo fans.
Just did a trip up to Western Victoria towing tri-axle stock trailer on the weekend, temp guage sat at about 1/4 most of the trip, only climbing to 1/2 on a few of the steep hills, once up the hills guage went back down to 1/4. While traveling at night sometimes turned thermo fans off, temp still sat at the 1/4 on guage.
On return trip back home we had a 2 year old beef steer in front of trailer, then in back we had a heap of furniture loaded to the top, once again temp only went from 1/4 upto 1/2 when going up the cuttings near Bacus Marsh and a couple of other steep hills. Hope this is helps.
 

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Mine sits between a quarter and half, on cold to warm, closer to half, on extreme heat and pushing it up steep hills with ac it will just go over half. Its a auto with external trans cooler with a manual heavy duty copper radiator.ive replaced most of hoses, but yesterday could smell hot fluid.

Checked system and had a pin size hole in the hose from the thermostat to water pump housing.
Looks like a question mark. Could not get it anywhere but Nissan. 25 bucks. Nissan also gave me a exploded view of all cooling system, but without part numbers, he said they were part codes- used by them to find part number??? Crazy.

Hope this info helps
Ive had this issue with my old petrol/gas 4.2. you are right, cant get that hose anywhere. $25 is robbery, but you dont really have a choice.

Make sure you check you belt tensions, the belt often streches and every now and then flexes enough for the edge of the belt to rub on your 'question mark' hose causing the pin hole. (pin hole was at the front wasnt it?;)) Also cut about 10mm off the top of the hose, which pulls the bend away from the belt and it'll will never hit it again :D

Hope this helps
Glen
 

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mine runs at half when on the highway
quarter round town
and goes up to 3/4 on the highway with air con on
gives me the ****s worrying about it but apparently thats where they run
 

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Ive had this issue with my old petrol/gas 4.2. you are right, cant get that hose anywhere. $25 is robbery, but you dont really have a choice.

Make sure you check you belt tensions, the belt often streches and every now and then flexes enough for the edge of the belt to rub on your 'question mark' hose causing the pin hole. (pin hole was at the front wasnt it?;)) Also cut about 10mm off the top of the hose, which pulls the bend away from the belt and it'll will never hit it again :D

Hope this helps
Glen
Top tip mate bout cutting a bot off, belts are tight,but ur right, its on the front, but I thought that would b the weakest point anyway being the outside curve.
When I was putting it back on i was like, damm that is close to those fast moving belts but did the she'll be right mate.think I will trim it soon. Did last proably 15 years. Thanks mate for the advice.
 

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no worries at all mate. I did the same thing, only realised it was so close when replacing it. as you say the bend is prob the weakest point and it will last a long time, but triming a lil off will stop it happening again and these things often happen in the worse possible place.

if you look at the pin hole closely you will find a small square edge from the side of the belt.
 

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Mine sits wherever it bloody well wants to.
Don't base any decisions on the factory gauge. Put a good quality after market one in.
 

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Discussion Starter #13
thanks very much for the advice everyone, really appreciate the help!

on that note, what are your opinions on snorkels helping with engine cooling? i have a snorkel i got from a wrecker but haven't gotten around to fitting it. i've heard that because air is rammed into the snorkel it helps keep the engine running cooler???
 

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mine sits on half, has never gone over that, also has hose coming from rear of head and joins onto hose from thermo housing to radiator, dont think its factory fitted but seems to work
 

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Mine sits wherever it bloody well wants to.
Don't base any decisions on the factory gauge. Put a good quality after market one in.

Mike's right, get some thing like a Engine Watchdog TM2 for about $150.00 off evilbay.

Gets you out of the vague, stick in the ground for telling time world, and into the realm of scientific data and fact.....also peace of mind!:)
 

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Mike's right, get some thing like a Engine Watchdog TM2 for about $150.00 off evilbay.

Gets you out of the vague, stick in the ground for telling time world, and into the realm of scientific data and fact.....also peace of mind!:)
Can you use the engine watchdog TM2 to switch on the thermo fan if the temp gets too high? Mine is connected to the A/C and only comes on when the A/C button is pressed and the fan is switched on. I have an 89 Mav cab chassis.
 

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In Melb here over the past few days mines been right up near hot... gotta have the AC flatout!! .

Bloody gauge is so off it's not funny. Ill be just fitting a speco gauge or something middle range like that. Reminds me i must do that soon.
 

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Mine just sits over 1/4 all the time that's dual fuel 3inch lift and 35s but I have recently flushed the motor and radiator
 

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Mine will go just over half way on the guage when I am towing on a long hill (30deg day).

I have the ECUtalk digital readout and it says the engine temp is 83Deg at that point. Normal running around town sees 77-81 deg.

I always make sure I do a radiator flush and new coolant every 12 months.

I did recently replace my fan clutch and it made a difference.
 

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mine sits on cold and moves 1/2 way between cold and 1/4 mark when towing uphill wth ac on on a 34 plus degree day. 4.2 turbo diesel using all metal radiator
 
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