overheating cruiser

Submitted: Sunday, Jul 05, 2009 at 11:01
ThreadID: 70408 Views:2894 Replies:7 FollowUps:6
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hi guys
i was travelling up mt tamborine on friday night. i got about 3/4 the way up the mountain and had to pull over cause the car started to get a bit hot.

i was only stopped for a couple of minutes and it was back to normal and was fine the rest of the way up it had a new thermostat a flush and new coolant about 12 months ago and normally the temp doesnt move at all the car is a 98 105 series 4.2 diesel with aftermarket turbo and its auto as well .

i was thinking it might be the viscous hub for the fan but not sure.
i must admit though its the first time ive been up there in this car and is the steepest climb its done since ive had it.
any ideas of what the problem might be would be a great help


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Reply By: Gone Bush (WA) - Sunday, Jul 05, 2009 at 11:14

Sunday, Jul 05, 2009 at 11:14
If that's the 1HZ, with an aftermarket turbo, I'm surprised it hasn't happened before.

That is typical of a 1HZ, especially it has an intercooler in front of the radiator.

You will have to:

fill the viscous hub with 2 or 3 tubes of Toyota oil.
replace upper and lower hoses with new ones (old ones suck themselves thin on long steady climbs).
make sure the radiator shroud is intact.
give strong consideration to replacing the radiator with a larger capacity one.

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AnswerID: 373151

Follow Up By: brentos - Sunday, Jul 05, 2009 at 11:24

Sunday, Jul 05, 2009 at 11:24
yeah it is the 1HZ motor, no it doesnt have an intercooler i will look into those things
FollowupID: 640354

Follow Up By: GerryP - Sunday, Jul 05, 2009 at 19:19

Sunday, Jul 05, 2009 at 19:19
Hi Gone Bush - just wondering why you say you are surprised it hasn't happened before. I know the 1HZ with turbo has a tendency to run high EGT if you aren't careful, but haven't heard of engine cooling issues. I have a 105 with same motor and turbo (no intercooler) and have not had any issues, including some pretty heavy towing and 'playing'.

Not disputing - just curious.

FollowupID: 640411

Reply By: Member - Phil G (SA) - Sunday, Jul 05, 2009 at 12:46

Sunday, Jul 05, 2009 at 12:46
I agree with GoneBush above. It happens commonly to 1Hz with aftermarket turbos, but more commonly in the 70series.

Can I suggest you get an audible alarm system - google TM2 Engine watchdog - this is a neat device that gives you a digital temperature readout and an audible alarm when the temp goes above the limit you set. Its a good $149 of insurance. I bought mine off Ebay and it was delivered in 48hours.
AnswerID: 373160

Reply By: Karen & Geoff - Sunday, Jul 05, 2009 at 14:11

Sunday, Jul 05, 2009 at 14:11
Hi Brentos.
I was going to say I have the solution, but I re read your post. We had a patrol doing the same thing after we had the turbo upgrade thingy done to our 4.2lt, and when we towed the camper it got hot. Really annoying, and we had the radiator professionally cleaned, (wasn't really dirty they said), had Denco Diesel check it out, and they found a hose had come off.......ha ha they said that was the problem. That day was about 38 degrees so we came home and hooked up the camper trailer and took it for a drive up a hill where we know it used to nearly boil, and it still got hot. Obviously the hose was not the problem!

Anyway we fixed the problem finally..........we sold the patrol and brought the new V8 Cruiser ute. Been as good as gold, towing the camper trailer in 40 degree heat, no worries with temp at all. Both our eyes were glued to the temp gauge. I also know another patrol around here, 4.2lt, and they have the same problem we had as well.

AnswerID: 373170

Reply By: get outmore - Sunday, Jul 05, 2009 at 14:23

Sunday, Jul 05, 2009 at 14:23
Do this

replace the Silicon gel In Fan Clutch
AnswerID: 373174

Follow Up By: Member - Andrew (QLD) - Sunday, Jul 05, 2009 at 18:34

Sunday, Jul 05, 2009 at 18:34
probably would work better with silicon oil, rather than gel. :)

FollowupID: 640408

Reply By: Dremus - Sunday, Jul 05, 2009 at 14:49

Sunday, Jul 05, 2009 at 14:49
I ran an 80 series with denco turbo, no intercooler for 4 years without any trouble. I now have a 105 with denco turbo and I had a temp problem on hill climbs and heavy towing, that seemed to appear over night. I replaced the radiator, as it was getting sad and thermostat aswell, but it did not fix it.

It was the clutch fan all along. The hub had split and I lost the oil. I just bought a new hub for around $140 and bolted it on. 1/2 hr job, all fixed.

If you know what you are looking for you will be able to see the fan kick in. The only problem I had was that there wasn't a problem with day to day drivin around town and could go unnoticed for months. Only once you go for a decent drive in the hills or try to maintain 120 on the freeway, would the temp rise, and only come back when I backed off.
AnswerID: 373184

Follow Up By: iccey_1969 - Sunday, Jul 05, 2009 at 18:20

Sunday, Jul 05, 2009 at 18:20
I have a 1HZ 4.2 and been in the same situation and still am!
Before i turboed the motor, it was doing that very same thing on the long hills.
then i put in the turbo and denco intercooler and does the same thing on ths same hill just the same. So nothing to do with the turbo.
Changed to the PWR aluminium radiator high performance made no difference.
Added 2 and a half tubes of viscus fluid to fan, Still the same! then i purchased a new fan hub thinking i didnt do the job right, and still no better.
had the head off and nothing cracked or damaged there!. i lifted the bonnet at the brackets half an inch to alow more air flow. still nothing!
Stuffed if i know, my best mate has the same cruiser as mine and he has an after market turbo with a denco and his never moves past half way on the tem guage, even pulling a 2 ton trailer flat out up the same hill! he even has his boost on 14 psi and fuel wound up. he said he has got the EGT around the 500 deg c mine only gets to 470 max.
Im with you mate, but if you do find some information about sorting this out do let me know!
FollowupID: 640405

Follow Up By: Dremus - Sunday, Jul 05, 2009 at 19:21

Sunday, Jul 05, 2009 at 19:21
My 105 is running 12 psi and my egt has gotten to 550 on the very odd occasion but this did not affect the engine temp at all, to my surprise.

You must has to push it a bit hard and hotter to get the egt to translate into engine temp increase, or perhaps sit on 550 for a while, which I never would do.

Have you looked at your water pump and thermostat? They say the water pumps on the 1HZs are really good and very few have problem, but if you are getting heaps of airflow and heaps of water circulating I think there should be a problem, seeing as you've already had the head off.

The only other thing may be the gauge, but that is along shot.

I know how you feel trying to pin down the problem and it is frustrating when you don't have money tree in the back garden...

Keep me posted!
FollowupID: 640412

Reply By: Member - Toyocrusa (NSW) - Sunday, Jul 05, 2009 at 19:25

Sunday, Jul 05, 2009 at 19:25
Hi.I'm sure someone on here recently had similar problems and worked out driving lights were restricting the air flow through the front. May pay to check this area as well. Regards,Bob.
AnswerID: 373218

Follow Up By: Wherehegon - Sunday, Jul 05, 2009 at 22:22

Sunday, Jul 05, 2009 at 22:22
Hi there Toyocrusa, yes I remember the same post, about driving lights been the exact problem.. I suppose if you think about it, if a certain area of the radiator is been blocked by the driving lights (lets say the centre of it where the coupling sits) the air passing through maybe only getting to the sides/top/bottom of the radiator and not to the centre so the viscous coupling will not be getting any air passing over it to detect the temperature of the air coming from the radiator there for it would not lock the fan in to pull the air through ??? Just my theory lol............Regards Steve M
FollowupID: 640441

Reply By: howesy - Sunday, Jul 05, 2009 at 19:54

Sunday, Jul 05, 2009 at 19:54
What are you measuring the temp with? A lot of guages are not accurate at all. I would second that suggestion of buying a TM2 or even get a thermal or infra red gun and look for hot spots in the block and head which may relate to a blockage. Have known of engine blocks choking up from casting sand not cleaned out properly in manufacture, was in a different make V8 but still it does happen (slim chance though). get a gun and or a TM2 and get some accurate readings.
By the way my 1HZ with aftermarket turbo runs 12psi an Aussie Desert Cooler triple bypass an untouched viscous hub and fan with cowling, no intercooler with
A/C and twin 8" lights in front and it runs about 1/4 to 1/3 on the guage on the steepest climb it will get to a little under half way and holds there and once over the top cools to 1/3 or less within 1 km. Hope some of this helps to compare.
AnswerID: 373226

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