overheating 4wd while towing

Submitted: Thursday, Mar 05, 2009 at 21:24
ThreadID: 66543 Views:3256 Replies:10 FollowUps:4
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Hi..travelled in WA a while back with standard toyota landcruiser 1996 turbo towing 17ft caravan. We travel 80 to 85 kph as we found this speed greatly reduced fuel consumption. 4wd was heating up when wind was behind us. When we went into the wind it was ok. we have almost 250,000km up. Wondering if it may be water pump worn and needs replacing...or overhauling. maybe radiator needs cleaning although it looks clean and is coolant is regularly changed. or maybe a sticky fan. We have travelled extensively in the last few years and have been happy with our vehicle. Any ideas would be greatly appreciated...Julie
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Reply By: Member - Footloose - Thursday, Mar 05, 2009 at 21:31

Thursday, Mar 05, 2009 at 21:31
Julie, could be the viscous fan unit, an easy fix.
AnswerID: 352405

Reply By: Member - Dennis P (Scotland) - Thursday, Mar 05, 2009 at 21:32

Thursday, Mar 05, 2009 at 21:32
Hi Julie,
Might pay to have the fan clutch checked out.
Had the same problem on my Troopy a few years back.

Cheers,
Dennis


AnswerID: 352407

Reply By: Wherehegon - Thursday, Mar 05, 2009 at 21:56

Thursday, Mar 05, 2009 at 21:56
As above, I would say viscous clutch on the fan hub either needs replacing or topping up. Have read on here of many people topping up and having no further issues. I believe 3 tubes genuine from Toyota will be enough, you dont want to put too much in or it will lock the fan on permanantly. DONT get after market one if you decide to replace it. Toyota a lot dearer but have heard of after market ones playing up even the Davis Craig brand.........WHG
AnswerID: 352418

Reply By: Member - Wayne David (NSW) - Thursday, Mar 05, 2009 at 22:17

Thursday, Mar 05, 2009 at 22:17
juliew

I recently had such a problem & did a head gasket dragging my camper trailer up the steep range outside of Tamworth.

May I suggest that you get it along to a radiator expert for a check? Maybe something as simple as it needing a flushout.

The old 'a stitch in time.........' seems the go. Wish I'd done that. Oh well I now have a motor with a new head gasket plus a new radiator and boy do I keep an eye on my coolant level or what? You bet I do!

Good luck & let us know how you got on.
AnswerID: 352428

Follow Up By: Member - Roachie (SA) - Friday, Mar 06, 2009 at 10:59

Friday, Mar 06, 2009 at 10:59
G'day Wayne,
Could you just clarify for me please...... did your problems occur because of a loss of coolant, or just a poorly-operating/blocked radiator etc?

It's just that you said in your second last paragraph that "and boy do I keep an eye on my coolant level or what? You bet I do! "

This makes me think that you lost your coolant and cooked your motor.

If so, may I STRONGLY recommend you have a look at "investing" in one of these: Low water alarm

I have no affiliation; just a satisfied customer.
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FollowupID: 620699

Follow Up By: Member - Wayne David (NSW) - Friday, Mar 06, 2009 at 13:07

Friday, Mar 06, 2009 at 13:07
Gidday Roachie (SA)

Thanks for your interest and help. Much appreciated.

My apologies to all if I appear to be taking over this one.

I have gone to the link you provided and must admit to not having seen that particular device before. I will copy and show it to my mechanic at next service, which is due next Tuesday. In fact I'll phone him today and have him look at it on the web before I meet with him.

Based on a former 'stuff-up' where I blew a hose, I have a warning system for low water. My Early Warning System is an alarm that 'goes ape' when it senses the water below a certain level.

In the days leading up to the 'incident' on the Moonbi Range my EWS was continually going off. I'd stop to check and sometimes I needed a top-up and other times it was okay with level but still the alarm rang, which really puzzled me.

Anyway heading North from Tamworth I knew that the climb would be extremely steep and so I pulled into a Tamworth servo topped her up with water & took a break before tackling Moonbi.

On climbing Moonbi the gauge rose & was heading for the red, so I pulled over and let her cool down while enjoying a cuppa & some lunch.

Despite the levels being checked it just seemed to lose water and the alarm was going off quite a bit on the journey home.

From memory it would drink more than a litre at a time, after which we'd let her settle and head off yet again. We were puzzled as to where it was all going and thought we had a leak but there was no water dripping onto the ground.

Once home we got it up to the mechanic who initially felt (with a pressure test) that it wasn't a head gasket but a crook radiator. So new radiator installed. The alarm still went nuts & after a few days we took her back to be told the bad news that it's almost certainly the head gasket. So that was fixed.

Bottom line is that even to this day I don't know the real cause but I suspect that my original blown hose may have started the thing. Then I've hooked-up an off road CT that's over a ton compared to around 800 kg for my old on road job and then of course I've tossed in Moonbi for good measure.

I know it's a long drawn out answer and the truth is I really don't know the answer. What I do know though is that after a new radiator and a head gasket repair and me closely looking after the coolant, that all is okay.

Is there anything in what I've said that gives you a clue as to what may have caused the head gasket seal to go?

Hello Roachie are you there? Mmm I suspect the story of my life may have caused a bit of the old zzzzzzzzzzzzzzzzzzzzzzz!


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FollowupID: 620737

Reply By: PeterInSa - Thursday, Mar 05, 2009 at 22:25

Thursday, Mar 05, 2009 at 22:25
Julie,
I would have the Radiator Rodded, if you have not done it in the last 4 years. You do not say whether you have an Auto or manual, If an automatic I would look at having an additional or larger Transmission cooler.

We have a 1988 60 Series Turbo Diesel (manual) and travel at 90 to 95kph, its a bit more expensive in fuel, but seem to have no problem in going over small hills towing a 21'6" van we may drop down to 85kph, whereas if we travel at 80 to 85 we could chug over at 70kph.

I understand that the Turbos power band is in the 90 to 95Kph range. Our Vehicle has done 305,000kms

Peter
AnswerID: 352430

Reply By: juliew - Thursday, Mar 05, 2009 at 22:52

Thursday, Mar 05, 2009 at 22:52
Thanks for info..will let you know how we go..
AnswerID: 352440

Reply By: mechpete - Thursday, Mar 05, 2009 at 23:14

Thursday, Mar 05, 2009 at 23:14
if you have to buy a viscous fan hub don,t buy after market
you get what ya pay for , have a mate who got caught .
mechpete
AnswerID: 352445

Reply By: Gone Bush (WA) - Thursday, Mar 05, 2009 at 23:52

Thursday, Mar 05, 2009 at 23:52
Went through the same thing.

Do all as suggested above:

radiator flush

re-oil viscous hub

and, put new upper and lower radiator hoses on. The bottom one gets soft and is sucked thin on long slow climbs.

I bet when you backed off the accelerator the needle dropped back to normal.

I'm glad I ain't too scared to be lazy
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AnswerID: 352451

Reply By: Von Helga - Friday, Mar 06, 2009 at 10:25

Friday, Mar 06, 2009 at 10:25
JulieW
There was a post about where the individual had just about rebuilt the cooling system in an effort to cure the same problem only to find that the large spot lights that were recently fitted had disrupted he airflow through the radiator enough to change the running temp of the car.
Trev
AnswerID: 352489

Reply By: get outmore - Friday, Mar 06, 2009 at 13:45

Friday, Mar 06, 2009 at 13:45
as said the viscous hubs is always the first port of call . Probabally the most common cause
I did mine again yesterday - heres the step by step instructions
with how to identify if it is the problem

HOW TO FIX VISCOUS HUB

A NEW ONE IS OVER $500 so worth a go

with that many ks i would be looking at the rad as well for heavy towing
AnswerID: 352543

Follow Up By: kingswoodwagon - Tuesday, Mar 24, 2009 at 22:03

Tuesday, Mar 24, 2009 at 22:03
get out more,

im looking at similar overheating issues,
can i assume the procedure is the same for 60 series? at a glimpse - the bits look the same.

and is 3 tubes of genuine toyota all ill need (ill have to get it shipped to me)

cheers.
thanks in advance for the "How to Fix" instructions.


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FollowupID: 623980

Follow Up By: kingswoodwagon - Tuesday, Mar 24, 2009 at 22:04

Tuesday, Mar 24, 2009 at 22:04
sorry, im dyslexic.

2 tubes will do.

cheers again

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FollowupID: 623981

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