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 SOLUTIONS to 1KZ-TE Overheating?

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brierly89



Number of posts : 10
Home City : Adelaide, South Australia
Model and year : Toyota HiAce Super Custom G 1998 3.0L Disel Auto
Registration date : 2016-12-22

PostSubject: SOLUTIONS to 1KZ-TE Overheating?   Mon Jan 09, 2017 10:24 pm

On my 1998 2WD Hiace Super Custom 3.0L Turbo Diesel, I have noticed the temperature climbs when going up hills on hot days.... This is not good as I live in Australia, where it gets very hot... Over 40C during a heatwave... I have read horror stories of overheating and cracked heads... The area I live in is full of hills. The temperature concerns me as I plan to soon fit roof racks, bull bar, side awning, which will all put more stress on the engine.

Has anyone actually found a SOLUTION to better cooling the 1KZ-TE engine?

I see that someone managed to fit an aftermarket transmission cooler, but not sure of what their outcome was. People on the Toyota Surf forums (same engine) have found that some are fitted with radiator whose outlet is significantly blocked (by the trans cooler pipe)  Shocked  - although having a look at some photos of the Super Custom's radiators they seem to be a different design....
LINK: http://www.toyotasurf.asn.au/forum/viewtopic.php?f=7&t=195  study

I plan on installing a more accurate digital thermometer (although tossing up between coolant one vs external engine one).

It seems to be an issue with all Hiace Super Customs - especially 4WD - I believe my cooling system is performing as normal, but I will have my mechanic check the vicious fan and eventually I'll have a more thorough flush / clean of the radiators (just had coolant flushed and replaced by mobile mechanic, but assume a radiator specialist can do a better job in a shop).

Has anyone found a SOLUTION? I would love to find a fix as I love the look and functionality of the van. It also drives great!
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Hiace4wd



Number of posts : 280
Home City : Netherlands
Model and year : 1994 Toyota Hiace 4x4 DIY camper
Registration date : 2016-02-01

PostSubject: Re: SOLUTIONS to 1KZ-TE Overheating?   Tue Jan 10, 2017 12:26 pm

Why didn't you continue in the previous topic? Or are you asking something different now?

I think the best way is too keep everything in good condition. Because when it was fresh from factory, I'm sure it wouldn't overheat. Because I don't know any other Toyota that overheats in hot conditions, they are usually very good when it comes to cooling.

You could also fit a thermostat that opens earlier at a lower temp.
And modify the visco fan so that it starts working earlier.
Or add an electrical fan which you switch on manually or by an electrical thermostat which you put on the engine head or something like that.
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brierly89



Number of posts : 10
Home City : Adelaide, South Australia
Model and year : Toyota HiAce Super Custom G 1998 3.0L Disel Auto
Registration date : 2016-12-22

PostSubject: Re: SOLUTIONS to 1KZ-TE Overheating?   Wed Jan 11, 2017 12:52 am

Hi Hiace4wd.

My previous topic was in regard to modifying the stock thermostat. I thought it would be good to start a thread to discuss a wider range of options and see if anyone has had success in hotter climates with preventing the temperature rising on hill climbs / towing etc...

It seems that it is a common occurrence here in Australia. Our summers are very hot. It may not be an issue for you up there in the Netherlands.

Thanks for the suggestions!

I'll ask my mechanic to add some more oil to the viscous fan =)

I've read various things about changing the thermostat, but mosty people seem to say it doesn't make a difference.. The stock one is wide open at 88C so once the engine heads towards temperatures above that the thermostat is already wide open, thus a 76C thermostat should make any difference.. Maybe I am wrong though...

Interesting point about adding a fan. I assumed there wouldn't be any room in the engine bay for that.
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Hiace4wd



Number of posts : 280
Home City : Netherlands
Model and year : 1994 Toyota Hiace 4x4 DIY camper
Registration date : 2016-02-01

PostSubject: Re: SOLUTIONS to 1KZ-TE Overheating?   Wed Jan 11, 2017 8:50 am

You may be right on the thermostat. It may just give you a bit of extra buffer in terms of having a engine that is 10 degrees C colder before you start going up a hill with the trailer.

In the Netherlands we don't have hills and extreem temps no Smile
And the 1KZ engine is not common here, specially not with automatic. I know one guy who was very negative about the engine, not about the power and such, but about the cooling issues.

However, the 2L and 3L engine (codes) can get cracked heads to if the cooling is not sufficient.

And from the Netherlands I can drive through France, which I did in a heatwave. So with a loaded camper van going up a hill with 40 degrees C outside... So I know the feeling.
However mine did not overheat, even though there wasn't nearly enough coolant in the system. I found out about that later, couple of days after holiday, when I noticed that all the coolant was thrown out via the radiator cap. And it started overheating in normal conditions. Then I replaced the cap, the hoses, and flushed the coolant, and didn't have any issues.
By the way, I can clearly hear the visco fan engage a lot of times when I'm trashing it on the highway. That means driving faster than a 100km/h, like 110 or so. That may not seem like fast, but my van has a high roof, and the 2L engine has no turbo, it needs to work hard.

But as said in one of the other topics. I think the 1KZ has a small design error which can lead to a cilinder not being cooled enough.
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Fang



Number of posts : 12
Registration date : 2008-11-22

PostSubject: Re: SOLUTIONS to 1KZ-TE Overheating?   Sat Jan 14, 2017 5:01 am

my instrument panel temp guage is always normal, even in hot weather.
so, I fitted an extra temp guage and that can get up to 220 farenhite on a hot uphill run.
so, I have removed all undercar covers to give the hot engine air somewhere to escape.
I am also now checking the tension on the fan belts and water pump, they need to be firm to ensure they are not slipping at higher rpm
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PostSubject: Re: SOLUTIONS to 1KZ-TE Overheating?   Today at 8:27 am

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