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 SOLUTIONS to 1KZ-TE Overheating?

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brierly89
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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
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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
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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
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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
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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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brierly89
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Model and year : Toyota HiAce Super Custom G 1998 3.0L Disel Auto
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PostSubject: Re: SOLUTIONS to 1KZ-TE Overheating?   Wed Mar 01, 2017 1:33 am

So a bit of an update from me,

After owning the van for a few months I can confirm that any long hill climb, no matter the summer temperature (I am yet to drive in cooler weather), the van will 'overheat'... By overheat I mean run hotter than it should, the temperature gauge starts to climb after a long delay. At which point I crank the heater and back right off the accelerator or even pull over. I have had this happen enough to know that I need to keep my foot on the accelerator as light as possible when doing hill climbs - and it still happens...

Rather annoying to own a van with a massive 3.0L Turbo diesel that can't get up to speed on any long hills...

My thought are,

- replace the thermostat
- top up viscous fan oil
- install digital thermometer in coolant path
- see if it's possible to install an intercooler

I have some other work to do on it first, so see how long this takes me.. Or more specifically my mechanic..

Are there fan belts used to cool the engine? My understanding was that there is only the vicious fan and an electric fan on the lower radiator?
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GPW
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Year: 1996
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Trim: FN42

Registration date : 2016-07-16

PostSubject: Re: SOLUTIONS to 1KZ-TE Overheating?   Wed Mar 01, 2017 11:18 am

brierly89 wrote:

My thought are,

- replace the thermostat
- top up viscous fan oil
- install digital thermometer in coolant path
- see if it's possible to install an intercooler

I have some other work to do on it first, so see how long this takes me.. Or more specifically my mechanic..

Are there fan belts used to cool the engine? My understanding was that there is only the vicious fan and an electric fan on the lower radiator?

The lower rad is interesting, it's just in series with the vertical rad with the viscous fan - the water comes out the bottom of the main rad on the drivers side and straight into that lower one - so if that electrical fan is faulty you may also get an overheat. Directly under the lower rad is the air conditioning rad - so the A/C will (also?) drive that electric fan. I'd need to see a wiring diagram to see if that lower fan is also driven by engine temperature - I suspect it would make quite a big difference. Perhaps a relay somewhere is used for that too.

Worth a good hoover in there too make sure the air can get through the two lower rads.

I agree with your first 3 points - worth doing a coolant flush when the thermostat is done too.

I suspect your first 2 points are the cause of the overheat but I'm following closely as I may do some pre-emptive maintenance to mine as I have the same engine. It's not known for overheating IIRC so I'd suspect a fault waiting to be fixed.

BTW an intercooler will generate more power ;D
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brierly89
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PostSubject: Re: SOLUTIONS to 1KZ-TE Overheating?   Thu Mar 02, 2017 4:28 am

Hi GPW,

I will certainly leave an update once I have made some more progress. I have the van booked in for sometime next week, so hopefully will make some progress.
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brierly89
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PostSubject: Re: SOLUTIONS to 1KZ-TE Overheating?   Fri Mar 10, 2017 3:08 am

Hi guys,

Turns out the fan on my second radiator (the electric fan) was not working! Geez... No wonder it was having issues.

Anyone know where I can get a replacement or a good alternative? Hoping to get this fixed asap so we can get away on a camping trip late next week. Might have to retro-fit a generic one.
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brierly89
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PostSubject: Re: SOLUTIONS to 1KZ-TE Overheating?   Fri Mar 10, 2017 3:12 am

Can't believe I missed the electric fan... I had thought I'd seen it working, but it definitely isn't anymore...
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Hiace4wd
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PostSubject: Re: SOLUTIONS to 1KZ-TE Overheating?   Fri Mar 10, 2017 9:41 am

Check if it is really the fan, or if it is not the wiring.
I would guess that it is activated by either a thermoswitch or activated by the AC?
If activated by AC you should check if it is receiving any power.

If activated by a thermoswitch, you should pull the plug on the thermoswitch, because typically the fan will then run (failsafe mode I have seen on other Toyota's)

Perhaps you can put some electric fan on there which has the same size? Ebay is full of electric fans in a lot of sizes. Or perhaps something from local car shop or even junkyard if you are in a hurry.
Next to that, there are companies that can rebuild any electric motor, so also your fan.
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GPW
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Model and year : Model: KD-KZH100G-MRPGT
Year: 1996
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Registration date : 2016-07-16

PostSubject: Re: SOLUTIONS to 1KZ-TE Overheating?   Fri Mar 10, 2017 9:44 am

Good that you found it!

First I'd take it off and have a good look, test it with a multimeter.
It may simply have seized bearings and need some WD40 and a good jiggle.
Then test it with a 12V battery - minding your fingers.

First however try to turn it with your fingers (ignition off, engine cold!) and if it is free to turn, check the fuses..


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CustardCrazy
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Model and year : 1996 8 seater Super Custom 4WD KZH106
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PostSubject: Re: SOLUTIONS to 1KZ-TE Overheating?   Tue Mar 21, 2017 5:15 am

In case it will reassure you I use mine to tow a 1500kg caravan and the van itself weighs 3000kg loaded with people and gear. So far on plenty of 40deg plus days no problem!
I'm sure with everything fixed it will be fine. I guess you will have checked to see that if yours has a manually operated radiator blind fitted it is in the open position - mine doesn't have one fitted.
Cheers,
Dave
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CustardCrazy
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PostSubject: Re: SOLUTIONS to 1KZ-TE Overheating?   Tue Mar 21, 2017 5:23 am

Like all Toyota's I know of the thermostat is centre damped - this means that within a fair temperature range it will read normal and the needle will stay still. If the needle does get high you are right to be alarmed.

I forgot to mention that the 3.0 TD is still only 95kW. When you say "up to speed on any long hills" just be happy you can overtake me and my van as you go. (see my icon).

Cheers,
Dave
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