105 Cruiser - slight over heating when towing CT (HELP)

I take it is a 1HZ, could be the fan clutch needs more silicone fluid.
But I would expect that it would run hot pushing it in those ambient temps.
It would be really interesting to know the EGT's under those conditions too.

JAke,
Its hard to reply with what u gave us..
How many K's does it have ?
have u owned it from new?
Have you been through mud on your trip enought to dry itself in your radiator..etc etc.
But having 1.2 in tow will always add stress to a vehicle on hot days.

Personally I would be checking everything to do with cooling system.

So many causes for this mate, depending on K's its done. Possible causes could be...
Radiator needs a professional clean out,
Engine may need same,
Water pump,
fan,
Hoses could be soft,
Your air condenser may be full of bugs thus restricting air flow to ur radiator,
OR ur radiator may be full of bugs.

To clean it out properly, it needs to be removed from vehicle.

As for the air con squeeling on start up..thats telling you it needs to be
re-tensioned or replaced

Dont forget mate, these things can run over 3/4 on gauge, I know it looks frightening but they can run there. You just have to make sure it dont climb its way into the red.
My GQ used to run hot as hell under load..really bleep me off so i did some tests and some mods to it (mostly simple time consuming stuff and now she runs great.)

Hope i have helped u with some ideas mate
Ange

Jake
Was the cruiser due, or over due, for an oil change at that stage? If so, it could be due to oil thickening and sludging. It's not always easy to replicate the same situation, and it may not over heat under more normal conditions.

If you find nothing wrong with the cooling system, check the oil. If it stains your fingers (from the dipstick), and doesn't wipe off clean, some sludging will be present, as there's no detergent left in the oil. It is a pretty common cause of overheating in small diesels.

Best of luck!

Hi Jake,
When my 80 series was over-heating while towing heavy camper up hills, I got some excellent advice on this forum. The first thing I would check would be the bugs/mud in radiator, & if all that looks good go straight to the fan clutch. An easy way to chech it (as it was explained to me on this forum), is to put the vehicle under load i.e strap on the camper & go & find some hills on a warm day, & when the needle kreeps up higher then it should be, hop out & have a look under the hood with the wife at the controls. Whilst watching the fan get the missus to shut the car down, the fan should stop when the engine does. If it overspins then it is the cause of your problems & it needs some fluid. Easy job to fix.

Good Luck, OM&M.

110kph up hill at 40 degrees, air cond on and towing a substantial trailer, with all of your camping gear....... you may not have a problem Smitty.......that's working hard and thats very hot.......if this never happens in cooler weather its more than likely a completely normal situation. The usual checks as mentioned above would be my move, plus casual monitoring in the future.

A 1hz diesel with 1.2 ton on shouldn't over heat in 50 degree temps.
I would take a serious look at your exhaust gas temperatures.
If these engines aren't set correctly it will destroy itself even without the extra load of towing. I would get it checked ASAP or better still install a EGT guage. They are money well spent.
No hotter than 500 degrees if it is installed directly after the turbo.
Trust me I install turbos and set them up with these guages. It doesn't take much to have these over heat.

Cheers
120scruiser

Toyota sell the fan fluid.....i would start there....to prove it on a mates 1hz cruiserwith exactly thesame scenario, we fitted an electric fan in front....the temp went straight down when it was switched on...so new fluid went in and no more problems were had....and the fan got connected to the air conditioning system, because that was colder with fan on too.
Andrew

Hi Jake,

It sounds like you have had plenty of good advice from the forum members.
It is all relevant to your question,
However, I coundn't help but notice that no-one told you to check \ replace your thermostat.

A Faulty thermostat may not fully open, or may be stuck partially open.
Not a problem most days, but on a really hot day may cause a slight overheat condition.

Best Regards
David

I have the same as you - 105 TD & Kimberley in some very hot places and NEVER had a heating problem - A friend with 80 series had overheating problems - removed his spot lights and has not had a problem since.

Hi Smitty,
Had exactley the same issues with exactley the same set up. 1HZ with a DTS. Cruising accross the hay plain on a 42 degree day with the camper trailer. Get the clutch fan checked for a start (not cheap to replace). I would also suggest a dyno tune from a good diesel shop and checking of exhaust gas temps. That fixed mine. The DTS is a water cooled turbo so it cranks up the temp a bit.

Mick

try cleaning the bugs out of the aircon condenser

THANKS to all for your replies!! Will have a close look at everthing mentioned and will have it professionally checked next service!