12ht coolant temp (1 Viewer)

[Silveredition]

Gday all,
I hope this is in the best section..
I have added a Redarc coolant temp gauge to my hj61 - the probe is in the top radiator hose about 100mm from the thermostat.
From memory the thermostat (genuine Toyota) is stamped 88 degrees celsius.
In normal driving on say a 20 degree Celsius day the temp sits on 86 - 89 depending on the driving / hills / wind / lost etc.
I am currently on holidays in 38 degree Celsius heat, towing my boat (about 1 tonne) with the roofrack loaded, and the temp has got up to 95 (where I have my alarm set - for no real reason apart from it sounded like a good number...)
So, my questions are - What temperature is it okay for the coolant to get up to, and to sustain for long periods??

At what temp should I set the alarm for?

Thanks heaps!

Drew

 

[serenity]

I've seen my 1hz roll over the 100 degree mark while towing up hills. Probably not good for it though. It's had overheating issues for a while now though that I haven't been able to pinpoint.

 

[David*BJ70]

My 12HT usualy run at 88°C - 90°C (190°F - 195°F). Rarely up to 93°C (200°F)...

Here on MUD, I have already seen temperature readings for diesel engines that I can not reach with my own vehicle, I mean, I would not allow my engine to reach these temperatures. Indeed, some say up to 116°C (240°F) !

If I had a coolant alarm, I'll set it at 95°C (205°F) as a base line to raise my foot ...

 

[Vossie]

highest ive ever seen my 12HT was about 95 deg C. was off roading in low range and ambient temps were about 28 deg C, for about an hour and a half. normally driving around town she sits around 75-80

 

[Silveredition]

Thanks for all the replies! At 2:30 this morning we arrived home from the 1400km drive...
The first few hundred k's were in about 33degree heat, but with a strong headwind, and I kept the speed to about 85 - 90 km/hr to keep the coolant temp at 90 or below.... the further south I drove
, the cooler it got, and with temps in the high teens I could sit on 100 with about 88degrees Celsius coolant temp... but there were a few kangaroos around as it was night, so I could only do about 90 anyway....
I am very keen to hear other coolant temps - especially those with gTurbo's....

 

[Oldtoy74]

Thanks for all the replies! At 2:30 this morning we arrived home from the 1400km drive...
The first few hundred k's were in about 33degree heat, but with a strong headwind, and I kept the speed to about 85 - 90 km/hr to keep the coolant temp at 90 or below.... the further south I drove
, the cooler it got, and with temps in the high teens I could sit on 100 with about 88degrees Celsius coolant temp... but there were a few kangaroos around as it was night, so I could only do about 90 anyway....
I am very keen to hear other coolant temps - especially those with gTurbo's....

Did you notice slight power loss with those high temps, I've done some touring Hj61 with camper (1ton) middle of summer in NSW, 33-38deg C, my temps gauge normally would sit just under 1st line in gauge, towing or not, Once it tips past 32d I se my gauge rise, to max of half way 37d c, I have found a laser temp gun from my hoarding days., under normal conditions my thermostat housing sits around 74+ d C, Have not tested with full summer loading yet

 

[Mike Tyrrel]

I see that this thread ended a while ago, I have one question for all. Do any of y’all have any type of intercooler set up’s?
MT