Landcruiser 70 wont warm up

[jakwoo39]

ever since iv had my bj74 with a 13bt it will only reach normal operating temp (on factory guage) when im driving at 100km/h for atleast 20 mins on a warm day only.

has new radiator and hoses, i pulled out the thermostat in the weekend and tested it on the stove and it opens at 103 degrees celsius

it has new coolant and took about 12 liters, does anybody else have this issue as it allways runs cold when im thrashing it in the mud

[Jerry]

faulty guage ir earth on guage?

[Overkill]

faulty guage ir earth on guage?

Or a faulty sender.....

[mudlva]

faulty guage ir earth on guage?

Or a faulty sender.....

or you are just not TRASHING IT no where near hard enough

no seriously after you have been nailing it hard stop and pop the bonnet fell the radiator hose and the head of the tank if they are to hot to touch then the gauge or sending system is faulty

you said the thermo is opening at 103 that sound way to hot should be around 85/90 at a guess they are cheap enough put a new one in anyway. with thermo out did you flush the block with a hose put it in the bottom and running fast , you may need to start the motor to get the water past the pump ( dont get the hose caught with the fan, not nice ) the water should pour out the top hopefully flushing any scale etc with it

once all done head back out for another good beating

[jakwoo39]

ok it is definatly not the gauge as i have an aftermarket guage aswell and the aftermarket one reads about 100-120 degrees farenheight

and after a trip from dunedin to queenstown i popped the bonnet and i could easily hold my hand on the top hose.

and the only reason i know the thermo opens at 103 is because it says on the thermo and regular boiling water in a cup from the jug isnt hot enough i had to put it on my stove to get it open

[Overkill]

The thermostat could still be faulty, I'd be putting in new thermostat and then go for a drive......

[jakwoo39]

I will be going to get new thermostat anyway just because its in bits, but why do u think its broken because it opened when it was suposed to and closed when i cooled it

[Moriarty]

Water boils at 100 C at ATMOSPHERIC PRESSURE, put it in a pressure system and the boiling temp is increased.

Have you tried turning the heater off? or ON? does THAT make a difference?

Its odd that you are over cooling, easier to correct UNDER cooling....lol

check if the thermo being put in the right way up?

[SMOKEY]

Bet ya 9p to a knob of goat shit it's ya Thermostat , Do this test, from cold, slide a piece of cardboard down the front of the radiator to block of any draw through the core, start the motor and wind up the fast idle now keep all clothing and body parts away from the FAN and all moving parts , place your hand around the top hose you should have no heat in the hose until the thermostat opens, that will take 5---8 minutes and then it should be almost instant heat . I would almost have as a guess that your heater is almost non existent this is another finger pointing at the thermostat. There is only one thing worse than Overheating and that is

NOT HOT ENOUGH,

FITZY.
PS; as uncle Bob wisely said every 1lb pressure lifts the boiling point by 3deg; .

[jakwoo39]

ok just to throw a spanner in the works

the heater works but not very well if i had to rate it to a new car its about 3/10

and i have been round a few distributors today and nobody has heard of a thermostat opening over 100 degrees and nor can they supply one, so i went to cookies toyota and the original ones open between 80 and 100degrees so i have ordered one of those and itl be here on wednesday
cookies was also alot cheaper than others which is strange for genuine parts

[jakwoo39]

Water boils at 100 C at ATMOSPHERIC PRESSURE, put it in a pressure system and the boiling temp is increased.

Have you tried turning the heater off? or ON? does THAT make a difference?

Its odd that you are over cooling, easier to correct UNDER cooling....lol

check if the thermo being put in the right way up?

heater makes no difference to temp and i think it was in the right way can you try and describe which way it needs to Be?

[SMOKEY]

The longer side or the side with the return spring and wax canister faces the head, block/ housing the shorter side faces the top hose/housing, and is some times marked thus. It is not unusual for genuine parts from the dealer to be cheaper especially on older (out of date) models. I still say that with the new thermostat your heater will work 10/10 and the engine temp will sit just under 1/2 way .

FOLLOWING OUTCOME,

FITZY.

[mud_slinger]

if it sits vertical make sure the air bubble hole sits at the top otherwise you wont get rid of air bubbles

[jakwoo39]

well since toyota is the only place that have one that is the same dimensions as my one ill have to get it from them

so ill assume that the water pumps up through the engine then into the top of the radiator?

and it was the right was up according to smokeys discription and my new ones here on thursday so ill be back with an update then

[mud_slinger]

on the outside flange there is normally a small hole with a bit of metal thru it its a air bubble release hole and if ya thermo sits vertical not horizontal the air cant get past the thermo and you develop air locks which can cook ya engine

[jakwoo39]

allright got the new thermo in today
filled up coolant then started the motor

then turned the fast idle up and the motor actually warmed up, although it was very slow about 24 mins before thermo opened

but i have another question should my aftermarket water temp gauge read off the top radiator hose or the bottom?

mine is currently on the bottom so when the thermo opened it showed a dramatic drop in temp where as the factory one on the top hose barely moved

[sibainmud]

Top is best.
Cold in at the bottom and hot out at the top
Best place for sensor is near the factory one.
Cheers,

[mercutio]

most temp guages take a reading off the head somewhere seems strange to me to have one off the radiator hose

[Overkill]

Top is best.
Cold in at the bottom and hot out at the top
Best place for sensor is near the factory one.
Cheers,

+1

Glad to hear it is starting to get warm

[NJV6]

then turned the fast idle up and the motor actually warmed up, although it was very slow about 24 mins before thermo opened

A diesel takes forever to warm up with no load on it as they are very efficient at idle. Get in it and drive it then experience a nice heater.

[jakwoo39]

Wont be driving it for a while yet have decided to to a spring over axle conversion over the next few weeks so itl be needing cert

then turned the fast idle up and the motor actually warmed up, although it was very slow about 24 mins before thermo opened

A diesel takes forever to warm up with no load on it as they are very efficient at idle. Get in it and drive it then experience a nice heater.

[Big]

Just to add another spanner in the mix, make sure the water pump is mint..! as this is what pushs the water aro0und the system..
Great water pump + new thermo = pressure and temp sitting spot on..
Another thing too is flush the shyt out of the heater pipes etc.. if it's had not much glycol in it then it will have "rusty"water which in turn sticks to the sides of essentially everything slowly blocking the flow.. a good flush works well too..

Cheers

[jakwoo39]

Just to add another spanner in the mix, make sure the water pump is mint..! as this is what pushs the water aro0und the system..
Great water pump + new thermo = pressure and temp sitting spot on..
Another thing too is flush the shyt out of the heater pipes etc.. if it's had not much glycol in it then it will have "rusty"water which in turn sticks to the sides of essentially everything slowly blocking the flow.. a good flush works well too..

Cheers

truck had new coolant just before christmas so it should be pretty good

[Big]

Sorry to say but cooland won't mean jackshyt if it's not being pushed around the system.. it'll only stop the rusting of internal components and make for a higher boiling point..
old water pump = water going around slowly..
New water pump = water going around efficiently and most likely faster.. think of it like a blocked hose pipe and a new one.. same thing.. new hose pipe will be better..
Also new thermo will help along with water pump..

Cheers