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Thermostat will open at 82deg and will stay open while you continue driving just like every other car the engine is designed to run at this temp and the temp should only increase when the engine is under load like going up steep hills or towing and should pose no problem with a well maintained system so fitting a temp guage in that top hose will at least tell you that the heat is building up in the engine which is better than the dash guage as at least if its heading higher than 110 or so deg you can pull in and let the system cool down.g8dhe wrote: Sun Jan 23, 2022 7:35 pm What do you expect the radiator temperature to tell you precisely ?
There is coolant flow thru other parts of the cooling circuit as well as the radiator which only comes in to play when the thermostat opens to allow cool coolant to add to the flow.
Hazzobongo wrote: Thu Jan 27, 2022 8:34 amThermostat will open at 82deg and will stay open while you continue driving just like every other car the engine is designed to run at this temp and the temp should only increase when the engine is under load like going up steep hills or towing and should pose no problem with a well maintained system so fitting a temp guage in that top hose will at least tell you that the heat is building up in the engine which is better than the dash guage as at least if its heading higher than 110 or so deg you can pull in and let the system cool down.g8dhe wrote: Sun Jan 23, 2022 7:35 pm What do you expect the radiator temperature to tell you precisely ?
There is coolant flow thru other parts of the cooling circuit as well as the radiator which only comes in to play when the thermostat opens to allow cool coolant to add to the flow.
I fitted one to my hilux surf after the head on that cracked after hauling a three ton loaded trailer so that I knew the real water temp rather than rely on a guage which only indicates when you're having a disaster.
On the surf the auto tranny cooling was what caused the problem as it passed through a lower chamber of the radiator to be cooled, it just wasn't sufficient or efficient enough and needed an oil cooler which I plumbed in following that disaster too and had no more issues, how is the auto trans on these cooled? H
If thats the case then I don't understand the need to empty and refill ATF through the dipstick, on the surf I put a hose from the ATF cooler intake pipe into a bucket and the return to the tranny into a five litre container of ATF (the one it comes in) then fired up the engine, it sucked the good stuff in and ejected the old into the bucket, once it started flowing red again switch off the engine and reconnect the pipes/hoses.teenmal wrote: Thu Jan 27, 2022 12:31 pmHazzobongo wrote: Thu Jan 27, 2022 8:34 amThermostat will open at 82deg and will stay open while you continue driving just like every other car the engine is designed to run at this temp and the temp should only increase when the engine is under load like going up steep hills or towing and should pose no problem with a well maintained system so fitting a temp guage in that top hose will at least tell you that the heat is building up in the engine which is better than the dash guage as at least if its heading higher than 110 or so deg you can pull in and let the system cool down.g8dhe wrote: Sun Jan 23, 2022 7:35 pm What do you expect the radiator temperature to tell you precisely ?
There is coolant flow thru other parts of the cooling circuit as well as the radiator which only comes in to play when the thermostat opens to allow cool coolant to add to the flow.
I fitted one to my hilux surf after the head on that cracked after hauling a three ton loaded trailer so that I knew the real water temp rather than rely on a guage which only indicates when you're having a disaster.
On the surf the auto tranny cooling was what caused the problem as it passed through a lower chamber of the radiator to be cooled, it just wasn't sufficient or efficient enough and needed an oil cooler which I plumbed in following that disaster too and had no more issues, how is the auto trans on these cooled? H
The cooler is built into the rad, there is a wee difference re thermostats , the wltd is fitted on the return side of the flow which means it is getting hit with cooled coolant and will tend to open and close more often than the normal stat position. It will be like a fiddlers elbow .
Cheers for that Geoff I got underneath the front today but couldn't see where they were, I need some ramps to get this thing up high enough to get my old fat aris in there.g8dhe wrote: Thu Jan 27, 2022 12:26 pm The ATF is cooled in a separate section of the radiator at the bottom, it has its own connections etc at the bottom.