Thread: hot v8

Hi,

Your temps do sound high. In tropical high humidity conditions my V8 never went over 100c. The thermostat opened at 98 ant then the temp dropped quickly, 92c round town and 87 on the open road.
I never had an over heat issue but did change EVERY hose over a period of 6 months and clean out the rad. Apart from what you are doing, changing the expansion tank cap could help too.

Cheers Jerry

Originally Posted by Road Stone

Hi,

Your temps do sound high. In tropical high humidity conditions my V8 never went over 100c. The thermostat opened at 98 ant then the temp dropped quickly, 92c round town and 87 on the open road.
I never had an over heat issue but did change EVERY hose over a period of 6 months and clean out the rad. Apart from what you are doing, changing the expansion tank cap could help too.

Cheers Jerry

Thanks Jerry - Ill change that tank caps as well i think. See what happens over the weekend after a big cleanout. If its still high then i will pull out the radiator. Although, by the looks of it, the rad was replaced by the previous owner

you dont have two bloody great spotties bolted up in front of the rad, do you?

Originally Posted by CaptainJack

Yep, been thinking that too. New water pump and 82deg thermostat arrived today by express mail. Ready for a big saturday doing a full system flush, bypass of the throttle de-icer, new pump and thermo.

I drove the car today to work and back and logged the temps on my OBD Tool.

In traffic (the slow crawl on the mount lindsay at browns plains in brisbane) it got up to 101deg, but doing 80ks it was at 95deg, and at 100km on tjhe motorway it dropped to 90deg.

But as soon as i got off the motorway in thet city back in traffic it went straight back up to 107 deg

This is exactly how mine used to behave.

I even have a low temp thermostat.

Turned out the radiator was blocked & was actually cold in front of the fan.

This meant that the heat activated doodad in the hub of the fan was never actuated and the fan never locked up.

So at low speeds or in traffic there was no air being pulled through the radiator but as you moved off or on the highway temps would drop back to normal.

New radiator & all of my cooling issues disappeared.

Originally Posted by Pedro_The_Swift

you dont have two bloody great spotties bolted up in front of the rad, do you?

nope

Originally Posted by Cannon

This is exactly how mine used to behave.

I even have a low temp thermostat.

Turned out the radiator was blocked & was actually cold in front of the fan.

This meant that the heat activated doodad in the hub of the fan was never actuated and the fan never locked up.

So at low speeds or in traffic there was no air being pulled through the radiator but as you moved off or on the highway temps would drop back to normal.

New radiator & all of my cooling issues disappeared.

The rad was replaced 6 months ago by previous owner so i dont think its blocked, but if its still happening after i do everything else, i will rip it our and replace again.

well it seems i have a stuffed viscous fan. Thats why at highway speed its getting enough air to cool but overheating in slow traffic or at standstill.

I checked it a couple of days ago and it had some resistance when hot, but tonight after a 20 min dirve is was totally free - could stop it with a newspaper when running, so its simply not drawing through enough air on idle.

so got to see if i can source one somewhere in brisbane on sat morning without paying through the nose.

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