Outer Limits 4x4 Board

So I've had some work done on my car and part of that they had to take out the radiator so I got them to clean all the crap out of the core that was blocking it and also replace the thermostat...

As far as I can see it seems to still be overheating, I'll have to take it for a drive on the freeway to check it out again.

It was suggested that it could be the fan viscous, how likely is that if it's overheating at freeway speeds... would it be more likely to be the water pump?

It was overheating on the sand dunes at low speeds but high revs and also on the freeway at high speeds so it should have had decent air flow... My thinking was that the fan viscous was much more of a low speed thing to cause the overheating?

Also where does the temp guage sit in your diesels during normal driving?

i had the same problem put in bigger rad but no different.Got some engine flushing oil and it made a big differents ,turdo diesel rev very high and are on full boost on the freeway .make sure you use good coolant not cheap stuff from woolies .mine runs 1/4 on normal driving nearly 1/2 way on freeway driving .

Jeez, mine has always run about 1/4 on normal driving...

I'm not sure what you mean by engine flushing oil... You don't mean the crap to clean out the water system do you?

What ratio do you mix your coolant? And also what year is your rocky just as a comparison?

Was it a genuine Daihatsu thermostat? If it wasn't then that most likely won't be helping - or may even be the cause.

Nah it's the genuine thermostat... Posting about the mechanics shonky work seperately now though.

mine runs 1/3 to half all the time highway driving around town or low range a old and experienced mechanic but i also live in cairns northern queensland aust so it is 30 + degrees up here for alot of the year....not cheap coolant but not all that expensive either...

On the subject of coolant - straight water is actually better at transferring heat. The more anti freeze that's mixed in the less heat transfer you'll get.

Redline also make a product called "Water Wetter" which you can use instead of normal anti freeze / corrosion inhibitors and it's supposed to cool better than straight water.

murcod wrote:On the subject of coolant - straight water is actually better at transferring heat. The more anti freeze that's mixed in the less heat transfer you'll get.

Redline also make a product called "Water Wetter" which you can use instead of normal anti freeze / corrosion inhibitors and it's supposed to cool better than straight water.

People look at you funny if you say "I'm not running coolant"... They say well how does it cool if you're not using coolant and just using water!

I also like it when people have issues with overheating and say they will run 100% coolant to fix it!
Coolant has a very ambiguous name and confuses a lot of people.

Water wetter contains corrosion inhibitors, but does not aid in changing the boiling/freezing points of the cooling liquid.

I've added water wetter in with my coolant since my car is back on the road, so I will report on how it goes.
I just went on the site and saw the 'Diesel' Water Wetter and now am thinking I should have used that... Would have had to be ordered in though, no-one stocked it.
The Diesel product doesn't contain the inhibitors, so you can still use your normal coolant with it, gaining the better heat transfer properties.

In theory, it can work, so time will tell.

i am using castrol radi-cool it is not an anti freeze cause i dont need that here and it is pre-diluted just poor it in to an empty radiator and system and away you go.....it has the anti corrosive agent in it too...i have had no probs with it at all...good luck

i am using castrol radi-cool it is not an anti freeze cause i dont need that here and it is pre-diluted just poor it in to an empty radiator and system and away you go.....it has the anti corrosive agent in it too...i have had no probs with it at all...good luck

boofed wrote:i am using castrol radi-cool it is not an anti freeze cause i dont need that here and it is pre-diluted just poor it in to an empty radiator and system and away you go.....it has the anti corrosive agent in it too...i have had no probs with it at all...good luck

I used this ages ago when i had my rocky, as it was just an corrosion inhibitor, and i had no need for anti-freeze. I had no problems with it.

Layto....

I use Toyota brand coolant in a 50/50 mix with distilled water. I have never had any problems but it is a bit pricey around $40 for 4 liters for the concentrate from Toyota but it has a good reputation for keeping everything corrosion free.

FROZY wrote:I use Toyota brand coolant in a 50/50 mix with distilled water. I have never had any problems but it is a bit pricey around $40 for 4 liters for the concentrate from Toyota but it has a good reputation for keeping everything corrosion free.

All decent coolants are around $40 for 4/5 litres. You get what you pay for.

FROZY wrote:I use Toyota brand coolant in a 50/50 mix with distilled water. I have never had any problems but it is a bit pricey around $40 for 4 liters for the concentrate from Toyota but it has a good reputation for keeping everything corrosion free.

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