3.1 Td bighorn intermittant overheat

[Renier]

I have a 3.1 td bighorn it has a very intermittant over heat issue general on a uphill but not always can be on a flat also doesn't use water any ideas?

[geeves]

Standard overheating issues
blocked radiator Take the radiator out and flush the inside both ways with a good pressure hose. Also check the fins are not caked in mud
Fan the viscous units fail but can be rebuilt using a fan oil from BNT It takes a full day to drain the old oil out.
Timing out This is one for the experts to check
jammed thermostat
Bad injectors
bad turbo
blocked exhaust
My bighorn used to overheat slightly even after checking all of this Turned out the previous owner had fitted a single core radiator which was half caked in mud. Fitted a 2 core and instantly found my thermostat was jammed open so it never even got warm unless climbing a hill Now the temp never moves

[Renier]

Thanks for the reply I'll start with tge radiator since I've been mudding but the problem started well before that I've done a tgermostat so maby ill be checking the fan next fan next turbo seems fine spools to 12psi at 2500rpm not sure what normal spool rate is but seems fine

[geeves]

turbo sounds fine

[fujitsubo]

If it's auto,check fluid/fit trans cooler, makes a big difference to engine temp on long hills if radiator doesn't have to work so hard cooling the trans oil as well.
I also found good secondhand factory rads are far more efficient than most of the new copied radiators from the likes of trademe etc.

[tonkamu]

Do they copy brass rads? The alloy replacements are better cooling than the brass one's I reckon, Only 250 bucks for a new alloy rad.

[geeves]

Brass radiators are only available second hand unless you have very deep pockets. If in good condition they do cool better but not by enough to notice. The big advantage is that you can repair them on the side of the track. In saying that though most brass radiators Ive seen lately have had the fins corroded away so are next to useless. With alloy radiators its normally the plastic tanks that give up often catastrophically. You can get alloy tank radiators but they are nearly as expensive as the brass ones

[Renier]

It's an auto I have been checking the auto fluid it's red and at a good level will be getting a cooler for that but was just holding off cos I would of thought it can cope with the rad cooler the previous owner has had the rad done with a what looks like 2 core rad from petone radiators would of though they would know what to fit it was prety blocked with mud but again it started before I took it for a mud bath

[geeves]

How easy is it to turn the fan? Try hot and cold

[Renier]

When it's cold it's easy enough when warm it's easy azzz just checked that after fitting the rad I checked it while the engine was not running correct me if I'm wrong but that fan shuld be hard to turn when it's warm?