Outer Limits 4x4 Board

HI
i have 4.2 deisel with aftermarket turbo, it has been running fine but today it started overheating when travelling at aropund 100KM/h when i travel at around 60KM/h the temp comes down, slowly then remains at a normal level untill i reach higher speed then it climbs very fast. i have filled up the radiator and bled the system and the thermostat appears to be working properly. the fan is working fine.

Any ideas would be appreciated
Dylan

have you ever removed the radiator and cleaned the fins out? Hosing them out with radiator still in car only gets about 1/3rd of it cleaned.

have you made any changes to system at all?
new themostat would be a start, how old are hoses?
have you ever had radiator block checked internally?
waterpump working ok?


theres a few things to go on, but plenty of threads on overheating in here...

I have had similar problems sounds like you have a blockage somewhere. Start wiith the cheap fix and then go from there. I would take you radiator out and give the fins and the inside a good clean as well and see if that works. Failinf that check your hoses, claps, viscouse hub etc, it sounds like a pretty simple fix.

check if the bottom hose is soft . they suck in and restrict flow the faster you go . simple squeeze will tell if it feels real soft .

look for a hose with a spring in them , this is to stop it sucking in

bilby wrote:check if the bottom hose is soft . they suck in and restrict flow the faster you go . simple squeeze will tell if it feels real soft .

look for a hose with a spring in them , this is to stop it sucking in

You are on the money, I just replaced my bottom hose, it was as soft as buggery and expanding like a balloon under pressure, patrol was running up at 3/4 on a warm day. Put the new hose on and problem solved!.

Viscous couplings, are often an issue.
As is using a genuine Nissan Diesel Thermostat which opens at a lower temp than the aftermarket and other versions.

Hope you solve it. I bought a lemon with an overheating problem, and total cost has been around $20K by the time I semi-fixed mine (still gets to 75% if towing or long hill climbs.

When you guys are saying check it is soft, what is soft. I just checked my radiator hoses, and I could basically squeeze them till both sides touched. But the hoes don't feel like they are old and cracking etc......should they basically not be able to be squeezd in at all or just a little bit? I guess its hard to describe soft.

tritontray wrote:When you guys are saying check it is soft, what is soft. I just checked my radiator hoses, and I could basically squeeze them till both sides touched. But the hoes don't feel like they are old and cracking etc......should they basically not be able to be squeezd in at all or just a little bit? I guess its hard to describe soft.

if u can squeeze the pipes and make them touch with minimal effort its to soft you'll start having issues

This goes for me as well, as I would say according to my dash gauge my car runs hot sometimes, but what exactly does that gauge represent? Is the gauge incrimental as in is the gauge showing the car running at 50% of the max temp when it is half way, or is it showing half way (so the punter is happy when he/she looks at it), but really that half way represents 75% of the max temp. Does that make any sense.

The reason I ask this is that unless you know what the gauge represents, how do you know what you need to be attcking to fix the cooling problem that you might not even have but the gauge says you might.

Hoonz wrote:

tritontray wrote:When you guys are saying check it is soft, what is soft. I just checked my radiator hoses, and I could basically squeeze them till both sides touched. But the hoes don't feel like they are old and cracking etc......should they basically not be able to be squeezd in at all or just a little bit? I guess its hard to describe soft.

if u can squeeze the pipes and make them touch with minimal effort its to soft you'll start having issues

As Hoony says, they will cause issues.. change them both and keep the old for spares...

where do you get the pipes with the spring in them? nissan or bursons?

supercrap have them
autobarn
repco
any of the above
any radiator shop should have them

thanks hoonz