GU 09 Overheating!

[Mitch88]

Hi guys,
I have a gu patrol 09.
Was wondering why it overheats when I am in 4l or4h when I'm in the sand or when the engine is being worked!
Takes about 1km on the sand and it overheats ,let it idle for 2 minutes and goes back down.
Doesn't do this when normal driving on highways or when I'm towing my boat only in 4l or4h.
Thanks Mitch.

[4bye4]

Sounds like airflow so, maybe your viscous clutch on the fan or even do you have a lot of stuff hanging on the front of the car which may obstruct airflow. are all the panel and shrouds under the car still there and intact? If its ok at speed when air is flowing over the car and through the radiator, I would be looking at the viscous clutch or a slipping belt first up.

[Mitch88]

I can hear a belt scretching when the motor is cold, yeh all panels and shrouds seem to be alright, I'll have a look at the other options.
Cheers mate legend 👍

[4bye4]

I can hear a belt scretching when the motor is cold, yeh all panels and shrouds seem to be alright, I'll have a look at the other options.
Cheers mate legend 👍
Just remember that the belt might be screeching because the tension pulley is not working properly. Check everything while your there, saves having to do it several times.

[happygu]

There was a few CRD Patrols of around that era that had partially blocked cores in the radiator ,from junk left in the block from manufacturing mixing with the coolant and coagulating .....

Your may be one of these too

[the evil twin]

Check the viscous fan clutch (probably around 90% of faults), if that is OK then it is time to consider pulling down the coolant system and getting it flushed, thermostat checked etc for blocked rad cores or such as suggested by others.

If the belt is squealing when cold either the tensioner is shagged or the belt is stretched.
Neither should cause overheating in itself but may contribute.
I would fix the tensioner and/or replace the belt (keep the old one as a spare)
Genuine belts seem teh best bet as a lot of non-gen ones often give issues

[JackCollo]

Sounds like a fan clutch to me. Have had a number of mates with the clutches go on the fan. It's hard to pin sometimes but yeah I'm gonna second the fan clutch. Good luck with it

[Mitch88]

Cheers for the feedback everyone , when I get home from working away I'll pin point the problem n let use no.
Cheers Mitch.

[JackCollo]

Good luck with it mate should be a pretty straight forward exercise

[bignev]

How do know it us over heating? Scan Guage/ultra Guage or the troll temp sensor . I have a ultra Guage and i find engine temps between 89 and 93 on raoad but up to 100 °C on soft sand. I have 2007 crd.

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[Mitch88]

Because the temp gauge was going to hot.
Fan clutch was ok but put a new one on anyway , took the radiator out and had it tested it was 60% blocked.
Fit new radiator and went down to the soft sand and tested and everything is fine now.

[JackCollo]

Good to hear everything is all good now Mitch hopefully doesn't give you any more trouble in the future