300 tdi engine temps

**460cixy** · 14th January 2016, 11:32 AM

Having a few temp issues with the disco on these last couple of days its been 38/39c here and the old disco is not loveing life radiator was rodded out about 4 months ago in preparation for summer new fan hub and all the bugs blown out of the a/c condenser and trans cooler thermo fans all checked and functioning.

If the ambient temp is not over about 35 it will run at around 80-85c but if worked hard climb up to 88-90c for short periods then back down to normal with the a/c on so as a precaution I fitted a 80c thermostat in the hope it might help it run around the 80c mark

In this hotter weather it slowly climbs to 90c+ just at cruise with the a/c on turn the a/c off and it really struggles to drop the temp back down its like there's just no reserve capacity in the cooling system at all. Actually its hopless to be honest

The spot lights will come off this arvo not that there huge and was thinking of removeing the grill temporarily to see if it improves things any other ideas?

**jboot51** · 14th January 2016, 11:43 AM

Mine sits on 95 with a max of 99 on the hwy.
Around the back streets it will be 92.
The viscous fan locks up noticeably at 95.
Vdo temp gauge is installed

**jboot51** · 14th January 2016, 11:44 AM

And that is with ac on or off.
Also ambiant temps make little difference.

**460cixy** · 14th January 2016, 11:50 AM

Wow ok that's pretty bloody hot seing the standard thermostat is 88c I recon its too close to the limit for comfort the defender got recored last year and runs much cooler but has not got all the other junk infront of the radiator

**jboot51** · 14th January 2016, 11:58 AM

(In our group) There are 3 of us that kick around in 300 tdi defenders and all the temps are similar.
All 3 are running the plastic/ali rads.

**460cixy** · 14th January 2016, 12:00 PM

Mine are both original copper just ones got a new core

**Judo** · 14th January 2016, 12:03 PM

I get coolant temp over a 100 very regularly in summer. Head temp up to and a fraction over 100 sometimes. (My record is 101 or 102, can't remember). I find coolant can be up to 5 degrees warmer than head sensor when driving hard. Top end of the scale is head temp 100 and coolant at 105.

How do I do it? Slightly over-sized tyres, roof rack, bull bar, winch, fridge, passenger and AC on. Piece of cake.

I really want to try the "tropical mod", but it's just not on the priority list...

**460cixy** · 14th January 2016, 12:14 PM

Tropical mod? Is that blocking off the 5/8 hole in the divider mines been done

**Brett1066** · 14th January 2016, 12:29 PM

I don't normally get above 90 deg, coolant is always a little lower than the head temp, even last week when it was 43 degrees here. Haven't done a long drive for a while, but around town and stuck in traffic on hot days my temp won't go above 90.
Mind you, I pulled out the air con condenser recently (seeing as I had previously removed the air con unit from the cab as it hadn't worked in years) when I fitted a new viscous fan, and am getting much better airflow over my radiator than I was previously. Even then though, never saw the temp get above about 92-93.
Assuming you have checked all the obvious things - air lock, blocked hose(s), water pump working properly etc...

**460cixy** · 14th January 2016, 12:36 PM

Yeah every things tip top even a new copper heater core to replace the old leaky one only thing I can't be sure of is the state of the water pump impeller but you give it a rev with the cap off and there's plenty of flow through the bleed hoses so I'm confident its ok. Just brought a set of ford el/ef falcon fans off a bloke wrecking one up the street but seriously at 100 kph you would think there would be plenty enough air flow not to need to resort to stuff like that

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