overheating 2000 Disco Series II TD5

Jamie Telford · 25th September 2014, 11:08 PM

Hi all!

Sorry to make my first post about a problem I'm having with a 2000 Series II Discovery TD5, but here I am!

I've read around a bit in an attempt to research the problem. With the following thread giving a good check list.

However I'd like to run the problem by you guys for any extra info, especially on the TD5.

Basically the Disco is overheating very quickly now and appears to be boiling off/discharging water through the over flow.

The following is the chain of events

I drive about 100km and then the temp starts rising dramatically and finally peaks. The vehicle also loses power (electronically controlled??)
I immediately pull over and idle the engine, opening the bonnet and the check the levels.
The fan is running full tilt and the header tank level is almost empty and steam is blowing out from the cap.
After the engine has run for about 5 minutes the temp has stabilised and the fan switches off.
I'm able at the point to unscrew the header cap to top up..
I partially unscrew it (not take it off, just to release pressure)
at this point the cooling fluid rushes back into the header tank, I screw the lid down hard again.. and the header tank level drops to almost nothing again.
I repeat these steps a couple of times until at some point the coolant ceases to flow back in the header tank.
I'm then able to top up the fluids and drive off carefully again.

The car seems to be functioning perfectly apart from this..

any additional help/tips would be appreciated.

p.s. I'm on the road in Montenegro and need to do some kinda stop gap repair.

**sierrafery** · 26th September 2014, 12:07 AM

Hi, the simple things first(provided the radiator is not clogged), not necessarily in this order:
1. put a new tank cap and tighten it well after you refilled the system, it must keep constant 1.4 bar there otherwise it's problem but i dont know how to rule it out other way,
2. new thermostat would be good too to be ruled out as well
3. when the engine is at operating temp(gauge at the middle) try to stop the viscous fan with a rolled newspaper or something as to protect your hand... you must not be able to stop the fan easyly if it works well and locked on warm but if it's freewheeling it can't provide enough cooling effect
4. if you open the bleed screw with engine running and rev it a bit the coolant must squirt up quite hard if the pump is good...though usually when the pump fails it leaks bad

if no joy with these things take it to a coolant sniffer test to see if it's HG failure or not

Jamie Telford · 26th September 2014, 12:28 AM

Thanks for the quick reply sierrafery! cheers

Yeah ok.. I've had a look at the radiator and the RHS side of the radiator appears to be caked with a black dust or the such.. will be interesting to see if this has reduced the cooling ability of the radiator.

Will report back as I go through the check list..

Cheers

Jamie

Jamie Telford · 26th September 2014, 11:55 PM

The fan it seems is shot.. doesn't spin up when the engine revs.. and the radiator core is filthy

will update on if this is the fix

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