Good afternoon everyone
I don’t post much, more of a reader without any real knowledge.
I have a heating issue or maybe not. Just recently I have had the temp gauge rise to around the 2 o’clock position for around a 10 seconds or so, then it comes back down to 3 o’clock level. It does this whenever it feels like it, up hills on the flat. I drove it for two days without any issues, then I had it again today for the few seconds. If I’m on hills and it does I lose a bit of power too.
it’s a strange one. Anyone had a similar experience? Would love to have an idea where to start.

 

My first guess would be a thermostat sticking intermittently. I would treat this very seriously as overheating these engines can be very costly.

 

Get a cheap $25.00 blue tooth ODB dongle (amazon) and torque for phone and get your actual engine temps. It could be you are running in the high 220's and occasionally hitting 230ish which would account for the temp blip.

Also what year Disco - and 03/04 had a higher temp thermostat.

But as @Harvlr noted it is likely a thermostat issue but you need to know your actual running temps

 

I’m running a 2002 TD5 sorry, I completely forgot to mention the actual vehicle!
it was my first thought the thermostat, I wandered if there were other factors I initially.
I think I’ll book it in with the mechanic. Probably beyond me the thermostat change, although I will check out some tutorials on YouTube.
A friend of mine has a plug in tool, I’ll see if I can help me with the temperature log.
Thanks for you reply Harvir and Richard.
I’ll come back hopefully with an answer shortly.

 

It’s still probably a good idea to get another temp gauge, but our replies pertain mainly to V8’s.

 

I’ll look at organising that temp gauge.

I also just spoke with someone, who’s certainly more educated than I. He said that the viscous fan could cause intermittent rises in temperature if it is starting fail. I looked at it and it has a bit of play in it. I do have a slave vehicle on hand which has a good low kms engine in it. So I’ll try get the fan off and swap it out. I’ll need help with that, so when I get that part done I’ll report back.

 

@bookers123 TD5 is a totally different beast than the V8, and all our suggestions are pretty worthless as a result, other than Thermostat and Fan clutch. It is unusual for the diesels to overheat so you want that looked at sooner rather than later. Get a copy of the RAVE that covers the Td5 as well as the V8, it can help with diagnosis.

 

Over the weekend I dropped a **** ton of coolant when I pulled up at my local supermarket. Which obviously prompted a more urgent fix, and …..
Well it was none of the above!
Ive yet to have a prolonged conversation with my tech, but a layman explanation is, a hose had split which obviously enlarged over time and the radiator plug blew out too. It kind of explains the growing issue over time.
I didn’t exchange the viscous fan in the end either. If someone requires further information for their own issues let me know and I will seek out the full mechanical explanation.
And thanks for all who added input.

 

I'd check your hoses to see if they are extremely hard, when this issue happens. TD5 are known for head gasket issues...and without knowing mileage on vehicle...just my best guess.

 

First thing I would do is get an ultragauge for 80 bucks off their website. UltraGauge OBDII Scan tool & Information Center
That way you can see the temperature at all times and not have to worry about the unreliable stock gauge.