Hi anyone have a solution to my problem of overheating on my 2003 voyager 2.5 CRD?
It over heats when I travel over 60 mph.
the fan kicks and does cool the engine when either at a stop or below 60 mph
there is no obvious leak as there is no coolant loss.
I've tested the water pump and that's ok, as is the thermostat.
I've flushed the system through and no blockages
the radiator has equal temperature readings throughout.
it has been tested for gases within the coolant and none has been found.
however the ECU reads a temperature of 215 degrees whilst the physical temperature reads 90 degrees?
It recently has had a new coolant temperature sensor fitted.
It definitely over heats as the when the gauge is in the red the hoses pressurise extremely hot and bubbling within the expansion tank, note this only happens in the red.
Please anyone got any suggestions?

 

I've had this myself. The ally-cored radiator gets plugged up if the HOAT antifreeze isn't changed on time, i.e. 5 years. It's likely the thermostat is jammed open too, as it is organized to do this if there is overheating. Ally-cored rads can't be flushed, the aluminium oxide is far too hard. Sorry but you'll be spending a few bob to fix this.

Leedsman.

 

- get a S/H rad
- fit an inline stat, see Leedsman's post here
- do it before it costs an engine

 

Thanks Leedsman, I took a chance and bought a radiator off ebay and replaced it along with air conditioning condenser unit as that had a leak in it and bingo both working a treat!! with the added bonus the thermostat didn't need replacing.
Cheers for the advice

 

We aim to please.

Leedsman.

 

You certainly did a lot of testing yourself and I could see where you were coming to a brick wall...This thing about Ally-cored radiators blocking, was a new thing to me too.

 

yes I did goggs ha ha! where I said there were no obvious leaks, but when I removed the radiator there was evidence of a leak and maybe a previous owner had used radweld or other variant to plug it but in doing so caused a blockage within the veins of the radiator due to the thinness of said veins?