A year or ago my 1995 Defender TDI300 started intermitently running hot. There didn't seem to be a pattern to the behaviour although it was almost guaranteed to occur when I undertook a 15 minute steep climb ( I live in the mountains ). However the ambient temperature seemed irrelevant. It also seemed to happen frequently when I entered lengthy tunnels. The temperature gauge would move so swiftly you could actualy see it move. Most of the time it stops just below the red, but very occasionally it does enter the red but goes no further.
In my attempts to rectify the problem I have :
1> Replaced the sender unit.
2> Replaced the radiator.
3> Replaced the viscous coupling unit on the fan.
Although the problem seems slightly less frequent it is definitely not fixed.
Last night I noticed something really strange - the temp needle actually seems to rise visibly the instant I switch on the headlights ( which explains the swift appearance of overheating in tunnels ).
Can anyone explain a link between my temp gauge and the headlights ?????
Cheers for your thoughts.
Dave
In my attempts to rectify the problem I have :
1> Replaced the sender unit.
2> Replaced the radiator.
3> Replaced the viscous coupling unit on the fan.
Although the problem seems slightly less frequent it is definitely not fixed.
Last night I noticed something really strange - the temp needle actually seems to rise visibly the instant I switch on the headlights ( which explains the swift appearance of overheating in tunnels ).
Can anyone explain a link between my temp gauge and the headlights ?????
Cheers for your thoughts.
Dave