Overheating

[more speed]

2.1 MV Van works fine with normal driving but overheats when ticking over for a while.
The radiator fan kicks in when the temp dial reaches the led in the middle only happens when stood in traffic and then cuts in and out every few mins, until we get going again.

Any ideas on the process to follow to identify the problem.
The van is a syncro if that makes any difference.

[bigherb]

That is what it is supposed to do.

[a1winchester]

WHS^^^
Absolutely normal behaviour.

[marlinowner]

Just to clarify for the op, the radiator fan is switched on and off by a thermal switch on the radiator, the temperature gauge is connected to a temperature sender on the thermostat housing, ie. the gauge and radiator fan operate independently of each other.

[kevtherev]

2.1 MV Van works fine with normal driving but overheats when ticking over for a while.
The radiator fan kicks in when the temp dial reaches the led in the middle only happens when stood in traffic and then cuts in and out every few mins, until we get going again.

Any ideas on the process to follow to identify the problem.
The van is a syncro if that makes any difference.

A lot of people would kill for a properly working cooling system like that

[more speed]

My 1.9dg 2wd van never did this it very rarely came on, just seemed odd that this one has always done it.

[bigherb]

It has got another 200cc of bang to cool down.