411 (1969/1970) cooling fans

[john smith]

Thanks Creg
Yes, it is cooling the radiator.
When standing beside the car with both fans running (engine off), there is
an awful lot of hot air moving out of the engine bay.
This is a good sign that the fans are doing more than just cooling the
radiator.
If the fans are switched 'off' immediately the engine is shutdown then there
must be a large amount of residual hot air building up with no place to go.
It would certainly melt any snow accumulation on the bonnet!!!!

[lansdownplace]

I find the heat normally rises for a little while after the engine is turned off.

[Rubbond]

Peter is quite right - the fans should run on until everything has cooled
down sufficiently - with the ignition switched off - unless you want to sit
in the car for another10 minutes.
Rgds,
Andrew.

[Des]

This could be a relay at fault, power to fans via ignition controlled
relay, relay contacts have stuck together so now fans are powered always, not a
bad thing really, engine will get some heat soak preventing cooling once
stationary as cooling system will still have some thermo syphon effect,
this, and the nice blast of fresh air can only help prevent vapour lock
possibility. Disadvantages I can think of would be a flat battery if the fan
switch sticks on, or, in the event of an engine fire, could fan the flames.

[Rubbond]

Hi Greg,
Don't forget the water pump doesn't turn when the ignition is switched off!
You could end up with a big pool of coolant on the garage floor!
Rgds,
Andrew.