OVERHEATING 406 1.9TD WITH Air Con.

Gents
I have noticed that my temp gauge that use to run at just below 80 all the
time now registers between 80 and just over 90 when the engine is working
hard i.e. going up hills.
I wondered if the airflow could be a problem so took a look at the fans. The
temp quickly restores to below 80 after the fan has been working for a few
minutes.The passenger fan seems to work when the engine temp goes over 85
but not the drivers side one does not seem to come on.
I have 2 questions
1) Where are the fan relays located ?
2) What is the sequence of operation for these two fans as I can find no
switches on the radiator to switch them on and I suspect they may be
controlled from the engine ECU
Mike

 

The above behaviour sounds normal, especially when you have multiple fans.
It'll run one or two, perhaps at different speeds, when it needs to. It's
also perfectly normal for the engine to warm up when you're working it
harder - but it's not overheating unless the coolant temperature extends
into the red (which will be at least 100°C, probably more).

More than likely, they're controlled by the ECU. I don't know the sequence
for the 406, but does a fan run with the air conditioning switched on? On
every air conditioning car I've encountered, it's normal for the fan to be
running when you use the air conditioner, since the condenser needs to be
kept cool.

 

DERVMAN
The climate control is switched to AUTO all the time and this uses the
aircon when required to maintain the temperature at 22 deg C. The fan
however only comes on when the engine temperature rises.
I guess the operation is probably normal I am just curious about the fans
working points and where the relays are located . I have had the car 4 years
but only recently noticed the rise in engine temperature to 90 deg C.
Mike