Problem With My 2.0L 16V Mk2 Mondeo Estate

[carl23]

Hi I am in need of advise with my car. I have owned it for about 3 months now and noticed that if I am stuck in traffic the temperature gauge goes right up to the A or L on normal before the fans cut it. Also if I have the heater on cold the temperature gauge goes up while driving, How ever if I have the heater on hot then while driving it will go down to almost cold. I have tried to see if it is a airlock (after looking on the forum). I'm now out of ideas.

The car has done over 144000 miles (still runs as sweet as it should).

Thanks in advance for the help. :D

[wase16ll]

does the heater actually work the way it should?

if so, may pay to flush the system and renew the stat to start with.

[FOCA]

Yes, sounds like the thermostat

[mick85]

Also check water pumping right an no blockages