Exterior Temperature gauge

that is a strange one , i think the problem is with the exterior temp sender as the fan cutting in and temp gauge falling is what you'd expect ,try diconnecting the exterior temp gauge ,may be a fuse for it ,if that is all ok i'd get the ECU checked as may be getting a short let me know how it goes

Thermostat may not be working properly, hot coolant has to circulate via the heater core in order to get heat. Normally operation temperation should be 180 to 200 degrees.

The high side should read a little more than 100 pounds plus the ambient temperature. On a 100 degree day the high side will be over 200 pounds. A high side reading of 250 pounds is no problem. The important reading is the low side, and it should always be about 30 pounds. Higher than 30 will produce warmer air, and under 30 will cause the evaporator to freeze up.

YOU COULD HAVE BAD COOLANT TEMPERATURE SENSOR OR COOLANT TEMPERATURE SENDING UNIT.

180 degrees. Usually the middle.

You need to replace the external temp sensor located inside the front bumper area.

REPLACE THE TEMP SENSOR IN FRONT OF THE RADIATOR AND SEE IF THAT CORRECTS THE PROBLEM.

lift the carpet at o/s/f {drivers front footwell} there is two multiblock connecters guarenteed tobe sodden with water disconnect connectors& dry with a hair dryer on low setting hopefully the pins are not corroded reconnect connectors this is aknown fault i have worked with peugeot&citroen for 24 years kind regards alastair

Page 106 from the owner's manual. It says (if equipped), it's in the MESSAGE CENTER. Press the INFO button (you should see 3 buttons INFO, SETUP, RESET, pressing INFO will toggle the odometer display between a number of things like odometer, distance to empty, outside temperature, etc.

Good luck, if you still need help don't hesitate to stop by your local dealer and have them show you.

Had this same problem with my car, a 2001 S60 T5. It turned out to be the temperature sensors mounted beneath the exterior mirrors -- you'll see a nipple under each mirror (and you can pop it out with a screwdriver).

One of these external sensors (forgot which side) is used by the engine management system. The other one is used for the inside temp gauge.

I found that one of them (I think the one under the passenger sie mirror, but don't quote me) had popped out, leading to my weird temp readings on the dashboard gauge. So I just popped the sensor back into the bottom of the mirror, and that solved the problem. Check both mirrors, though. If the sensors seem fine, maybe pop them out and then back in...and see if that works.

If that doesn't solve your problem, then you might have to replace the appropriate temp sensor (or worst case, the entire exterior mirror). Good luck!