156 TI 1.9 jtdm temperature doing yoyo
my engine's temperature is weird, i explain.
when driving the temp can jump from 90° to 100° in some second, then can go down to 90 again in seconds too.
when i stay stoped and at idle, temp is above 90° at the dash indicator, the odb tools give me 94°. the fan start to turn, but the temps don"t drop a lot, not enought to make the fan stop, the temperature drop down when i drive, even slow.
sometimes i have hot air with the airco, and after some seconds, the air is cold.
when airco air is cold the engine temps is going up.
i have replace my calorstat, i suspect the water pump.
no pressure in the water circuit, no leak, the liquid is clean a brand new.
i'm a bit lost.... water pump or something else ?
i have attached a capture of the temp curve while driving
about 1387 sec i start to drive a bit hard, the temps goes up, then down quick.