i have a seicento abarth and these days the car overheats and the water go out from the cap .i have change new cap and my water pump is new also .
dont seem to have any head symptoms as the water is clear ,the oil is clear and no bubles at start up .also i have check for air in system ...when the car hit 90 the fan start but only for 5 secs and stop but the temperature didnt go down .
tomorow i will give it a flush an see ...any idea ? thank you

Compression test. But try bleeding first.

i have bleed the systen ......couldn be the temp sensor for the fan ? or dirty radiator ?

Stuck thermostat?

Cheers

D

the heater blow hot air and the 2 hoses of radiator is hot after some minutes

Compression test. I can't think of any obvious reason why the fan should behave like that.

Hi

Replace thermostat.

Noel

flush the radiator + new red paraflu but same problem ...snif snif ......
i think the only remain is the head gasket ......

mozart said:

flush the radiator + new red paraflu but same problem ...snif snif ......
i think the only remain is the head gasket ......

Click to expand...

Are you not seeing finger's posts?

Cheers

D

i have left thermostat ...could a stuck thermostat have those symptoms ? today i will change thermostat and see ....or else i will go for hg.....( the compration test is not cheap with the same money i buy thermostat plus fan temp valve )

You can but a working (albeit nothing as nice to use as a snap on one) compression tester for less than £15 posted on eBay.

Still probably the single most useful diagnostic tool.

..today i put the thermostat out .....magic the temp didnt exeed the 90 ....

Try it with a thermostat. Halfords ones are OK, FIAT ones are OK, there are good German and French ones. Don't trust anything unbranded.

new thermostat and fan valve ..... do i need gasket sealant silicone with the new thermostat gasket ?

Nope. I use a little hylomar blue, but it's more for luck and to keep the gasket in place.

Hi

Yes use the gasket rubber, but remove all old gasket traces first from engine, plastic kitchen scouring pad is useful.

either a thin smear of rubber on both sides of the paper gasket
or a thin bead in a circle again both sides of paper gasket.

Let the rubber cure for 30 minutes indoors where it is warm, coat one surface of metal with a trace of oil, and the bolts with a trace of grease on first two threads. Then bolt up tight but dont use much torque you can strip threads.

If you then leave it overnight before refilling it wont leak...

Noel

thaks boys .......