My 1.6 petrol mini 2008 ( psa engine ) is overheating, the coolent boils, and red temprature Icon comes on dash, what all could be possibilities ? Coolent is freshly change also.
i doubt water pump, pump almost 60000 miles old, what all is recommended to change along the water pump ?

 

Check electric cooling fan for proper operation. A defective fan could cause engine overheating during short commutes and stop and go traffic.

 

Fans are working fine, the thermostat was also changed few days ago, i can see little seepage of coolent under the water pump, but nothing fells on ground .

 

Do a compression test. Leaking head gasket will cause fluid to leak from lotsa different places, while overheating. Also, ensure all air has been bled from the system. Fluid won't flow if it's air-locked at the pump.

 

i did compression test a while ago, it was good too.
recently i changed the oil filter housing gasket, but i remember i did not bleed the air out of system, but coolent have boiled two times, the air would have been bleeded or not? And how to bleed air out ?

 

To bleed cooling system, you access bleeder screw on top of thermostat housing. Check out following video:
at 31:50, they show bleeder screw. You basically uncrew bleeder screw to let air out. Once coolant starts coming out, tignen screw (Note: it's plastic, just has to be snug).

 

OR, use this tool:
https://www.ecstuning.com/b-schwaben...l/003466sch01/

I recently replaced my thermostat, and refilled the system using that tool. Absolutely the BEST tool for filling the coolant system. It is literally as easy as pull vacuum, and fill. Done.

If you have already partially filled the system, you can still use the tool. Pull a vacuum on the system to remove any lingering air, then fill. If the overflow tank gets too much coolant sucked in, just siphon out the excess.