Hello,

Im been struggling with getting air out of the coolant for an month ... i did an complete flush in all of system and it leaves result of air pocket ... what's easy way to fix it?

Thank you

 

First thing I usually try is letting the truck warm completely up from cold with the radiator pressure cap off.

 

Have you ran the heater on full blast with the engine fully warm?

 

What year 4.0l?

2000 and early are different than 2001 and up 4.0l, and its important

Cold engine
Remove 1 heater hose at firewall, doesn't matter which one
Add coolant to radiator until coolant comes out hose and core
Reconnect hose.
Enough air is now out of the system

Replace rad cap
Drive until engine is fully warmed up, or the rest of the day

Let engine cool down over night or at least 4 hours
Remove rad cap, coolant should be full to the very top

If not then you have other issues, not caused by "not getting all the air out"
Coolant leak in the rad or engine system, sucks air in on cool down
Bad rad cap, doesn't let coolant back in on cool down
Plugged overflow tank, same as bad rad cap
Head gasket/cracked head leak, pumps "air" into cooling system when engine is running

4.0l OHV engine, 1990-2000 Rangers, had an issue with head gasket or cracked head if engine is EVER over heated, just one time is all it takes
Search our site for "Glove test"
I have posted it several times, free and easy test to see if you have this problem

 

 

Link had an extra https in it. The one above should work.

 

RonD - it's an 1995 ... i thought it listed in profile ... oops i will add it later and by the way it never overheated

A7thson - thank you for the tip!

ApexKeeper - yup I have heater on full blast at the max

 

Not sure what the video is for??

Thats for a Degas cooling system, you have an Overflow system

Yours is self purging of air
As said unhook either heater hose, fill coolant until it comes out heater hose, put hose back on
Start engine top up radiator put cap on
Fill over flow tank to COLD line
After 5 minutes or so thermostat will open and you should see any air left in the system bubble up in the Overflow tank
Drive truck for at least 20-30minutes, uphills are best to get it fully warmed up, but highway speeds are good to

Stop at home
Look at overflow tank, should be above COLD line now
Let engine cool down
After a few hours Overflow tank should be back to COLD line or below it
Refill to COLD line
Open rad cap, coolant should be at the very very top

If this doesn't happen then you have other problems causing "air in the system"