Please help before i blow it up

[iamdolfan1]

1991 ford explorer(exploder)still sounds like a coffee pot percolating!!!! Replaced radiator, water pump, heater core, radiator cap(13lb.). Also tried burping the system (on slight incline and level). It only percolates when i have temperature control to the heater or defrost set on half way point to hot. If i set it on cool it doesn't seem to make that noise at all.

 

[Noved1987]

is there any way there could be air in the heater hoses or heater core? that sounds like what it is to me

 

[konstan]

burping the coolant

Well, if the sound is from the cooling system, and if the heater core and the radiator are ok (not plugged / ruined / etc), then...

My experience with this is as follows

I got a '93 Ex. The coolant color in it was of ferocious quality (looked like rusty water, basically). I drained, refilled with water, ran, drained, refilled, etc.

Obviously after all this there was some air left in the system.

I tried burping it by pinching the upper radiator hose. That helped some but not all the way. Then I drove it for a day, checking the coolant level frequently.

Driving it is what finally made all the air percolate up. Eventually it always does, if everything else is ok.

If not, I would say, there is a chance that there is a place somewhere where the air is entering the system...

 

[konstan]

1991 ford explorer(exploder)still sounds like a coffee pot percolating!!!! Replaced radiator, water pump, heater core, radiator cap(13lb.). Also tried burping the system (on slight incline and level). It only percolates when i have temperature control to the heater or defrost set on half way point to hot. If i set it on cool it doesn't seem to make that noise at all.

I just reread your message... if it only does it when set on hot, I would tend to blame the heater core...

 

[marragtop]

Hopefully it is the heater core, and not a head gasket.