White foam in coolan reservoir?
Engine temp is fine.
Heater core got replaced because it was leaking and that now is fine.
Oil is good and oil cap has no foam.
Engine runs fine and smooth, no power loss at all.
Coolant is nice and green. But coolant has a 1cm thick layer of foam on top.
Headgasket or something else?
If it is headgasket, i’ll just try some stop leak product and pray.
If it’s something else then it’s worth a shot trying to fix.
What i was thinking was:
Could it be that when i swapped the heater core, the massive air pocket of bone dry heater core was turned into bubbles and that caused the foam and it’s nothing serious?
Could it be soap in the cooling system if the heater core was pressure tested in soapy water?
Could it be red and green coolants mixed up?
Or is it just plain old headgasket and i need a 2500€ headgasket swap or 6000€ engine swap.
The engine is located under the driver seat and the car is rare in my country.
(Mid engine rwd van.)
Comments
I was going to suggest checking the oil cap and seeing if there was foam there as well, but obviously you checked that already. Is this the first time it’s done this or is it reoccurring?
No foam never.. Take out heater core and put new core in: Instant foam.
Pressure test the cooling system. A picture of the foam would help…
It looks like this:
http://i47.tinypic.com/2djwg89.jpg
Okay i went to my car and looked in the reservoir.. It’s just green normal coolant..
Then i start the car and very slowly froth starts to form in the reservoir.
First guess is air still in cooling system from replacing heater core. Fill reservoir take it for a drive with heat on.
You’re right. It was just air + some stop leak product foaming up. Stopped foaming and works great.
Is combustion pressure leaking into the cooling jacket 🤔
It magically stopped foaming after a drive.