Coolant reservoir full of white foam.

[Jsp]

So previously i had a problem with the heater core fogging up the windows and now i changed the heater core..
My next problem is foam in the reservoir.. It didn't have this problem earlier. Just now after i filled the reservoir.
It's probably HG leak. I don't have money nor the tools to take out the engine and change the headgasket and get the head and block machined so i'm going to try some stopleak product.

I wonder if there's a way to test if it's really the headgasket for free?
Oil cap looks clean and the oil dipstick is free of foam.
The engine runs great and the temps are normal.

ONLY SYMPTOM IS FOAM IN THE RESERVOIR.
I wonder if the guys who tested my new heater core tested it in soap water and there's soap in the cooling system?

[Jsp]

https://www.youtube.com/watch?v=dM3Zan1qnmY

That is happening in my previa..

Head is probably warped.
Gonna call the dealer if i can get my money back. If not then i'll just throw in head gasket repair and hope it fixes it.

[Ace MM]

so i'm going to try some stopleak product.

I wonder if there's a way to test if it's really the headgasket for free?
Oil cap looks clean and the oil dipstick is free of foam.
The engine runs great and the temps are normal.

ONLY SYMPTOM IS FOAM IN THE RESERVOIR.
I wonder if the guys who tested my new heater core tested it in soap water and there's soap in the cooling system?
Losing coolant?
Steam out the tailpipe?
see if you are building excessive pressure or making foam while running. That's a free HG check.
So is a compression check.

Stop leak might get you home, not to be used daily, regardless of claims.
I wouldn't use it.

[Kurtanius21]

Take it to a shop that has a gas analyzer. You want to know for certain if it is a headgasket.

[tbkilb01]

Dont run it hot! HG is not that difficult at all. The engine does not need to be removed, just lowered a bit. Unless you have damaged the head etc., then it just costs extra. But its really a EZ job, and you get to do some poking around, cleaning allot of undercarraige stuff. Throttle body, coolant, oil, tranny, rear diff, all hoses, egr, etc while your underneath the van, might as well, it will all be there and easy to access and see. Was it running good before leak? You Just gotta work low to ground for a while. At least you wont be humped over working under hood for hours.
It doesnt even take that many tools. A couple of wrenches...everyday stuff. Check head for cracks, warp, vaves, etc. clean it good and put new gaskets where needed. Dont use the Stop Leak!

[Jsp]

It was previous stop leak + air bubbles out of new heater core. It stopped foaming. It works perfectly. Not loosing coolant and no issues. It fixed itself.