Okay, so I've got a nice little problem that I need help with. I just replaced my heater core, got everything put back together, added coolant, started the car to bleed the lines, bubbles formed as per usual. Everything was fine, I drove around the block, got home and was letting the car idle. As it was sitting there I see coolant pouring out of the resivior and it was bubbling hot.
I shut off the car and let it sit over night. The next day I topped off the radiator and proceeded to rebleed the system. Only this time I let it bleed way longer, more bubbles formed, then I got a white foamy substance.

Bout 20min after the foam started, it stopped and it continued to buble up and overflow from the radiator. A buddy of mine told me to wait and see if the white foam became milky after it cooled. It didn't, it's like just grainy kinda like what ash looks like when you rub it between your fingers from a cigarette.

I've searched all day on here and read damn near 300 post about it possibly being a head gasket.

1. No milky substance in radiator.
2. No coolant on the dip.
3. No coolant on the oil cap.
4. Car idle's normal.
5. Temp reads cold at start up, then once warm it stays at normal temp.
6. The top rad hose is alot warmer than the bottom.
7. Replaced thermostat. (even though old one worked fine. Did hot water test.)
8. Took out all 4 spark plugs, no "sweet" smell or any sign of coolant on them.
9. Pulled off V/C all I see in new oil because I did an oil change at the same time I did the heater core. Stuck my finger in the little crevases and there isn't any seperation of the oil (if there was any water or coolant in there).
10. I double checked the Chiltins to make sure I put the feed and return lines where they were supposed to go when installing new heater core.

I don't know what else it could be. My friend told me the white foam could have been from the system just being gunked up or the new heater core just cleaning itself owt. I don't know what else it could be. Could someone please give me some guidance???!

 

Is there coolant leaking from the heater core? Please tell me you got an OEM heater and not an autozone one.

 

radiator cap maybe?
is there any white smoke? is so is a blown head gasket.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by all-mtr-teg &raquo;</TD></TR><TR><TD CLASS="quote">Is there coolant leaking from the heater core? Please tell me you got an OEM heater and not an autozone one.</TD></TR></TABLE>
It's not autozone, it's schucks

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by God-Driven &raquo;</TD></TR><TR><TD CLASS="quote">radiator cap maybe?
is there any white smoke? is so is a blown head gasket.</TD></TR></TABLE>
It could be the radiator cap. It's the original from 1990. The radiator is new, but not the cap. There isn't any smoke anywhere. Not even when I get on it.

My blower motor is shot so that doesn't work, but when I have the heat all the way to high, as I'm driving there is hot air going through the vents.

 

I would suggest the radiator cap. Friday my car also had coolant pouring out of the reservoir. Once the car cooled down I found out the radiator cap had come completely apart. The car was a 1993 Del Sol, original cap.
As for the milky substance, I am going to say it was something used to manufacture the heater core that was not cleaned out. You may want to do a couple flush and fills to see if it all goes away. Remove the heater core and clean it out. Good luck, hope this helps.