I would think it's condensation and not actually steam. Temperature variance causing fog. As for removing the air from the coolant system, very easy $5 permanent fix. Get a cooling system flush kit and install the tee with the cap in line on one of the heater hoses. From that point on you can flush "burp" the air out of the system with the truck cold and do it in a matter of seconds.
Also....did you flush the system before installing the new heater core? If your old core was corroded and dumping pieces of rusty metal into the system, which sounds like the case if the old one was leaking, then you install a new core allowing it to become clogged. Also a possibility of some water from the leaking core being deposited into the air ducts via evaporation and standing somewhere. Check any low spots in the duct work that might allow a pool to form. I'd also check your condensation drain line. If it's clogged, you could have standing water in there. You can run a 10g solid core wire or coat hanger up the line to clear any clogs from under the passengers side of the truck.
1995 SWB 300 I6, M5OD, 273 gears, 235/75r15's, 21MPG, 50" Led Light Bar, 6" Off Road Lights, Full Synthetic Fluids, K&N RF1012
"Gentlemen, we can rebuild them. We have the technology. We have the capability to build the world's first unstoppable truck. The F-150 will be that truck. Better than it was before. Better, stronger, faster."
Last edited by unit505; Today at 10:15 AM.
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The old core wasn't leaking water, it was more weeping water. When I pulled it out there was no standing water anywhere. It was just a mist on the top of the core. I didn't see any standing water anywhere.
I replaced the engine with a brand new one in the last 6 months, and I put in brand new coolant. So I didn't replace the coolant. Just stopped it up, and replaced what was missing when I finished.
The water that was in the heater core stayed in there as I uninstalled it. When I poured it out, the water looked normal. No rust bits, no discoloration.
I will definitely install that flush kit. Sounds much easier then pulling the hose.
1995 F-150 XLT Cobra Edition, 351w, 4x4, E4OD, Shortbed, Single Cab, Wood Trim Interior 31x10.5 R15
Originally Posted by mr7confused
Truck breaks down? Effin solder that hoe. No food for dinner? Solder something! Pants ripped? Solder it!!!