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Old Today, 09:26 AM   #1
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Default Heater core thermal overload breach imminent

Ok so the title may be a bit over the top.

I was having a problems with my heater core steaming up my windshield, and creating a coolant smell in the cabin.

I replaced it with a brand new unit from Napa. Installed it and thought life was peachy since I didn't' have to pull the entire dash. I even replaced the hoses leading to it under the hood.

Fast forward 2 weeks, and I started using the heat, and noticed the heat is not that hot, but more importantly when I turn it on the windshield fogs up almost immediately.

I do hear a gurgle when I start the truck, so I know there is air in the core. I plan on bleeding out the air this weekend. I also pressure tested the core so I don't think it is leaking.

(1995 F150 351W E4OD 4x4 Short Bed Singe Cab)



What I don't get is the coolant comes into and out of the cabin via heater core. No mix or bypass valve at all. So if the heater core is not leaking, then where is this steam coming from?
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Old Today, 10:05 AM   #2
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Default

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.
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Old Today, 10:37 AM   #3
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Thanks for the reply.

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.
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1995 F-150 XLT Cobra Edition, 351w, 4x4, E4OD, Shortbed, Single Cab, Wood Trim Interior 31x10.5 R15
Quote:
Originally Posted by mr7confused View Post
Truck breaks down? Effin solder that hoe. No food for dinner? Solder something! Pants ripped? Solder it!!!
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