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Power Strokes
6.4 Tech
Strange heat problem
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[QUOTE="SVTDanny, post: 841179, member: 12467"] Hmm, interesting. Maybe I'll try watching coolant system pressure. Sounds like mine, but the heat doesn't come and go. This morning it blew warm/hot until the temperature gauge reached the middle, then was blowing cold air, then a few minutes later started blowing hot again and kept blowing hot the rest of my way into work. Once the heat comes back, it blows hot as can be whether I'm cruising down the road or sitting at a light. It also only does this from a cold start. Say I run to the store and back, when I get back in the truck to come home it'll blow heat the whole way without issue. The problem only happens after the truck sits overnight and is completely cold. My first thought was headgaskets too, but the coolant system holds pressure and vacuum, there aren't any combustion gasses, and it isn't losing coolant or blowing it out of the bottle since I replaced the cap. Also doesn't overheat, run hot, smoke, or show any other typical signs of a head gasket failure. I suppose I could still have a headgasket problem but I just have a hard time believing that at this point. I also thought about the blend door causing the problem, but since it only happens when the truck comes up to temperature from a cold start it seems like a coolant issue. That may be worth exploring if nothing else works. When I drained the coolant and refilled with the vacuum filler, I still had the old, faulty cap (Didn't hold pressure at all, had an audible hiss coming from it once the truck was warmed up) and I think it let the system suck air back in. I hand bled a good bit of air out of the system last night when I got home from work. I'm going to drain the coolant and refill with the vacuum filler again now that I have a good cap and see if that fixes it. If it doesn't, then I am truly stumped. :shrug: The part that I'm hung up on is that when I flushed the Ford Gold coolant to switch to the EC-1, I filled it without a vacuum filler or anything - just dumped the coolant in the bottle, and didn't have any issues. This only started after I deleted the EGR, and I drained the coolant and refilled the exact same way. That would lead me to think there is an issue with one of the EGR block off's, but the system holds 15 inches of vacuum like a rock. :shrug: Also, I deleted the EGR 3 days after flushing the coolant and all I did was drive to work and back, I have a hard time believing that I developed a headgasket issue in 3 days of commuting. [/QUOTE]
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