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Old 02-16-2013, 01:02 PM   #21
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Well I just pulled both hoses off and not a drip came out. Looked at my very murky and not clear coolant reservoir and it appears to be empty. I think I've got the housing leak problem and I slowly lost a lot of coolant, I checked it earlier this winter and topped it off. I've never seen any on the driveway. I'm going to put the new thermostat in and proceed from there.

EDIT: Yes, the previous owner lived in FL and put in a lower temp thermostat, the one I bought is standard (192 degree?). That alone should improve the cabin heat situation. The car does have some obscure Hypnotic Illusions tune on it from previous owner, hopefully this doesn't introduce new problems. I doubt it.
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Old 02-16-2013, 01:23 PM   #22
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"murky" - That's what's nice about pulling a lower hose - nothing to get clogged or broken when flushing all that unknown sediment out that big hose. I've never used the petcock and couldn't tell you what the drain pattern radius looks like - but call me impatient when waiting for one to drain. Heater core might be plugged if coolant was murky.
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Old 02-16-2013, 01:37 PM   #23
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LOL, no I meant I couldn'ts see through the reservoir plastic to notice that it was low.

So I just put the new thermostat in. The mating surfaces of the thermostat retainer didn't appear damaged at all. Fired it up and added some coolant and noticed there is a steady drip from the bottom of the housing, there's like a metal button coming out of the bottom of the housing and it looks like it's attached with a circlip or something. Does anybody know what this is?

I guess I'm going to take the entire housing off and disassemble it.
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Old 02-16-2013, 02:26 PM   #24
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Looks that way, I'm afraid.

Once you get it off you might be able to rig it somehow.
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Old 02-16-2013, 03:36 PM   #25
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Whynot, here's a thread from !2006! that I think illustrates my problem http://www.focusfanatics.com/forum/s...g+coolant+leak. The sealing surface between the housing and the head appears to be in good shape, and what's in there is a squared o-ring (in this thread you actually theorize that it was originally o-shaped and re-formed over time, which sounds plausible. Let me know if you know this for sure, I'd like to replace it). The housing isn't cracked anywhere. When I saw it dripping earlier it was dripping off the metal plug that is featured in this thread. If there were a leak between the head and the housing I don't imagine the fluid would find a path to drip off this metal thing. I've got an inspection mirror, really wish it had occured to me to use it.

It's even a solid 20 degrees outside, this is starting to get fun. I think I'm going to end up replacing seals and putting it back in.
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Old 02-16-2013, 05:45 PM   #26
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Looks like you found the right old thread to answer your problem.

Pulling the clip to pull the plug & replace the O-ring seems to be the fix from what I read there. A unique to SVT housing apparently....

Luck dealing with it in the cold, looks like a pain to access!
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Old 02-16-2013, 10:08 PM   #27
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There's some bad news. My driveway is littered with dead squirrels and rabbits. Not really, but I probably should have drained the system beforehand and there could be fluffy corpses in the future.

It turns out the metal button thing that's leaking is only there to fill space where a coolant temp sensor might go on a base Zetec. I looked around for o-rings that might work and bought a few that I now know won't work. I got some Permatex thermostat gasket/sealant and used that pretty liberally for the annoying metal thing and will also use a bit for the housing to head mating surface. It turns out the o-ring for that space is a square cut o-ring, and while I think there's no leak there I think some Permatex sealant there is good insurance. If this doesn't work I'll get the thermostat housing from the parts store, it's a revised model that eliminates the annoying metal plug and includes the correct square cut o-ring.

Last edited by 6SPD_soul; 02-16-2013 at 11:55 PM.
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Old 02-17-2013, 10:33 AM   #28
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Man, coolant on the ground is no big deal around critters as long as you dilute it first. I imagine it will dilute some as it comes into contact with frozen water. Like I said, you use a blended coolant, and I'm not sure that is as attractive to critters as the green stuff was. It's sweet. You'd think they would blend in something that would make it taste bad.
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