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I've looked at numerous pics and vacuum drawings, but I still haven't figured out what these are. This is on an 88 Pioneer w/air, 4.0, 5sp manual. My blower blows all the air through the defrost, so I thought these might be the vacuum lines that work that. I am referring to the black and white lines that come through the firewall just below the overflow tank and above the blower motor. Its been a great week for Jeep projects. I got my parking and blinker lights going again, got an alternator, vacuumed leaves from the blower motor, mounted the rear view mirror, got a new hood, did the headlight wiring upgrade, and fixed the broken headlight adjusters,

So I have some time and I decided to pull my dash and HVAC box to fix my water leaks which I originally thought was coming from the fresh air intake but it appears now it's all the blower motor seal/foam. When I pulled the dash I discovered all kinds of exposed wires, dirty grounds, smashed/pancaked heater tubes and all sorts of nonsense so I'm making it a general clean up. It was also an excuse to put as much Dynamat (well, a knock off) on the firewall as I could. Anyway, now that I'm sitting here with this nonsense, I'm kind of regretting it... I didn't find it all that complicated to take apart. It was pretty straightforward, the issue is just the foam is all rotting and in horrible condition. The only part's I can find are these but they're listed as 97+ and I have an 89. They look right but even if I got those and they worked all the blend door and interior foam is trashed. In another post I found that someone used this product for the blower/fresh air seals and this for the blend doors. Mine is in good enough shape that I could probably use it as a template so right now I'm leaning towards that being my best option but I'm curious if anyone has any magical suggestions (besides set it on fire). There's way more foam in the box than I thought there was. I'm going to replace my heater core/evap/blower while I'm at it but that's pretty much killing my budget atm lol.

Okay so here in Michigan the temps have been close or below zero for most of the month. My issue is that sometimes my heat will not work. What happens is when the truck warms up fine to operating temperature, I turn on the heat and cold air blows out. What I have done to try and fix this is back flush the heater core. Which did help because when the heat does work the air is a lot hotter than before. There was quite a bit of crud in there. What I assume now is that: 1) I am not getting enough vaccum to open the main air flow gate which either lets ambient air or heated air through. 2) The main gate is frozen somehow 3) vaccum leak somewhere...? After the temperatures outside increase a little and the inside of the truck warms up a bit, the heat works fine. It is only when the mornings are arctic cold. Am I right with my assumtions or is there anything else I should check?