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Recently I did some "repairs" to my 89 MJs HVAC system, new Blower + resistor, bunch of other crap. I've been experiencing a phenomenon that I don't remember pre-HVAC repairs where the Blower slows to an almost stop when I'm accelerating up a hill and the RPMs are high, once I get to the top and shift, the blower speeds back up. The problem is I almost never notice it untill it speeds back up so I'm not positive on the conditions which it occurs. I just know I notice it more when climbing hills. Could this be a battery problem? I was thinking vaccum at first but there isn't any lines in the blower that I can recall so that doesn't make sense.

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.

Hi, Got a 92 MJ 4.0. Just replaced the water pump, thermostat (195 deg), coolant, and blower motor... Used to be that I got really hot air coming outta my heater...now it's just luke warm at best. The blower motor was one that had the vent hole (in the motor casing) in the wrong place for me to hook it back up properly, so i left the rubber hose off. Could this be causing me the cold-air situation? ANother thing is that the jeep is running noticeably cooler (like propably 20 deg) according to the dash thermometer...could it be that it's just not warming up all the way for the 195 deg thermostat to open up...? Does that make sense? Thanks!