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Can anybody give me a hand.I recently had a new condenser and air dryer replaced on my 1999 Mack Vision. It started cooling a little, but not as cold as it should. I recently added a can of r134. The floor of the cab started getting soaked. I noticed a leak under the dash beneath the center console. I vacuumed out the drain line on the firewall. When I started the truck back up, it would not cool and the compressor would not engage. The troubleshooting sensor light near the radiator now says it's working properly, when before I used the vacuum it was telling me there was a problem. Does anyone know why this may be happening? I didn't even mess with any of the AC lines index the hood.

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Sounds like possibly a bad evaporator. My 2000 was blowing warmer than it should and I figured with 36,000 hours it was time for some love. I put in a new expansion valve, new evaporator, new drier and new compressor. She's back to cooling like new! Cost me $290 in parts and Freon. Dont buy the compressor from mack. They get $300+ just for that. I got mine off ebay.

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  • 4 weeks later...

I didn't know what it needed. This think has me more than confused. Damn ed if I do, damn ed if I dont. Too much or too little can cause the same problem. Jeez. My carpet is swamped. I just need to know how to clean the evaporator or drain, or whatever from inside where the water is coming from. I see it leaking. No pictures of anything online. Can you get to it from inside, possibly from passenger seat footwell. I tried to reach the hose on the firewall, but my arm won't bend that way. Any detailed help will be greatly appreciated. There has to be a more direct way to get to it from inside.

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This chamber that resembles a tunnel coming out of the right hand side of the AC dashboard console be removed to get to the filter and evaporator? I've taken the front cover off before where the thermostat is, but I'm not sure I can pull out the squirrel cage and evaporator to clean it without mistakenly damaging something. This AC had cost me $2000 this summer so far, and I don't want to go back to Nextran again. $130 an hour is breaking me. I'm a DIY guy anyway. Sorry for the rant. Just need a break. Thanks guys.

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