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99 TJ 4.0 manual HVAC vacuum lines routing

6.2K views 5 replies 5 participants last post by  RUBI 4 MY MRS  
#1 ·
Hello all, I've tried searching for this info but haven't found anything. I'll give a quick rundown...

99 TJ 4.0 5 speed has been living on the island of Puerto Rico for the past 10 years. Mice/rats have had a good time nibbling on my electrical and vacuum lines while hoarding almonds. My question is from the back of the thermostat controls in the cabin where do those vacuum lines go? I've had the dash off and still can't see what dimension these lines run into. I've concluded that the lines from the hvac controls plug into another section just behind the glove box area but from there I'm baffled. The lines that run towards the firewall have near zero play or give. I need to know what wormhole or portal these 6 lines go to before I permanently torque the dash down so I don't have to do that again (what a nightmare). Being a tropical island I need the AC at times so any insight would be greatly appreciated.
 
#6 ·
Here are links, the 1st has some photos of an HVAC unit taken out of a jeep that shows some of the vacuum line routing which may help you. The 2nd one is a long one on heater core replacement with a ton of photos including some with the vacuum lines showing & might also be helpful if you have to take your HVAC unit out to replace some lines. Many photos…

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TJ Heater Core Replacement- TJ Generation

Here is a look at the vacuum line connection from the back of the panel in case you need it.

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