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Old 08-20-2022   #13
DRM500RUBYZR-1
 
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Join Date: Sep 2008
Location: Mullica Hill, New Jersey
Posts: 2,566
Default Re: Heater core recommendation needed + another HVAC issue

VERY Likely the same animal.
Use the Factory Service Manual to identify vacuum hoses and routing for the HVAC supply.
A smoke machine will assist, although if the leak is big, it will quickly envelope the behind dash area.
It is either a, hose, connector, or the programmer itself.
It is there, just search from origination to the programmer.
Others correctly cite the courtesy light area under passenger side dash.
If the hose has been disturbed, and now rests on the bulb, it can melt it.
Most of the time we encounter previous rodent damage.
Good luck, you will find it!

Marty
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