Good morning,
You have a leaking heater core. It can still produce heat but still leak and the mist is the result.
The hard part is the dashboard has to be removed to access the heater case that holds the heater core.
I also do not suggest pressure testing the system as added pressure could make the leak go from a mist to a gush of fluid on the floor.
This job is not pretty. It is involved repair. Are you going to try this yourself?
https://www.2carpros.com/articles/replace-heater-core
Roy
REMOVAL
1. Remove the instrument panel, refer to Body and Frame/Interior Trim/ Dash Board/Service and Repair/ See: Dashboard / Instrument Panel > Procedures
2. Remove the A/C evaporator housing assembly, please refer to Heating and Air Conditioning/Evaporator Case/Service and Repair/ See: Evaporator Case > Procedures
Fig 26 Vacuum Line Removal From Heater Core Seal
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3. Remove the vacuum source line from the heater dash panel seal.
Heater And Evaporator Case Removal And Installation
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4. Remove the seal from the heater core tubes.
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Tuesday, January 8th, 2019 AT 6:38 AM