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the heater core is removable from the climate control unit. The climate contriol unit has to be removed to replace it. The A/C system must be evacuated and lines removed as well as the dash, to access the climate control unit. The steam is coming from a leaking heater core.
All 3 are possible problems. A fuse is most likely the problem unless something got spilled leaked its way into the unit. Check all the fuses with a test light first before you try and replace the unit
I had the same problem. Fixed it by changing the climate control knob assembly on the dash. I was able to get a brand new one still in the box on ebay. Cost $150.00 the 1995 will not interchange with any other year even though others look similar the back is different. New they wil run into the $300.00 range. You get all knobs and switches including the push buttons for the AC. These units require a gentle touch easy to break. Good luck.
Could be the controller or a faulty blend door. The blend doors direct air thru the heater core and evaporator along with the vents. The controller uses electric motors to change the direction of air flow.
there are two separate actuators for the rear system. one controls temperature and the other controls vents from head to feet. mine problem was the later. that acutuator for esv 2003 is 89018365. it is located just below third seat cup holder passenger side and can be replaced simply by removing cup holder. triangular shaped part with wire harness.
I had the same problem on my 2004 GMC Yukon XL.
Still under warranty the shop was able to reprogram the climate control system and tell what was wrong rather quickly with a OBD computer.
That’s when they found both of the climate control (driver and passenger) side actuators were bad and the control unit that tells the actuators where they should be was also bad.
The truck was in the shop with most all the dash, seats, consol, and steering wheel out for a week. The cost was over $1200.00.
That has seamed to fix the problem. Good Luck.
Is the "Rear Air" control switch above the driver seat turned to "Rear" if so, turn it to "off" or Front and you can control the climate for the rear cabin. If this does not work, then a relay may be stuck.