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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.
It sounds like one of 2 things happened: 1. You blew a fuse, be sure to check the fuse panel 2. You knocked the power block to the climate control system loose. Check that the power block leading to the climate controll is tight into the control unit
For your brake lights...First check your fuses...next check your brake light switch..that would get your brakes lights working..Now cem control unit??? Do you mean (Climate Control Unit)??
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.
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