Air from vents stays HOT when control switched to cold. I have to shut the vehicle off and wait and later it will magically switch back and forth again. Maybe related? Sometimes a minute or so after starting the engine I will hear a loud thump from the right side dash area. Haven't positively connected it with the heater sticking on hot
Melted relay
A serious symptom of a problem with the blower motor relay is a burned or melted relay. Relays are exposed to high current loads and can sometimes get hot when they develop problems. In serious cases, the relays may heat up to the point where the interior components and plastic housing of the relay will begin to melt and burn - sometimes even causing damage to the fuse box or panel as well.
Since the blower motor relay is essentially the switch that directly controls power to the blower motor, the entire AC system will be left unable to distribute its cooled or heated air if the relay fails. For this reason, if you suspect that your blower motor relay is having a problem, have the vehicle's AC system diagnosed by a professional technician from YourMechanic. They will be able to determine if the car will need a blower motor relay replacement, or a different repair, to bring full functionality back to your AC system.
SOURCE: 2000 chevrolet tahoe - can't put the gear stick in
It sounds to me as if the cable isnt adjusted properly. I would check with the shop that put the tranny in and see if they could check the adjustment on the cable, more than likely when they put in the new trans they didnt bother to adjust the cable for the replacement transmission
SOURCE: 04 Chevy Tahoe Climate control issues.
HVAC control head problem or it is the air Temp Control Valve problem. THe control head is the one with the buttons and knobs and the control vavle is located on the HVAC carrier assembly underneath dashboard (two of them one on left and one on right in center). This is a job for someone who has knowledge of HVAC and electrical on a GM vehicle.
SOURCE: heater on my 01 tahoe gets stuck on
check your HVAC fuses underneath the steering wheel and or hood. if not the problem, remove the bezel piece as directed and unclip the attachment (see if the knobs are aligned (on track) with one another. its very easy over time for them to slip. its like a zipper. sometimes zippers get kinks as well as the knob. hope this helps
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