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the hot / cold blender door is probably broken and blocking the air flow from blower motor. This is a common problem for Dodge trucks and requires you to remove the dash to repair.
Original equipment manufacturer, ie G.M. Delco parts, Dodge Mopar, Ford motorcraft. If the part was not the same as installed by company that bult it, it is a after market part.
pressure control solenoid, and shift soleniods are located in the transmission on the valve body. you will need to remove transmission pan and fitler. soleniods are usually held in place with a clip that pulls out and pushes back into place after solenoid is replaced electrical connection is clip type also. you will need to be able to jack up car and support it, work will be done underneith the car. basic tools will be all that is needed for this repair
ABS (and Brake) lights on together could be caused by low brake fluid in the master cylinder or brake pads worn out and calipers extended to far. I would look at these first then scan for codes. scanner will tell if it is a wheel speed sensor and which wheel it is. Or if problem is in the control module
look in fuse box under the hood, to see if you have a bad fuse to LH low beam. If fuse is good, check for power to bulb socket. Be sure when replacing these type bulbs you don't touch the bulb with your bare fingers, oils in your skin can blow bulb.
move selector switch from hot to cold and listen inside the vents for a change in fan sound. If nothing changes the blend door or door motor is a great place to start.
sounds like you have lost power to your body control module. take it to near by auto parts store see if they will scan for free to see if it has stored code. this wouldn't show a check eninge light for this problem. code reader has to look at more then just PCM.
If it is blowing fuses, unplug the blower motor and repace the fuse see if it still blows fuse. Check for power at the blower motor plug, If no power may be fan speed resistor. If you have power to the plug your blower motor is probably bad.
they might of unplugged a sensor that didn't plugged back in, like power steering pressure switch. or could be other problem unrelated to that repair. If they won't check it out again for free take it to a auto parts store near you for free scan of codes and see what shows up.
you probably blew a head gasket, you wouldn.t need to replace the engine. replace the head gasket , have the head refaced and checked for cracks machine shop will do both of those for about $70.00