The heat is transfered from the front vents and does not work when the defrost mode is on. www.trailvoy.com
The speedometer doesn't work. It doesn't respond to the speed we are going.
HVAC (heat and air conditioning) will only work on highest speed. Possible damage to connector or fire.
I would check the fuses.
If you install the new style wiper from the '07 and up trucks it will work great. www.parts4chevys.com has a kit they sell in their Trailblazer section. All you need to know is at www.trailvoy.com
there is a brake in the contacts on the back window
There is a fan motor resistor board located under the dash on top of the plastic duct housing on the passenger side of the vehicle. It is behind the glove box. Removing the glove box will help you to get to the resistor. The power to the fan motor uses various resistances on that board to get your lower fan speeds, but on the highest setting it bypasses the resistors since they are not needed. You always will get your blower motor to work but only on high only when the resistor board is bad.
Either your mechanic does not speak English or does not know what is wrong.
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a loose wire or fuse
Yes, the ignition on a trailblazer can cause head lights to work improperly.
If the front blower and the front windshield wiper do not work on a 2004 Chevy Trailblazer, it could be the fault of the relay switches on the blower and the wiper. Also check the fuse box on top of the battery for a multi-function fuse that might be blown.