Diagnose-No Power/No Air Flowing In Rear Vents

[crabbman]

2002 GMC YUKON XLT. NO RESPONCE FROM CONTROL KNOBS LOCATED ON UPPER HEAD BOARD.
NO AIR, NO HEAT, NO COLD , NO FAN SOUND, AT THE THREE VENTS IN THE BACK PASSENGER AREA.
WHERE DO I START MY INVESTIGATION?
FUSE BOX?
SIDE KICK PANEL WHERE THE POWER CORD IS?
i will; wait for reply.
thank you.

 

[Rocket Man]

Did it just start failing or did you just notice? Either way the first thing to do when any electrical item in a vehicle stops working is to check the fuses.

 

[crabbman]

not sure but somehow my daughter says i have no air, no heat, no blower motor in the back passenger area. this is my daughters car and i am the official Mr. Fix it please .
yes i have checked a 10 and a 30 amp fuse which shows it is an a/c fuse. i am not finding a rear a/c seperate fuse location.
thank you, Rocket Man

 

[crabbman]

sorry i was able to look at the power connection cord located behind kick plate and i am not seeing any burned or frayed wires anywhere.

 

[Rocket Man]

Have you checked it yourself? The controls can be set to work from the rear or from the front. There’s several different types in our vehicles too- auto, non auto, digital etc. so maybe take a couple pictures.
Edit: there’s a separate fuse for the rear HVAC in the under hood fuse panel. Here’s a pic of my 02 Denali owners manual; the pen is pointing at the fuse, it’s labeled RR HVAC.

 

[crabbman]

yes, i rechecked my diagram and i found three fuses that work a/c. the fuses all look to be in working order. metal is not burned or cracked inside fuse

 

[crabbman]

 

[crabbman]

 

[crabbman]

thank you rocket man. not sure what you mean i can control the rear from the front. HERE ARE MY CONTROL KNOBS. LET ME KNOW HOW TO OPERATE THESE KNOBS?
thank you.

 

[Doubeleive]

you will have to proceed to checking the rear system then, you will want to check rear blower motor, rear blower motor resistor and rear control module.
this guy is a popular one, you can skip thru about the first half of the video, he is replacing a actuator but getting access to the rear is basically the same from 00-14