The floor is soaked on passenger side front.
Soak some of the wetness up with a clan white paper towel see if it is water or anti freeze 03 could be orange/green or yellow if it is it the heater core ,,,
Have look under the wheel arch to see if there is any rot ,have you had a wnew wing or any body work done in tis area,if not clean & dry the area if there is ahole or rot a temp measure would be silicone from a d.i.y shop
It is a good chance it is anti freeze from a leaking heater core. See if it smells like coolant. If so you can pull the coolant lines off the heater core in the engine bay and put them together to bypass it until it is fixed
SOURCE: 2004 GMC Yukon blows hot air out of the driver
Probably the left temp actuator. The wires in the right I/P junction block could have poor tension also, but it's usually the temp actuator.
SOURCE: I have a 2004 GMC
Remove the Positive Battery Terminal, leave the Negative Terminal connected. Wait 30 minutes. Attach the Positive Terminal. Verify temperature settings is around 70 degrees. This procedure has been known to resolve computer settings.
SOURCE: Where is the ac drain hose located in a 2001 GMC JIMMY?
The A/C drain is located on the BOTTOM of the the A/C EVAPORATOR case , located UNDER THE HOOD against the R/S firewall. Best cleared by raising car on lift and working from underneath. Be prepared for a shower when finally cleared . Hope this helps.
SOURCE: Since I purchased my 2000 GMC Yukon XL 1500 we
You may be right about the sun roof. It should have 4 tubes to drain water that comes in around the glass. Sometimes the tubes fall off letting the water come into the cabin. The horn may be the part in the wheel. Apply it at different angles and it might start working. Sometimes they get rusty. I think your cabin filter would be under the hood near the firewall on the passenger side with a plastic cover.
SOURCE: 2004 gmc dual ac, driver side vents shift from ac
bad blend door actuator maybe there is way to press the buttons on controller to make doors recenter they call it
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