petehall12 Posted April 7, 2023 Share Posted April 7, 2023 When I turn the knob on for the directional valve on my heater everything moves but the air still blows out of every location. Is there a book on how to tear that box apart so I can replace that flap Quote Link to comment https://www.bigmacktrucks.com/topic/72697-2004-cv-713-hvac-air-flow/ Share on other sites More sharing options...
Joey Mack Posted April 7, 2023 Share Posted April 7, 2023 Heres the book.... Pull the cup holders to get to the front cover torx screws, then remove the front cover, there are screws down each side as well.. check to see if the metal control rod has popped out of the plastic clip for the flaps.. if the clip is broken, you can get one from Oreillys in the Dorman section. It will be a multi pack.. -OR- Suck down the A/C,,, pinch the heater lines on the fire wall and remove them from the nipples,,,,,, pull the cup holder off then you will see the hidden torx screws in the front, there are screws down the sides also,,,,, unplug the main plug above the throttle pedal, the wires go behind the HVAC unit. with the front cover off you can see how it runs,,,,, then pull the floor pan and the shifter if you want to... (much more room to work) once you unbolt the HVAC unit from the fire wall the unit tips out, pull from the bottom and rotate upward,,,, then you can service the unit on the bench... Make sure you stock up on patience.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/72697-2004-cv-713-hvac-air-flow/#findComment-528692 Share on other sites More sharing options...
petehall12 Posted April 7, 2023 Author Share Posted April 7, 2023 Thanks Joey was hoping I didn’t have to pull the whole hvac box. The rods are hooked up and you can see where it hooks up and it is turning but it is not moving the air flow. but is what it is Quote Link to comment https://www.bigmacktrucks.com/topic/72697-2004-cv-713-hvac-air-flow/#findComment-528698 Share on other sites More sharing options...
Joey Mack Posted April 7, 2023 Share Posted April 7, 2023 do you hear clicking noises? it is a series of plastic gear teeth. Im sure you assumed that.. there is a svc. bulletin on it. I beleive it came out around 2003.. i think we replaced the whole mode box under warranty. I will try to find the bulletin. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/72697-2004-cv-713-hvac-air-flow/#findComment-528699 Share on other sites More sharing options...
Joey Mack Posted April 7, 2023 Share Posted April 7, 2023 sb635008.fm.pdf here is the Svc. Bulletin.. Quote Link to comment https://www.bigmacktrucks.com/topic/72697-2004-cv-713-hvac-air-flow/#findComment-528700 Share on other sites More sharing options...
petehall12 Posted April 8, 2023 Author Share Posted April 8, 2023 No Joey I don’t heard any clicking or moving of the flap in the mode box I ordered the kit to Rebuild the mode box I appreciate the service bulletin that will make it easier for me to take it out knowing we’re all the bolts are 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72697-2004-cv-713-hvac-air-flow/#findComment-528728 Share on other sites More sharing options...
Joey Mack Posted April 8, 2023 Share Posted April 8, 2023 Good deal.. keep in touch.. Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/72697-2004-cv-713-hvac-air-flow/#findComment-528730 Share on other sites More sharing options...
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