A/C Issue/OBS experts help needed

[1997 Silverado]

I have a 1997 K1500 that I am having ductwork problem with. The AC blows cold but after running about thirty minutes while driving the cabin stops blowing through the vents. You can hear the motor louder but very little air flow. I can turn the fan off for about two minutes and then it blows just fine for about another thirty minutes. Anyone got any idea as to why or how to fix this without replacing all the ductwork?? I have replaced the arms at motors on the end of the ductwork but not sure what to do next???

 

[YukonGTmaster]

Were the arms at the motors broken and disconnected? I had a similar issue as you on my '97 Yukon. It ended up being a broken Blend Door Actuator. I would test run the A/C, and choose different settings, Floor, Mid, etc, and have a look at what your actuator is doing. When mine broke, A/C would only blow at the floor. I tie wrapped the door to blow at the mid vents, until my actuator arrived.

 

[wjburken]

I have a 1997 K1500 that I am having ductwork problem with. The AC blows cold but after running about thirty minutes while driving the cabin stops blowing through the vents. You can hear the motor louder but very little air flow. I can turn the fan off for about two minutes and then it blows just fine for about another thirty minutes. Anyone got any idea as to why or how to fix this without replacing all the ductwork?? I have replaced the arms at motors on the end of the ductwork but not sure what to do next???

Sounds like you either have a HVAC controller going bad or the blend door actuator is bad.

The actuator is a fairly inexpensive item and what I’d try first. In the mean time, you can reach under and unplug the harness to the actuator when it is blowing cold air.

 

[Eman85]

The actuator is the one just above the throttle. When it's blowing correctly look at the arms and or mark them with a sharpie. When it changes take a look and see what changed.

 

[east302]

Evaporator may be freezing up (check refrigerant charge) and blocking air flow. As it melts, air returns. My 98 used to do that…I think it would start leaking condensate onto the floor when it froze up.

 

[OR VietVet]

When the problem happens, does the air flow that you do feel, still feel cold? I would bet it is an actuator.

 

[97YukonNZ]

Hi there guys
I am in the process of taking the reaer leaf springs out.
Am going to get them re tempered and a leaf added to beef up load stability as I carry a bit of weight time to time.

My question is and i probably know the answer.
Do I need to drop the tank to move this bolt back to get the leaf out?
Thanks for any help.
Tony

 

[OR VietVet]

New bolts and nuts. Cut the old off and reverse the bolt direction going back together.

 

[97YukonNZ]

The U Bolts look in good condition so I am just giving them a wire brush and soaking them for a minute before
un torking everything before I jack her up.

 

[97YukonNZ]

New bolts and nuts. Cut the old off and reverse the bolt direction going back together.

ahh
Really?
They are in good condition.
Okay. So loosen it all off and get a cut wheel up the inside and cut the bolt closest to the head and it should drop down the gap between housing and frame?
Thanks @OR VietVet
Appreciate your help.

 

[OR VietVet]

Cut the bolt head off, loosen nut first and then cut bolt head off. Then use pry bar to pull bolt either all the way out or to cut off at bracket and punch back in and drop spring. If have to heat, get new bushings. Spring shop can make u bolts.

 

[97YukonNZ]

Cut the bolt head off, loosen nut first and then cut bolt head off. Then use pry bar to pull bolt either all the way out or to cut off at bracket and punch back in and drop spring. If have to heat, get new bushings. Spring shop can make u bolts.

Im thinking that is much better than what I was think'n of doing!
Will prob have to import some U Bolts from Rock Auto.
Not sure if they are a common size here.
Have it all loose now so will jaxk Her up!
Thanks again.

 

[97YukonNZ]

Yup!!!

Glad i will Never have to do that again!
Original springs still look tidy for 26 years old!
But have no guts!!
They made that a Bucket List Job!!!

 

[OR VietVet]

I ran a shop at one time that made springs and we did our own u-bolts. If you are going to add a leaf, great but get the eye bushings done as well. We had torches and welders, of course. The spring guy would have, with a fuel tank in the way, cut off the bolt head and then welded the nut to the bolt and then used impact on that.