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  1. U

    AC issue

    Check your gauges and ALL connections. Make sure theyre tight. Vacuum pump needs clear fresh oil in it. If theres a leak, look around all piping and connections, especially the condenser. If u see any dark areas or areas where dirt/debris are clinging to the area, you've found a potential leak...
  2. U

    AC issue

    You didnt pressure test nor evacuate the system properly. -25inches Hg is not acceptable. You have a leak somewhere. Find and fix it. Put nitrogen in there up to 125psi and watch the gauges. If they drop more than 2 psi in 5 mins, you for sure have a leak. After evacuating with a vacuum pump...
  3. U

    A/C issues

    Ok cool... I cant remember the cut in point of that switch but.. Awesome im glad you figured it out man Sent from my SM-G975U using Tapatalk
  4. U

    A/C issues

    But that's odd.. you said you have a rad clutch right? So theres no rad fans.. Hmmm Sent from my SM-G975U using Tapatalk
  5. U

    A/C issues

    No. That's not how a 3 wire switch works. Thats a transducer generally. That switch will do 2 things. A... Tell the PCM what the system high side pressure is by producing a varying voltage proportional to system pressure. PCM will then turn the rad fans on high/low as needed or even off. And...
  6. U

    Ac compressor bypass

    Anyone telling you to bypass a high pressure safety switch is an idiot. I wouldnt trust that guy who sold u that compressor. Never bypass a safety switch. Like what doublevive said, buy a new one and put it in.. If that's just a plug, take the plug out, put new sensor in. And be on your way man...
  7. U

    A/C issues

    A 2 wire pressure switch should show only 2 readings.. Closed: 0 ohms or very very low ohms like 0.3 or similar. Or open: OL reading, no continuity. Sent from my SM-G975U using Tapatalk
  8. U

    A/C issues

    Another thing after rereading your original post... I know you meant well by trying to avoid opening the refrig system by just replacing the clutch BUT... If the clutch bearing goes bad, alot of times that will destroy the front bearing of the compressor shaft and also damage the compressor...
  9. U

    A/C issues

    Ok...those 2 fittings are the high and low side to the system. That compression fitting is where the orifice tube is for the front AC system. Btw..your connections look normal with that black rubber stopper in there. Thats normal and what GM uses from factory. 2nd...lets address why your...
  10. U

    Oil leak in the back by the oil pan and starter.

    Hey guys. Question for you all. My yukon was a pretty low on oil today so i added oil and decided to leak check it. Found that there is oil over the starter, the rear of the oil pan, and pretty much over the bottom of the transmission bell housing. I pulled the inspection cover off to look...
  11. U

    Auto Air Control

    Yeah its supposed to be pretty quiet. If its buzzing, its on its way out Sent from my SM-G975U using Tapatalk
  12. U

    Auto Air Control

    What control do you have? Take a pic or post a link to what it is.. If you set the control all the way...to full heat...it should stay there and not change temperature. Once we know what control u have itll be easier to tell what we gotta do next Sent from my SM-G975U using Tapatalk
  13. U

    94 Blazer AC Mystery From Hell!

    Sounds like that control head to me. I would check your powers and grounds thoroughly especially grounds before going further. Sent from my SM-G975U using Tapatalk
  14. U

    Auto Air Control

    Ok.. Most likely youre not understanding how they operate. Assuming you have the controls with actual temperatures written on them? (60F, 65F, 70F, etc) If so, then it will maintain ur cabin at that temperature. Literally any point u set is that set temperature and the blend door will modulate...
  15. U

    Manual trans swap unpopular?

    Im excited to see the results!![emoji106][emoji106] Sent from my SM-G975U using Tapatalk
  16. U

    Heater core replacement.

    Hey chevrol8t.. What was wrong with your heater core? Did it leak or was it plugged? Pretty sure mine is partially plugged and I'm gonna have to do this before next winter Sent from my SM-G975U using Tapatalk
  17. U

    Unknown battery drain

    Lots of good points here. Love it [emoji106][emoji106] Sent from my SM-G975U using Tapatalk
  18. U

    Unknown battery drain

    Again...doubeleive pretty much said this...just elaborating further. You'd be suprised at how the blower circuits can trick you. Listen carefully when the car is off in a quiet area. A while back my mother had an 03 suburban that would drain the batt overnight. No lights left on, nothing...
  19. U

    Unknown battery drain

    Like what double said... Get a test light, disconnect the negative battery cable from the battery. Connect one end of test light to the negative battery cable and the other end to the battery. If the light comes on then start pulling fuses till the light goes out. The fuse u pull that makes...
  20. U

    2000 Yukon-Long warm up time - partial heater core restriction possibly?

    Those clamps are best to keep also. I always resuse them. Constant tension clamps beat a screw or worm gear clamp anyday Sent from my SM-G975U using Tapatalk
  21. U

    2000 Yukon-Long warm up time - partial heater core restriction possibly?

    Any kind in particular? Or just gates hoses from oreillys? Sent from my SM-G975U using Tapatalk
  22. U

    2000 Yukon-Long warm up time - partial heater core restriction possibly?

    Old one had a jiggle pin but not the vent hole like this GM one Sent from my SM-G975U using Tapatalk
  23. U

    2000 Yukon-Long warm up time - partial heater core restriction possibly?

    Pretty much everything on this truck is original. Original hoses and radiator for sure. Fan clutch and water pump I believe were replaced by previous owner. I did this job quick. Just popped off the lower rad hose and then thermostat and replaced it. Then filled back up. Im thinking since this...
  24. U

    2000 Yukon-Long warm up time - partial heater core restriction possibly?

    Update. Got thermostat changed. Heres a pic of them the new ACDelco one is on the bottom and the motorad one that was in the truck is on the top. Anyhow...put it all back together, filled the coolant back up, and test drove it. While it was not as cold today, only 27F instead of 0F lol, Im...
  25. U

    ABS issue..Someone prior to me did this, I KNEW it

    Cool. Thanks a bunch! Can i take the module off the ABS assembly without opening the brake system? Should i worry about the actual pump/valves at all or is it pretty much just the module i need to worry about? Sent from my SM-G975U using Tapatalk

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