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No A/C, driving me crazy.
I had to run a short errand this morning. Decided to grab some data. Seen here is recorded data using Car Scanner ELM OBD app and a Veepeak Bluetooth OBDII adapter. Depending on specific Veepeak model they run from $15 to maybe $30. Some of the PIDs are custom, I created them for the 2005 Yukon...- TJ Baker
- Post #49
- Forum: General Discussion
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No A/C, driving me crazy.
I am measuring. I am seeing what the controllers see. Even if you measure at a sensor that is no guarantee you are seeing what the controller sees, and what the controller sees is what matters most. Additionally I am doing this right from the comfort of the drivers seat. No looking for tools...- TJ Baker
- Post #45
- Forum: General Discussion
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No A/C, driving me crazy.
A/C high pressure will be shown in the engine section. This is because the high pressure sensor is wired to the PCM, not the HVAC module. Anyone with Torque Pro or similar can read the high side pressure if they set up the custom PID for it. It's not hard to do. I can advise if anyone wants to...- TJ Baker
- Post #42
- Forum: General Discussion
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No A/C, driving me crazy.
I have an Autel MaxiAP200 that does much the same. Bought them years ago for $35, they are now like $60. Also of course the Tech 2 knockoff. And then, being the inquisitive sort I read out the HVAC memory of my two GM vehicles and studied the contents. Both are CJ2 automatic systems. I...- TJ Baker
- Post #41
- Forum: General Discussion
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2006 Yukon Denali E fans not working
Have you tried swapping BOTH fan connectors?- TJ Baker
- Post #2
- Forum: Engine & Drivetrain
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No A/C, driving me crazy.
All of those are not related to the HVAC system decision making process. And the PCM doesn't read ambient temperature at all. The ambient temperature sensor is wired to the HVAC controller, not the PCM. That is almost correct, though the cutout temperature varies among models and such. The...- TJ Baker
- Post #29
- Forum: General Discussion
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No A/C, driving me crazy.
Exactly what PIDS are you reading and monitoring in real time? Ambient temperature?? What app are you using? Using an OBDII adapter you can see high pressure reading. It is available as PID 1144 from the PCM. The equation is where it becomes either the raw voltage reading or the pressure in...- TJ Baker
- Post #24
- Forum: General Discussion
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No A/C, driving me crazy.
And so do I. The low pressure cycle switch is nothing more than an input to the HVAC control module. The HVAC control module sees that as one of several inputs to be used in the decision making process.- TJ Baker
- Post #23
- Forum: General Discussion
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Ac Cooling
Simplest answer is the two vents come from different evaporators. The air from the ceiling outlets comes from the auxiliary system and the air from the panel vents comes from the front system. Further, the front system employs a fixed orifice as a refrigerant meterimg device and the auxillary... -
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06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED
For my own curiosity, did your original have a smaller/shorter heat sink than most of the replacements seen online? On mine most all of the replacements I saw online when looking for one showed a heat sink that looked like the one on the front blowers speed module. These physically will not... -
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06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED
I wouldn't say they failed or are defective. I think they simply are not the correct design for this vehicle, regardless of what they are labelled or sold as. -
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Problematic P2135 code
Possibly useful advisement here.... https://charm.li/GMC/2003/Sierra%20Denali%20AWD%20V8-6.0L%20VIN%20N/Repair%20and%20Diagnosis/A%20L%20L%20%20Diagnostic%20Trouble%20Codes%20%28%20DTC%20%29/Testing%20and%20Inspection/P%20Code%20Charts/P2135/Important%20Information/- TJ Baker
- Post #24
- Forum: Engine & Drivetrain
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06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED
I believe it,,, see my post #11. They are not properly manufactured for your rear Blower control system. I would say their application listing is incorrect. Good to hear you got it working now. -
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No A/C, driving me crazy.
Ambient temperature is outside the vehicle. Inside the vehicle is cabin temperature.- TJ Baker
- Post #9
- Forum: General Discussion
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No A/C, driving me crazy.
Has anyone monitored the AC Request Withheld PID? This parameter lists all the prerequisites for compressor clutch operation.- TJ Baker
- Post #4
- Forum: General Discussion
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Suburban died and won't restart (but sometimes it does...)
Post #13. 2005 Suburban 5.3- TJ Baker
- Post #24
- Forum: Engine & Drivetrain
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California smog i/m 02 sensor code needs complete
I cannot accurately describe it cause I don't fully grasp it myself!! For the O2 system I/M readiness monitor to update to YES it is more than one test. There are a handfull of diagnostics that must successfully run and pass. Some of these diagnostics run continuously when the proper...- TJ Baker
- Post #10
- Forum: Engine & Drivetrain
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California smog i/m 02 sensor code needs complete
Have you been able to see what DTC(s) have not run as required for the O2 I/M readiness to update to YES?- TJ Baker
- Post #4
- Forum: Engine & Drivetrain
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Suburban died and won't restart (but sometimes it does...)
NO!! Replacing a CKP requires a relearn and that requires a $$$ scantool. I would never replace a CKP unless it was conclusively proven bad. Most likely an intermittent electrical issue. When it fails to start, what is seen at the instrument cluster? Security light on ?- TJ Baker
- Post #2
- Forum: Engine & Drivetrain
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06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED
It bears repeating... Have you verified that your replacements are getting the power, ground, and control input to the locations designated on the new speed control? Here are a pair of diagrams. one has the 12 volt battery power at terminal A and the other has it at terminal C. -
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06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED
Looking through my stash of parts and such it occurred to me..... I 'think' I once got a replacement blower speed control module where the pin assignments on the replacement were not the same as the original and I had to depin the harness connector and rearrange the order of the connections... -
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06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED
Have you ever depinned a harness terminal? Depin the purple wire at the three terminal connector to the blower speed control module ('resistor'). Reconnect the harness connector without the purple wire in it. If the blower still runs then the fault MUST be the blower speed control. -
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06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED
This sure sounds like a bad blower speed control module. But you replaced that 3 times, right? Same part number each time? Does it match the original part number? For my 2005 I used one from Amazon, labeled Aitken. Shows currently unavailable though... -
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06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED
Mine was quite clearly toasted... -
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06 Yukon REAR HVAC won't shut off -update, WAS resistor - SOLVED
This sounds like you have the automatic control system that uses a solid state blower speed control.module. This is not truly a resistor at all even though it is frequently called that. This is key in understanding what to look for in testing. As I understand it, the speed control works like...
