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Stesso

Project Overview and Initial Setup

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Finally Getting Air Conditioning Back? Testing the LSXcalade AC System!

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What happens here

The presenter introduces the main projects for the day: resolving speedometer inaccuracies after a transmission swap and wiring the AC compressor to a manual switch for direct control. He explains that the complex factory AC pressure switch on these vehicles (specifically, like an oil pressure sensor, not a simple on/off) makes a direct bypass necessary for this custom build. He also mentions the speedometer issue requires 10k resistors on the output speed sensor wires and that he's already installed a coolant temperature sensor in the transmission pan, wired to the ECU harness. He plans to install a new rocker switch for the AC next to an existing converter lock-up switch in the vehicle's console.

Goal: Understand current vehicle issues and plan wiring solutions for AC and speedometer.

Tools and materials

  • AC Compressor — To provide cooling for the vehicle's cabin
  • Coolant Temperature Sensor — Monitoring transmission fluid temperature
  • Existing Rocker Switch — An existing switch in the console, providing a reference point for the new AC switch
  • Output Speed Sensor Wire — Provides speed data to the speedometer
  • Pigtail Connector — Wiring the transmission temperature sensor
  • Resistors — To correct speedometer readings from the output speed sensor wire
  • Rocker Switch — To manually control the AC compressor
  • Transmission — The replacement transmission that caused speedometer issues
  • Wiring — Extending speedometer sensor and AC compressor connections (green wire shown later)

What they say

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today's project is actually a handful of different things I'm going to wire the AC compressor in the Escalade put a couple of resistors in the output speed sensor wire for the speedometer and extend it because now my transmission has 400 gears in it 400 year set it does not have a reluctor on it for a sensor because for hunters don't have that so I got to use the one on the transfer case now and the reason for the resistors are if you saw in my older videos where we went up to test the trans brake and my mile-an-hour kept jumping up with RPM even though I wasn't moving that can cause we tell by them some noise there again the fix for that is to put in a 10k resistor in line on both the speed sensor wires so that's what I'm doing there for that I actually may wire up trans temp to what you might be thinking Wow of all the transmission issues this guy's had he doesn't have a temperature sensor well you're right when I did the extreme automatic valve body I didn't have a sensor and anymore because the sensor used to come from the connector well with that valve body the factory style connector is gone it's replaced by two pegs one for lockup and transbrake that's it so since then I've drilled and tapped the pan put a regular coolant temp sensor in there got the pigtail wired it up to the inside the console here and I just got a pin to the appropriate inputs on the ECU harness I'm sweating like a mofo here right now which is part of the reason why I'm finally wiring up the AC compressor it's not any wiring up the right way I'm just gonna put on a relay and a switch yeah well Logan over there has like a 99 Silverado and he said something with his messed up so he's put his he didn't put it on a switch he's wired to the ignition so it's always engaged and it's building that for years in the hot Texas summers and he's never had a problem so I'm like well heck I'll do the same thing because currently the the pressure switch on these things is like a three wire deal like oil pressure sensor it's not just a simple on/off that you can wire in line so I'd have to configure it in the ECU and set all the Preferences and blah blah blah blah it's a pain in the butt and I'm just not gonna do that so I was just explaining

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