For that DTC, a few things need to be checked.
Test the refrigerant system for proper freon charge.
Check the condenser and hoses for damage or restriction.
Test the air conditioning fan for correct operation. With the engine off, should spin with some slight resistance. With the engine...
The vehicle learns how you drive. It's called Adaptive Strategies. "
You can disconnect the battery for 30min. This will reset the learned adaptions.
See if this works.
It was a new engine. No quote for a rebuilt.
When I did the leak down test, air was leaking past the rings and into the crankcase.
With the engine running, you can remove the oil filler cap and check for excessive blow by.
Valve stem seal failures are extremely rear.
A leaking valve stem seal would only show up on engine deceleration, like exiting a freeway ramp. i.e. high engine vacuum.
Have it diagnosed.
No point guessing what is wrong.
Easiest thing to do is, see if the compressor comes on at all when you start the vehicle up and cycle the height switch.
You have to remember.
The batteries might be made by the same manufacturer. But. The batteries that don't meet the quality criteria are sent to the big box stores.
Whenever the battery is disconnected, the engine learned parameters are erased. This won't set DTCs.
A drive cycle will need to be performed.
https://www.jdpower.com/cars/shopping-guides/how-to-perform-a-basic-drive-cycle
The heater core can be replaced without removing the dash. The coolant pipes just have to be tweaked a little bit while removing.
Basically, remove the center console and HVAC control panel.
Cam sensor failures are extremely rare.
I would check the related connectors at the front of the engine. Make sure no coolant in them and properly seated.
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