Nuh uh ;)
The Mixer door in the HVAC controls the Hot/Cold inside the car, there's always some hot coolant in the core as the Valve doesn't seal 100%.
Ziptie is a good way to test though.
If it's a faulty valve/vsv he'll get Heat back if he get's heat for 30>40 seconds it's the CC Amp...
As long as the battery is charged up and the plugs are out it should be fine for a minute or two at a time, by then it should pressurise the whole system and you'll see it on the gauge
I used to use a Blue insulated connector and just trimmed the insulation from the bottom side and it worked perfectly.
The genuine connector has that big rubber cover over the top.
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