I used to fit new AC systems (mainly Toyotas but some Range Rovers & other stuff too) when I was on the tools.
I had a few customers that brought in 2nd hand units to fit to their old dungers. Generally, they missed a few bits of wiring or special bolts or brackets (because the wreckers didn't do the job properly I guess). These missing parts added greatly to the cost & time required & made for a sub-standard installation.
As an indicator, it used to take me 45 minutes & cost $950 to fit AC to an SV21 Camry. A similar attempt with 2nd hand components on an RT104 Corona took 2 days & I charged them $500 (the parts cost them $150), it was a POS & there was no warranty. They could have had a brand new aftermarket unit with warranty done for a few hundred more.
My advice is to ring around a few AC places & see if an aftermarket unit is available.
I know nothing about T4s - are they a van or a bus type thing? If it's a van, then get a vinyl curtain (or similar partition) between the cab & the cargo area. It will be more efficient. If it's a bus then get dual air.
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I used to think I was anal-retentive until I started getting involved in car forums
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