Vacuum diagram wh L67 1999 holden statesman ?

every possibility that it will as the statesman is just a glorified commodore any way
GM holden used as many common parts as possible to keep prices down

with bodywork either need the equipment that a body shop carries torches-frame racks-hammers dollies[for small stuff]-and unibody tower will cause other areas to be bent =or take to a body shop for estimate

There can be numerous issues that can cause this. The next step is to have the car scanned for fault codes so a proper diagnosis can be done from there.

So take the car to Holden service or to a competent Holden specialist that has the right scan equipment for your car and knows these engines.

Go to library and see if they have repair manual for this car. Otherwise buy one at dealer.

first off , vacuum lines vary by engine. and country
in 1992 there are many SMOG vacuum lines that vary by the laws of your country, .
IS this a HOLDEN CAR, WITH l67 ENGINE>? 1992.
the only way to get this is at HOLDEN and buy the FSM.
sure way.
Down under you are, right>? land of AUZ./

check for condition of the air intake pipes and vacuum hoses as a small split could cause this sort of symptom ,try a fuel addative to give the fuel system and engine components a good clean through ( bit like a decoke but a lot easier and cheaper) may have to repaet to get full benefit follow the makers instructions

Is engine light on? Check for codes . Most likly Tempeture sensor is out of range.

you shold check your battery first
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x-vci tool

We do not have wiring diagrams here at fixya, sorry.

I would think the heater blower motor is shorted.