Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
yes, battery first.
i wouldnt add any untill you know the pressures though
30 to 40 low and 150 to 250 high.
some of the fill kits only have low pressure gauges. if you notice that its below 30, than there is a good chance hat it is low though
never over 40 psi running for the low
adding too much will cause the exact same symptoms as low freon
the system is designed for a certain amount of freon.adding a little too mutch can be worse than having not enough
those are operating pressures and will vary with rpm and outside temperature.
if you notice that its low at around 20 and the compressor is cycling fast than its likley low and need a top up.
dont let it past 250 at idle and the cooling fan is on
here is a youtube video that can help