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if anyone's interested i know its been a long time...but the problem was a failed thermistor...

that diagram is definitely different to the one i have,although I cant confirm the one i have is correct. I will try and scan what I have and post it... on the diagram you posted what is J/C & J/B?

All the fuses are good,originally the AC2 fuse was missing which I replaced,what I'm searching for is a module or something which supplies an earth to trigger the AC relay? The diagram indicates(if correct) that something called a "lock amp" supplies the earth to the relay. Not sure where or...

Thanks for replying, the cab is over the engine.the truck has a 16000L water tank on the back if that helps,I'm from australia . I have the details from the build plate,I'm not sure how to identify the model,but I have the numbers etc

Hi guys, I have a 2013 hino truck ,sorry not sure the model but I have the numbers from the compliance plate. AC will only come on if I supply the AC relay with an earth...when I do this the system all works and AC is cold..the diagram I have has something called a "lock amp" which looks like...

Hi guys,I have a question about a 2013 hino truck, AC only works if I supply an earth to the ac relay ,the compressor etc all come on and AC gets cold The diagram I have has something called a "lock amp" which if I'm correct supply's the earth to the relay? Any ideas?