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Remove the belt and test motor for amp draw. If motor runs normal, most likely problem with compressor or check valve. If still high amp could be short in windings or motor start switch stuck on. If motor does not turn (loud hum) try spinning by hand to see if it starts. If motors runs after spin by hand, bad capacitor. Good luck
If it trips the circuit breaker as soon as you turn the FAN on, suspect either a bad fan motor or a failed fan motor start capacitor. If you are able to turn the fan on but the circuit breaker trips as soon as the COMPRESSOR starts, it is possible that the compressor is seized. If, on the other hand, the unit is tripping a GFCI (Ground Fault Circuit Interrupter) breaker or GFCI utility outlet, it is possible that neutral and hot are reversed at the outlet into which the trailer is plugged (happened to me this year at an RV park).
Most people recommend replacing the motor capacitor in this situation, since a faulty cap will reduce the starting torque. But in my case the check valve was the culprit - there was too much back pressure on the head.
'Breakers' - are tripped because they are exceeding their amp limits.
The 'hotter' it gets outside - the 'harder' your AC has to work - and under normal circumstances this is not a problem - but when you have a fan motor or a compressor that is starting to 'break-down' (electrically) - often the AC's amp draw will exceed the limits of the breaker - thus 'tripping' the breaker.
I would suspect either the fan motor or the compressor is causing your breaker problem.
Eventually - the component (either the fan mtr or compressor) that is 'going bad' will go out completely and your breaker will 'trip' and not stay on when you try to reset it.
At this point you will need a Service Tech to determine which one is bad.
There is a possibility that your condenser coil (the one that blows hot air) is 'dirty' which will also cause a problem similar to the one you have - but it is less likely.
Also - if you've had the AC 're-charged' lately - it's possible you are in a 'over-charged' condition - but again, this is not very likely.
450 out of 600 what? sounds like you have somthing drawing power need an amp meter. remove key and leave window down. disconnect negitive battery cable and connect meter between the negitive cable and negitive termainal on the battery should see around 2.5 milliamp draw or less may take 1/2 hour to get to this point. also if this vechile is not driven often this could be the problem
First, reset the breaker. If the unit restarts, you're okay. If possible, change to another good circuit of comparable rating...generally at least 15-20 amperes...sometimes the breakers go bad. You may have a bad compressor or compressor start relay. We can only know about that after the breaker is ruled out as a cause. Oh, and be sure the plug contacts are not corroded. If they are: use a little steel wool to clean them and remove all strands when you're done.