First you will need to identify the problem. Then maybe a quick how to guide may be found. Or contact manufacturer.
The new Powakaddy Freeway 2 weighs 9kg without battery, 11.5kg with the lithium battery and 19kg with the lead acid battery.
On average an electric cart w/o batteries will weigh between 600 - 700 lbs.
1989 - 2003 36 volt club car with electronic controller. http://picasaweb.google.com/lh/photo/fv70-MU7oCUh6iA4sWQVtg?feat=directlink
I replaced the heater core in my 1989 Golf. If it's the same, you have to lie in a very uncomfortable position (I eventually removed the front passenger seat even to be able to stick my head under...