A/C Two subjects for the tech experts

[John Leuenberger]

. First, in an '82 coach, I am considering replacing the front roof a/c with new 15000 btu unit to increase cooling capacity over the road. Will the factory wiring support this? The Newell installed unit is 13,500 btu. Second question, after traveling for about 9 hrs yesterday in temps of close to 90 degrees with generator running, during fuel stop noted the 200 gallon diesel tank almost too hot to touch. Where would all this heat come from? Hot air from generator and tires? Is this a concern? Thanks and look fwd to your reply.

[TechTalk]

Your factory wiring will support the new 15,000 btu air conditioning
units with no problem.

Diesel engines re-circulate fuel as part of the injection process, and also for cooling and lubrication of the injection pump. During your nine hour trip on a hot summer day, your generator and drive engine
were constantly re-circulating warmed diesel fuel back and forth to
the tank. On long hauls the diesel tank will become quite warm to the
touch, especially when the fuel in the tank is allowed to get low.