Diesel pusher overheating
New owner of 1993 Cobra Riviera 35' diesel pusher with the 230hp Cummins . Only 37,000 miles on coach with a good maintenance history. Driving home from Las Vegas to Moab had temps rise as high as 230...
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Had similar issues with a 1999 Safari Serengeti with a CAT 300 engine and rear radiator (which I hate - really bad design). First, check where your engine "blow-by" hose is located. Very often they are routed where the oil blow-by will be directed on to the radiator from the front side. If the hose is not WELL below and aft of the radiator, extend it! Secondly, you MUST drive these units (rear radiators) differently... and it's a pain! When it's hot and you see hills on the horizon you MUST DOWN SHIFT MANUALLY to keep the RPM up BEFORE starting the climb! You want to keep the RPM near peak torque (typically 2,100 RPM)while climbing. To do this you must down shift before the engine starts to lug (where a normal down shift would occur). By keeping the RPM up, you will maximize the air flow across the radiator achieving maximum delta "T" on your cooling system. Remember, it's not the speed your concerned with but the RPMs to achieve maximum cooling. Hope this helps...
