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spankyjr1, RV Mechanic
Category: RV
Satisfied Customers: 2595
Experience:  I have been a mechanic/ technician for over 30 years working on gas,diesel,engines drive train,and electronics.
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Our 2008 national tropical motorhome is over heating. When

Customer Question

Our 2008 national tropical motorhome is over heating. When the engine is just started you can hear the three speed fan cycle through from low to medium and to high and then back medium and then low and will repeat this all the time. The Cummins mechanic has not figured this out and I need to know what is the problem. HELP!!!
Submitted: 1 year ago.
Category: RV
Expert:  spankyjr1 replied 1 year ago.

Sorry for long delay.

Could you post engine model number and serial if you have it?

Is the engine overheating all the time?

Please explain when it overheats, does light come on and what color light?

If you happen to know what codes were pulled?


Have you lost any coolant?

any smoke out breather tube or exhaust?

Let me know

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