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Old 04-29-2013, 03:14 PM   #1
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3126b runs cold

I have a 2001 National Tradewinds with a Cat 330 3126b engine. The engine never runs at the normal temp. It's always way below normal and consequently never provides any heat. I changed both thermostats but the problem persists. Any idea's?
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Old 04-29-2013, 03:41 PM   #2
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My 3126B with new water pump and t'stats runs at 1/3 scale on the gauge, I do get heat, but like most units DPushers it's a long way from the motor to the heater core.
Have you checked the operation of the water control valve ( ranco valve ) to make sure it is opening? I have shut off taps in the heater hoses at the engine , to isolate the core in case of a leak, you could check to see if your coach has something similar,and that their fully open, also rad pressure cap, in most cases the heater core is higher than the top of the rad and the coolant will not circulate through if you don't have the added pressure in the system.
Forgot to ask. New problem or is the coach new to you ?
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Old 04-29-2013, 08:37 PM   #3
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This is a new coach to me. Only got to take it out three times last year when I noticed the problem. Thought for sure the thermostats were stuck open but like I said, I changed both of them and it still runs very cold.
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Old 04-30-2013, 09:11 AM   #4
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I had an over heating problem , and had the w/pump and T'stats replaced. After the repair the t'stat operation temp was confirmed with a scan of the engine control module. Engine is at full operating temp and the gauge sits at 1/3 scale, and other than the day it overheated that's where the gauge sits, when driving.
With new t'stats I would think that your engine is getting to operating temp and that you just have a low reading gauge, and a coolant circulation problem to the heater core is the reason you have no heat.
With 70' of hose , water valve, the possibility of a plugged heater core , there are things that need to be checked out.
BTW. I do get heat , but any time I'm driving in temps around freezing I have to run the RV furnace to be comfortable.
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Old 04-30-2013, 08:07 PM   #5
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All of the school buses I drive, Thomas's on Freightliner chassis',have a switch controlled water circulation pump for the cabin heaters. I am wondering why they don't put them on our motorhomes so that we don't freeze while we're wending our way down the road in colder weather.
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