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Old 05-27-2016, 04:17 PM   #1
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1996 DT466 Thermostat Issue!

Hey Everybody, My 1996 Int 3800 (DT466 mechanical) is failing to circulate coolant through to the heat exchangers so I'm figuring I have a bad thermostat.

I ordered a replacement only to find that the thermostat on the top of the engine (radiator hose coming out of engine block) is completely different.

Is there another thermostat somewhere else in addition to the one in the thermostat housing on top of the engine?
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Old 05-27-2016, 05:02 PM   #2
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My 1996 Int 3800 (DT466 mechanical) is failing to circulate coolant through to the heat exchangers so I'm figuring I have a bad thermostat.
I guess maybe rephrase your question? Are you saying you dont have any heat going to the heaters inside the bus?
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Old 05-27-2016, 05:06 PM   #3
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I guess maybe rephrase your question? Are you saying you dont have any heat going to the heaters inside the bus?
Yeah, that's about the size of it right there. Nothing coming into the front and nothing going to the rear. All valves are open.
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Old 05-27-2016, 05:09 PM   #4
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Meh...that doesnt sound right. Engine operating temperature ok? Is this a new bus to you? Have you had hot water to the heaters before? If not, are you SURE you arent missing a valve? Low on coolant?
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Old 05-27-2016, 05:19 PM   #5
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I've had the bus for a few years now. All valves are open and coolant level is good to go. I'd "heard" that if the thermostat in the DT466 fails "closed", than coolant won't circulate to the heater cores. I can't verify this but after taking her out for a spin, the engine is definitely up to temp but it seems that coolant isn't circulating back to the heater cores. This is why I thought the thermostat was failed shut.
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Old 05-27-2016, 05:32 PM   #6
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Got it. That fine of a detail for a DT is too many years behind me to remember.

Someone will chime in, I just thought I'd answer while others pondered.

However, I would think if I thermostat was stuck closed, you'd have engine overheat issues.
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Old 05-27-2016, 05:47 PM   #7
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Got it. That fine of a detail for a DT is too many years behind me to remember.

Someone will chime in, I just thought I'd answer while others pondered.

However, I would think if I thermostat was stuck closed, you'd have engine overheat issues.
I thought that as well so I haven't pushed it much. I figured the DT466 on short trips would at least get to temperature without overheating with a closed thermostat. I'm stumped. I tested the thermostat located in the t stat housing (top of engine, large diameter rad hose attached). It opens at around 180-185 degrees F. I'm wondering if there's another thermostat housing somewhere near the oil cooler?
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Old 05-27-2016, 06:01 PM   #8
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does that bus have a boost pump for the heaters? ive seen before where those pumps stop at a point where they refuse to allow flow.. try turning that pump on if you have one...

-Christopher
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Old 05-27-2016, 06:13 PM   #9
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Is there not a 1" or so line coming off the top of the radiator tank? That should bypass the thermostat and go to the heaters....if I recall.
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Old 05-27-2016, 07:21 PM   #10
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Did you check the valves that might be closed? Many schools shut them off when it gets warmer to keep from heating up the bus on the inside.
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