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Old 11-29-2015, 07:49 PM   #1
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Join Date: Nov 2015
Location: Billings, MT
Posts: 915
Year: 2003
Coachwork: Thomas
Chassis: HDX
Engine: Cat C7
Rated Cap: 84 passenger
Thermostat Rating

I have a Cat C7. The temps at the heater cores only show 80. What is the t-stat rating and are they hard to replace?
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Old 11-30-2015, 02:34 PM   #2
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Join Date: May 2014
Location: West Ohio
Posts: 623
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
Should be 180-195 depending on what was speced out. Check your cylinder head temp to see how warm it actually is. If that checks out fine, some busses have an electric coolant pump to transfer coolant to and from the heaters. Check and make sure that is working. If that is fine, then check to make sure your heater cores aren't plugged up.
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Old 11-30-2015, 05:11 PM   #3
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Join Date: Nov 2015
Location: Billings, MT
Posts: 915
Year: 2003
Coachwork: Thomas
Chassis: HDX
Engine: Cat C7
Rated Cap: 84 passenger
Talked to the stealership this morning, and he agreed with me that the t-stat was caca. Sad part? $50!!! But, that's something I can do all by my lonesome.
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Old 12-04-2015, 06:55 PM   #4
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Join Date: Nov 2015
Location: Billings, MT
Posts: 915
Year: 2003
Coachwork: Thomas
Chassis: HDX
Engine: Cat C7
Rated Cap: 84 passenger
Ended up buying the TWO thermostats for this C7 engine. Yes, I said TWO. But, the first guy was sadly misinformed. Two T-stats and one gasket set me back $36. Yes, they'll be installed, but I still want warmer weather. I got the insulation panels yesterday, but the temps are cooperating.
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