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Old 04-26-2015, 09:25 AM   #1
Mini-Skoolie
 
Join Date: Mar 2015
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Year: 1991
Coachwork: Thomas
Chassis: Saf-T-Liner
Engine: RE Cummins 5.9
Radiator cap Cummins 5.9

Hey all, driving home we found out the radiator cap was not included on my 1991 Thomas saf-t-liner. Anyone know a comparable cap? The guys at the auto store are no help. Waiting on you!
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Old 04-26-2015, 09:44 AM   #2
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Year: 1992
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Rated Cap: 72
Oh god, here we go again.

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Old 04-26-2015, 10:45 AM   #3
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Location: Russell, Kansas
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Year: 1989
Coachwork: Thomas
Chassis: Saf-T-Liner ER
Engine: 3208 CAT/MT643 tranny
Rated Cap: 87
Probably a 10 pound cap. I'll look tomorrow and see if there's a part number on the caps at the lot......
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Old 04-26-2015, 11:26 AM   #4
Mini-Skoolie
 
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Originally Posted by M1031A1 View Post
Probably a 10 pound cap. I'll look tomorrow and see if there's a part number on the caps at the lot......
A fella from Napa found the part... Now to figure the next hurdle
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Old 04-26-2015, 01:33 PM   #5
Mini-Skoolie
 
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Year: 1991
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Chassis: Saf-T-Liner
Engine: RE Cummins 5.9
So I am trying to diagnose the overheating issue, it seems to me that the radiator fan isn't running. When I turn on the vehicle it spins for a moment and then turns off. Any ideas?
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Old 04-27-2015, 02:06 PM   #6
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Chassis: Saf-T-Liner ER
Engine: 3208 CAT/MT643 tranny
Rated Cap: 87
Usually the fan is controlled by an in-line sensor that trips when the temperature gets warm enough and the thermostat opens up. So either the sensor is going bad, the thermostat is not opening up, or the water pump impellers are rotting out and a new pump is needed. Those are the three options. Take your pick.
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Old 04-27-2015, 02:34 PM   #7
Mini-Skoolie
 
Join Date: Mar 2015
Posts: 26
Year: 1991
Coachwork: Thomas
Chassis: Saf-T-Liner
Engine: RE Cummins 5.9
Quote:
Originally Posted by M1031A1 View Post
Usually the fan is controlled by an in-line sensor that trips when the temperature gets warm enough and the thermostat opens up. So either the sensor is going bad, the thermostat is not opening up, or the water pump impellers are rotting out and a new pump is needed. Those are the three options. Take your pick.
Thank you I will try to locate and check these things.
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Old 04-27-2015, 02:36 PM   #8
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is it a hydraulic fan?maybe fluid is low or bypass is bypassing?
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Old 04-27-2015, 02:44 PM   #9
Mini-Skoolie
 
Join Date: Mar 2015
Posts: 26
Year: 1991
Coachwork: Thomas
Chassis: Saf-T-Liner
Engine: RE Cummins 5.9
Quote:
Originally Posted by bansil View Post
is it a hydraulic fan?maybe fluid is low or bypass is bypassing?
I'm not really sure how to tell. When I go to work on it tonight I'll take pictures and a video of what it does.
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Old 04-27-2015, 05:58 PM   #10
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Year: 1989
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Engine: 3208 CAT/MT643 tranny
Rated Cap: 87
Bansil,

Do you mean a thermal clutch fan?
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