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Old 08-05-2017, 04:55 AM   #1
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Warning lights

my warning lights for stop engine and check engine came on twice during pretty hot conditions and I was pulling my truck. Lights and beeping sounded for short period and stopped. I eventually pulled in to refuel and went to the rear of the rig. Could not visually see or smell anything wrong. Any ideas? Thanks
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Old 08-05-2017, 05:17 AM   #2
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What rig and engine?
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Old 08-05-2017, 05:31 AM   #3
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05 Excursion Cat 350, Cummings trans on Freightliner chassis
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Old 08-05-2017, 05:38 AM   #4
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I have a C7 Cat and it got hot last summer. The warning lights went off and I pulled over to cool it down. I have a rear radiator and it was stopped up for oil and road grime. Are you down shifting to keep you RPMs up on the long pulls? Also have you checked your coolant and oil levels?
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Old 08-05-2017, 05:55 AM   #5
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Had coolant and oil changes done recently. Yes am downshifting at times on long pulls. thinking it happened while in 5th speed.
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Old 08-05-2017, 05:57 AM   #6
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We have had 90% humidity and 88* plus weather.
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Old 08-05-2017, 06:08 AM   #7
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I would check the radiator to see if the fins are stopped up. Mine was almost solid with gunk. It's hard to check. I used a remote camera.
Mine was over filled with oil and it blew it out the slobber tube and it went straight in to the radiator. I have now extended the tube to the rear of the coach.
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Old 08-05-2017, 06:22 AM   #8
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Opps. I said Cummings trans. It is an Allison.
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Old 08-05-2017, 06:45 AM   #9
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If your engine temp is staying above normal, you may have a dirty CAC (charge air cooler).

It is located between the cooling fan and the radiator and is best cleaned by applying cleaning solution from inside the fan shroud.

Some use a solution of Dawn dishwashing detergent or Simple Green (Aircraft) cleaner (save on aluminum) via a pump garden spray applicator and saturate it several times to dissolve the grease and grime inside the grill.

You need a strong flashlight
and mechanics extension mirror to see inside and make certain you get in the corner areas real good.

You may have to repeat the process several times to get it clean.

Please let us know how you make out if that, or something else, turns out to be the issue.
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