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post #1 of 8 Old 08-21-2010, 08:02 PM Thread Starter
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Unhappy Overcooling

Hi there, we have several 6.4`s at work in 550s. We are in ND where it gets rather cold in the winter. When I start mine up to warm up, it will not warm up until you start driving even if it runs for over an hour. after driving for about 5 minutes the temp starts to come up and it starts blowing warm air. it just wont warm up even with the winter front on and plugged it if temp is cooler than about 20. if left idling after it has been warmed up it will cool down to where the gauge is at cold all the way. just curious if anyone else has had this problem and cured it.
thanks in advance
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post #2 of 8 Old 08-21-2010, 08:21 PM
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cardboard in the grill to stop airflow

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post #3 of 8 Old 08-21-2010, 08:24 PM
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Originally Posted by dereku View Post
cardboard in the grill to stop airflow
He already said he had the winter front on....
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post #4 of 8 Old 08-21-2010, 08:28 PM
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Oh thats what a winter front is didnt really catch that. You could always go extreme and take the fan off and put an electric one on. Then it wont cool.

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post #5 of 8 Old 08-21-2010, 08:33 PM
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Or just put the truck into high idle.....
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post #6 of 8 Old 08-22-2010, 12:11 AM
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Sounds like your thermostat isn't closing all the way. I'd try replacing that first.

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post #7 of 8 Old 08-22-2010, 12:42 AM
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post #8 of 8 Old 08-22-2010, 06:44 AM
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You need to monitor a few things. ECT/EOT at road speed when the engine is fully warmed up, see what the difference beteween the two is. You can likely do this now, I don't think you're gonna see 20 degrees anywhere in August. Also monitor the FANDC and FANSS pids at idle and road speed and see what they are doing.

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