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M450 (Unique Issues) If you have a unique issue with your M450 model coach and it can't be answered in one of the other forums here, then this is where you can list it.....list your M450 Parts here too. NO DISCUSSION OF ANY OF THE M450 LAWSUITS ALLOWED HERE.

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  #11  
Old 07-30-2017
Doubledoc Doubledoc is offline
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Join Date: Jul 2009
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I have done some trial and error testing of the fan system I installed in the engine bay. The thermostat is set at about 155 degrees F. Fan-1 comes on under heavy heat loads like pulling a long grade on a hot day. ( Actually the dash temperature gauge rises a bit under these condition as well ). Fan-2 is set to come on at 170 degree F. It has not been on so far. Fan-1 goes off at 145 degree F. I have found that the fan-1 comes on after engine shut down and will run for awhile until thermostat drops below 145 degree F. I was surprised to find that the temperature in the engine bay really climbs after shutdown! That heat needs to be removed to protect the electronics behind the rear closet wall etc.

Since I have a timer on the battery source 12 v dc, I plan to determine how much cooling time is needed to get engine bay temperature down to about 110 degrees after engine shut down.

I do not believe two fans are needed. One will do. Mine are set up as a push /pull system.
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'06 450LXI
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  #12  
Old 08-03-2017
Doubledoc Doubledoc is offline
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I installed a thermometer ( records Hi and Lo and current temperature) about 8" in front of the thermostat in the engine bay and watched temp change under various conditions. This resulted in the following changes:
1. Fan-1 temp "turn on" was raised 10 degrees F to about 165 F
2. Fan-2 was removed from thermostat controll and re wired thru the timer for
manual control.

Now Fan-1 will be available during routine driving and at shut down. Fan-2 will be available manually for up to 30 minutes most likely at shut down when the heat load is high and there is no heat removal.
It was amazing to watch the thermometer climb after shut down with no fans running!
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'06 450LXI
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  #13  
Old 08-08-2017
Buck Buck is offline
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Doubledoc,

Thanks for posting. There is nothing like data to back up theory.
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Buck Jackson
Dickinson, TX
2006 M450 Lxi
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  #14  
Old 08-17-2017
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reelgator reelgator is offline
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Quote:
Originally Posted by rbbuscher View Post
I also put a after market performance muffler on my 450. Not only did it help with the heat in the bed room. It sound great to. Let that Cat breathe.
Robert, just what did you have installed as to your aftermarket muffler?
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