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Old 09-13-2007, 10:12 PM   #1
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As the weather starts chilling I thought I'd do a little survey. At what outside temp do you begin to turn on the engine pre-heat? Just curious to see what the thinking is out there...
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Old 09-13-2007, 10:12 PM   #2
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As the weather starts chilling I thought I'd do a little survey. At what outside temp do you begin to turn on the engine pre-heat? Just curious to see what the thinking is out there...
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Old 09-14-2007, 03:09 AM   #3
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32 Degrees
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Old 09-14-2007, 03:23 AM   #4
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by RVDude:
As the weather starts chilling I thought I'd do a little survey. At what outside temp do you begin to turn on the engine pre-heat? Just curious to see what the thinking is out there... </div></BLOCKQUOTE>

Jeff,
I would like to add to that . How long does it take? Is it on the whole night before departure?
Thanks, Daryl

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Old 09-14-2007, 03:26 AM   #5
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Jeff, The "engine preheat" is not enabled on Newmars. While the engine, when running, circulates the engine coolant through the HydraHot which heats the unit from engine heat, there is no HH coolant pump or lines to circulate the HH glycol out and through the engine. So basically that switch does nothing, except illuminate the pilot light within the switch.
So we only have the "block heater", which can be operated from the panel over the driver providing the block heater plug is in the switched duplex box in the engine compartment. I generally use my block heater if the temps are in the 30's.

Interestly the ISM and ISX, unlike the ISL and down, use no electronic starting aid (glow plugs or heat grid). Though you will see a yellow "Wait to Start" light when the key is turned on and for several seconds, but there is no electric chamber preheat. The ISM and ISX use a precombustion chamber designed into the cylinder head that heats with compression. That's why, if you notice, the ISM and ISX do not start nearly as quickly as does the ISL and down as they must rotate several times prior to firing.

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Old 09-14-2007, 03:53 AM   #6
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Nice post Peter...

Other than my annual migration to Nappanee for winter service ( ) I use a more pleasing manner of preheating the engine....it's called FLORIDA!!
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Old 09-14-2007, 04:03 AM   #7
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Lug_Nut:
Jeff, The "engine preheat" is not enabled on Newmars. While the engine, when running, circulates the engine coolant through the HydraHot which heats the unit from engine heat, there is no HH coolant pump or lines to circulate the HH glycol out and through the engine. So basically that switch does nothing, except illuminate the pilot light within the switch. </div></BLOCKQUOTE>

Hi Peter,
On my 2008 I have the Oasis System and there is a button labeled (Engine Pre-Heat) under my control for it. Is this button a dummy?
Thanks, Daryl

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Old 09-14-2007, 04:09 AM   #8
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by RVDude:
As the weather starts chilling I thought I'd do a little survey. At what outside temp do you begin to turn on the engine pre-heat? Just curious to see what the thinking is out there... </div></BLOCKQUOTE>

There being no downside to using block heater (other than a minor power cost) and a lot of upside, I turn on block heater on whenever temperatures go into low 50's before turning in for evening before departure.
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Old 09-14-2007, 04:27 AM   #9
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Daryl, I don't know about the '08's with the Oasis system, but the '07 and down with HydaHot and not enabled. The OP has an '07 I believe. If anyone knows about the Oasis having this enabled please post up.

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Old 09-14-2007, 04:29 AM   #10
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Having had block heaters on boats that constantly caused the gaskets to warp and leak(when left on), will not use until below 30-saw only once this year in Arizona(18).
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Old 09-14-2007, 05:35 AM   #11
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by UPS 34:
32 Degrees </div></BLOCKQUOTE>
Ditto.
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Old 09-14-2007, 07:08 AM   #12
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Just to clarify terminology...

I DO mean "block heat" be it Electric/HH-optional/Oasis. So at what temp (and for how long) do you turn it on? (Arizona and Florida are good temperatures too)

Yes, HydroHot on newer Newmars the HydroHot DOES have a HH preheat feature (engine heats the HH while running) but the pump to reverse this (HH heats the engine) is optional whereas on the Oasis I think it is standard for the Oasis heats the engine pump.

It appears the HH pump to heat the engine can be simply added for about $300, it is a pump that installs in the engine-to-HH "preheat" lines thus providing engine heat from the HH. www.rvcruzer.com/preheater.htm
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Old 09-14-2007, 01:13 PM   #13
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I talked to Newmar today. The button labeled engine pre-heat in my 2008 MA is a dummy. The pump needed can be added by a dealer for a small fee ($ 275 ).
It still makes me wonder why put the button if you did not plan on using it.
Thanks, Daryl

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