Engine Preheat Switch

[Michael Bulriss]

Thanks for the input Steve! So I guess what you are saying is that when you use the engine preheat the engine cooling system and the house hydronic heating system are hooked together and share common fluid when the engine preheat is used? Correct? Guess I should have flushed the house heating system when I flushed the engine and put in new diesel antifreeze. Never thought about that when I flushed the cooling system when we installed the new engine water pump this summer. Good thing I have not used the Primus, so the new antifreeze should not have mixed with the old green stuff in the hydronic system, correct? How long are you in Marble Falls for? Thanks, Mike Bulriss 1991 WB40 "Texas Minivan" San Antonio, TX --- On Thu, 2/18/10, SteveQ wrote: From: SteveQ Subject: [WanderlodgeForum] Re: Engine Preheat Switch To: WanderlodgeForum@yahoogroups.com Date: Thursday, February 18, 2010, 9:28 AM Rick I converted to a Webasto Scholastic unit so I only have one zone. The preheat pump will work regardless if there is heat or not. Steve Quandt 1993 PT-40 Iron Mountain MI now in Marble Falls, TX --- In WanderlodgeForum@ yahoogroups. com, Rick Davis wrote: > > Steve, your Primus has to be turned on for that upper dashÂswitch to circulate fluid to the engine, right? And if so, my coach as two boilers for two zones, so which zone needs to be activated for that engine preheat to work? > > Rick Davis > 1993 WBSA > Loudon, TN > (in New Orleans) > > > > > ____________ _________ _________ __ > From: SteveQ > To: WanderlodgeForum@ yahoogroups. com > Sent: Wed, February 17, 2010 7:01:05 PM > Subject: [WanderlodgeForum] Re: Engine Preheat Switch > >  > Mike > > On to the left, off to the right on my 93. There is a pump, I think it is twelve volts that is behind my house battery trays. It circulates warm hot water / antifrezze mix to the engine and I think the hot water heater from you Primus or Webasto unit. I found mine this summer when I turned on the switch and heard it. > > Enjoying the weather in the Texas Hill country, above zero and no snow to shovel > > Steve Quandt > 1993 PT-40 > Iron Mountain MI > now in Marble Falls, TX > > --- In WanderlodgeForum@ yahoogroups. com, "mbulriss" <mbulriss@ .> wrote: > > > > OK, I have one of those how-to questions that is not answered in 'the book'. On my 91 on the far left topmost driver overhead dash panel, there is a black two position toggle switch labeled "Engine Preheat" - that's it, no "on" or "off" indication, no light. My question is: Is "on" when the switch is toggled in to the left side or the right side of the switch? What kind of electrical draw should I see on any of the gauges when it is on - *if* it is working? > > > > Normally, we try to stay out of such climates where I would actually need said switch, until this past weekend in the Texas hills where it got well below freezing. ;^) > > > > Thanks, > > > > Mike Bulriss > > 1991 WB40 "Texas Minivan" > > San Antonio, TX > > >