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Open Roads Forum  >  Tech Issues

 > Two zone heat installation in a 2000 Discovery 37V.

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lilduckdog's dad

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Posted: 07/28/12 12:25pm Link  |  Print  |  Notify Moderator

Help ! Set heat setting to 90 and slide switch to heat for both front and rear on climate control panel. The rear fan comes on and the furnace ignites and runs just fine. The front does nothing but the green light is on, on the climate control panel. The 12v fuse panel is located just behind the charger, inverter, converter, and there is one 15 amp fuse which is marked "rear heat". Can't find any other fuses. Everything else works fine, gas tank is full, 12v supply is fine and shore cord connected. It seems like the fan is blowing really hard at the two rear floor registers at the foot of the bed. Does the front run off of the same fan and is there some kind of a baffle that diverts heat to the front or rear or both ? There is only one furnace. I am totally baffled as to how this works.
Any help will be appreciated.

hershey

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Posted: 07/28/12 01:42pm Link  |  Print  |  Notify Moderator

If I follow your description correctly: you have two furnaces. One works properly but the other ones fan works without any heat? I had the same problem on my 2000 Expedition (kissin' cousin to your Discovery) and the sale switch had to be replaced for the furnace to ignite and work properly.


hershey - albuquerque, nm
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pulsar

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Posted: 07/28/12 02:24pm Link  |  Print  |  Notify Moderator

Moved from Forum Technical Support to Tech Issues.

mchero

Concord, NH

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Posted: 07/29/12 11:36am Link  |  Print  |  Notify Moderator

The sail switch is INSIDE the furnace. It's basically a micro-switch with a large "arm" or "sail". When the blower motor starts up the force of the air from the blower pushes agains the sail causing the switch to close. This tells the "brain" that the blower is functional and it ready for the burner to ignite. No sail switch, no gas to the burner.

* This post was edited 07/29/12 06:17pm by mchero *


Robert McHenry
Concord, NH.
2007 Fleetwood Discovery 39V
2005 Jeep Grand Cherokee
Prior:1993 Pace Arrow 37' Dieselhttp://dieselrvowners.com/forum/index.php

lilduckdog's dad

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Posted: 07/31/12 09:02am Link  |  Print  |  Notify Moderator

Thank you so much MCHERO for the super explanation of what the sail switch looks like. You made my day. Been working on the entire rig including rebuilding one of the powergear jacks and following the instructions on replacing the ac belt without removing the fan. All went well, but when it is something electrical it scares the heck out of me.
We are new to a class a. lots to learn. Hope to stay in AZ this winter, not that the NC winters are very cold in northeast NC though they can be. We are retirees and have never been off of the east coast. Probably going to stay in the vicinity of Mohave or Bullhead City. There is a nice organization nearby called the Mohave Gold Seekers and we will be seeking a membership soon.
Also it may be of interest to some, we just purchased a set of six SAMSON (made in China) GL283, 275/70/R22.5 tires at Camping World, Colfax, NC for $2,485.00 including mounting, balancing and sales tax and disposal fee. A six year old set of Michelin XRV, with little or no mileage, tires were removed. We no longer feel the left to right roll and wandering, and the lean left or right when exiting and entering the highway. The ride does not seem any harder than the Michelins except when hitting a pothole. The only negative so far is some road noise in the rear, though not bad. They track straight and true.
We drove 300 miles home from camping world and can't believe the difference. The Michelin's had 100 lbs in each tire and the motorhome is empty excluding a full tank of fuel, full propane tank and about 20 gals. of water.
From what we were able to find as to who makes these tires, it seems Michelin is the parent company. If you put the two tires together, as they were when they were being mounted, the only thing that looks different is the name on the tire, the tread appears to be identical. They are 16 ply and also have a 6400 lb single axle rating at 120 lbs.
Thanks again for your help I am going outside and look for the sail switch.

lilduckdog's dad

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Posted: 07/29/12 10:20am Link  |  Print  |  Notify Moderator

Does anybody know where the "sail switch is" on the 2000 Discovery for the front heat zone ?

mchero

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Posted: 08/12/12 08:11am Link  |  Print  |  Notify Moderator

Glad to be of assistance! I moved up from a tent trailer to a 36' monster! LOL
I'm fortunate that I'm an ex-mechanic. Takes lots of work to keep these older rigs on the road. Currently on a trip from NH to CA and back. In Vegas at Samstown RV park waiting for the (*&$(*$ office to open so I can pay for last nights stay.

Safe travels.

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