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Old 01-18-2005, 06:23 AM   #1
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I have a 2002 Itasca Sunrise with Suburban SF-35 furnace. The furnace works ok as far as heating goes. The problem is that I get a metal to metal type screeching sound when it cycles off.
All this time I thought it was normal, now I am not so sure... anyone else have this issue?
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Old 01-18-2005, 06:23 AM   #2
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I have a 2002 Itasca Sunrise with Suburban SF-35 furnace. The furnace works ok as far as heating goes. The problem is that I get a metal to metal type screeching sound when it cycles off.
All this time I thought it was normal, now I am not so sure... anyone else have this issue?
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Old 01-18-2005, 06:56 AM   #3
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I take a guess; perhaps the sail switch has shifted its 'sail' slightly, and when the blower stops, the sail falls and rubs against the ductwork. (?)
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Old 01-18-2005, 07:05 AM   #4
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On my 2003 Suncruiser I had the same thing when new. I read about this problem right here on IRV2 and told my dealer what the fix was. The metal damper would rub against the plenum as the blower coasted to a stop. He removed the furnace and gasketed the damper with foam rubber weatherstripping under warranty and all was well after that.
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Old 01-18-2005, 07:06 AM   #5
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Thanks for the reply troth, I will have to check that...I am looking at a diagram now. That switch looks pretty small, I cant imagine it making all that noise but who knows.

Cruzer, that sounds like the problem.. do you know where this damper is located? I do not see it on the diagram. I waited too long and I am now out of warranty.
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Old 01-19-2005, 05:08 AM   #6
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The sail switch will just hang up if it rubs - not enough mas or energy to make a squeal. It's got to be the fan motor rubbing on the housing as it coasts down. That suggests to me that it wobbles or is cockeyed on its shaft. It's OK when it spins fast enough for centripetal force to pull it straight, but rubs as it slows down. It's not obvious to me how a gasket can fix that, unless it is used to shim the side of the housing away from the fan. At any rate, somehow you will need to straighten up the fan or re-align the housing.
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Old 01-19-2005, 06:18 AM   #7
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<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>......
Cruzer, that sounds like the problem.. do you know where this damper is located? I do not see it on the diagram. I waited too long and I am now out of warranty. <HR></BLOCKQUOTE>

They had to remove the furnace. The damper is right at the exit area of the blower fan.
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