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Lennox Pulse Question #5338102 02/01/20 11:11 AM
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Gebo Offline OP
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Had Lennox Tech come out to service my 1994 Lennox Pulse. Still working like a charm. He saw my marker dates where I had replaced my flapper every 4 years. He asked me if I replaced it or just cleaned it off. I told him I replaced it. He said that was unnecessary as all I had to to was wipe it clean.

Yes, I know he is a Lennox Tech and he loves the old Pulses. But, is it really ok to wipe the flapper clean? I thought it was some kind of filter???


'98 LEX LS400 305K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 70K

Shell Gas and Truck 5W-30
QS HM 10W-30
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Re: Lennox Pulse Question [Re: Gebo] #5338105 02/01/20 11:14 AM
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terry274 Online Content
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What is a Lennox pulse?


2011 Toyota Avalon
2019 Honda Ridgeline
2009 Ford Taurus
2012 Honda Accord
1996 Ford F150
Re: Lennox Pulse Question [Re: Gebo] #5338107 02/01/20 11:16 AM
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Gebo Offline OP
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Lennox Pulse Gas Furnace

If you have to ask....LOL

Some people say it was the best gas furnace ever built. Sorta a cult following. Some say it was a piece of crap. I'm of the first persuasion...

Last edited by Gebo; 02/01/20 11:18 AM.

'98 LEX LS400 305K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 70K

Shell Gas and Truck 5W-30
QS HM 10W-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: Lennox Pulse Question [Re: Gebo] #5338168 02/01/20 12:24 PM
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MrHorspwer Online Content
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I had no idea what a Lennox Pulse is, so I YouTubed it.

I found a video of a guy explaining how it worked (more or less, I'm not sure how knowledgeable he actually was) and running it (again, more or less) in his driveway.

So, um, yeah, that's what I saw.

Congrats to you though. Your post led me to probably the strangest thing I'll see all day, both the furnace and the rando running it in his driveway on Youtube.

Re: Lennox Pulse Question [Re: Gebo] #5338174 02/01/20 12:27 PM
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Gebo Offline OP
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LOL. I guess I should say, "You are welcome!"


'98 LEX LS400 305K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 70K

Shell Gas and Truck 5W-30
QS HM 10W-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: Lennox Pulse Question [Re: Gebo] #5338236 02/01/20 02:13 PM
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bullwinkle Offline
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I have one, a Pulse 21 from around '95 or so-you have to clean the flapper?? I've cleaned the secondary heat exchanger coil a few times, and replaced the ignition control module twice, but the old girl just keeps growling along, like there's a monster in my basement!


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: Lennox Pulse Question [Re: Gebo] #5338253 02/01/20 02:44 PM
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WhyMe Offline
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Very cool. never knew these existed. so its basically a pulse jet engine kinda .

Re: Lennox Pulse Question [Re: Gebo] #5338284 02/01/20 03:32 PM
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Dave9 Offline
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Even if it is a filter, why would it be a problem to wipe it clean if you get it clean, if it still seals if it needs to, and hasn't rusted out?

Used to be, it wasn't uncommon for furnaces to last 30 years, provided you cleaned them, lubed the motor bearings, and replaced each part in turn, and could either DIY or found an HVAC tech with reasonable rates so it seemed cost effective to keep repairing it.

That's more true today than ever. You can usually find parts on ebay or Amazon and DIY for a fraction of what a pro would charge you as long as you're able and safety minded. That era may soon be over with more complex and expensive electronic controls, thinner metal that rusts through faster. Then again, even 30 years ago the industry had mostly switched to using sealed, non-servicable motor bearings so if you wanted to lube them you have to take the motor apart. Fortunately that doesn't need to happen but once every 5 to 10 years as long as you don't wait till the bearings are chewing themselves up from running dry.

Last edited by Dave9; 02/01/20 03:36 PM.
Re: Lennox Pulse Question [Re: Gebo] #5338321 02/01/20 04:33 PM
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LotI Online Sleepy
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German pulse-jet technology(V-1 buzz bombs) with no moving parts. Still one of the most efficient furnaces ever. I have only had an issue with mine with the ignition system. There have been updates to the ignition and there are aftermarket parts available.

Several years ago I was having short cycling and the tech replaced a tan-colored board that was bad. I recently had a failure to ignite that so far was a fluke. Saturday afternoon I called the emergency number and as the tech answered it fired right up(of course)and has been working fine since. I was following the troubleshooting guide and asked him if it could be the spark plug and he said he’s only replaced one in his career of over 20 years.

My neighbor complains about the exhaust noise but I told him it has both an intake and exhaust muffler.


03 Honda Interceptor
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Re: Lennox Pulse Question [Re: Dave9] #5338322 02/01/20 04:34 PM
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maxdustington Online Content
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Originally Posted by Dave9
Even if it is a filter, why would it be a problem to wipe it clean if you get it clean, if it still seals if it needs to, and hasn't rusted out?

Used to be, it wasn't uncommon for furnaces to last 30 years, provided you cleaned them, lubed the motor bearings, and replaced each part in turn, and could either DIY or found an HVAC tech with reasonable rates so it seemed cost effective to keep repairing it.

That's more true today than ever. You can usually find parts on ebay or Amazon and DIY for a fraction of what a pro would charge you as long as you're able and safety minded. That era may soon be over with more complex and expensive electronic controls, thinner metal that rusts through faster. Then again, even 30 years ago the industry had mostly switched to using sealed, non-servicable motor bearings so if you wanted to lube them you have to take the motor apart. Fortunately that doesn't need to happen but once every 5 to 10 years as long as you don't wait till the bearings are chewing themselves up from running dry.
HVAC contractors are the problem. A new system is more profitable for them so that's what they sell. Also, normies don't wrench and shop purely on price.


99 Toyota Tercel CE 5EFE/C151
Re: Lennox Pulse Question [Re: LotI] #5338783 02/02/20 07:40 AM
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bullwinkle Offline
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Originally Posted by LotI
German pulse-jet technology(V-1 buzz bombs) with no moving parts. Still one of the most efficient furnaces ever. I have only had an issue with mine with the ignition system. There have been updates to the ignition and there are aftermarket parts available.

Several years ago I was having short cycling and the tech replaced a tan-colored board that was bad. I recently had a failure to ignite that so far was a fluke. Saturday afternoon I called the emergency number and as the tech answered it fired right up(of course)and has been working fine since. I was following the troubleshooting guide and asked him if it could be the spark plug and he said he’s only replaced one in his career of over 20 years.

My neighbor complains about the exhaust noise but I told him it has both an intake and exhaust muffler.

Mine does that too, puffs of steam and rumbles when running-but fortunately my neighbor on that side is a retired transit bus mechanic, serviced a lot of DD 2-strokes-he's probably pretty deaf from that!


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
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