Is there an updated heater blower? - Team Camaro Tech
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post #1 of 15 (permalink) Old Dec 2nd, 11, 07:58 PM Thread Starter
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Is there an updated heater blower?

The heater blower in my '69 is very ineffective in cold weather. Is one available that blows more air?

Dave

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post #2 of 15 (permalink) Old Dec 2nd, 11, 08:40 PM
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Re: Is there an updated heater blower?

It may just need the fan bearings lubed/services or replaced if the rpm of the various fan speeds are not up to factory specs. Aftermarket higher output fans for other applications are available but I don't know how easy to fit in the original box they are, and the additional current draw maybe an issue.

Or is it a case of the fan output is fine but air leaks around doors, firewall incursions, and leaky vent flaps are overcoming the heater box output? Could also be heater core clogged with sludge so not much getting through. If you feel both heater hoses - is the input hose hotter then the output hose - normal or are the hoses the same and both on the colder side of things? If so you have no flow through the heater core. If they feel the same temp then the fan has failed to dissipate any heat. Flaps on the vent doors have/had weatherstrip like foam to seal them that disintegrates with time and use, but can be resealed. And check those extra unused holes on the fire wall. Rubber and plastic pug kits can seal the original factory unused holes and if new aftermarket accessory holes were standard size and no longer used the same plugs can be used to seal them.

My small block 350 roasts me alive. I wish I could install a fan controlling thermostat so I wouldn't need to keep turning the heat off and open the windows.


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post #3 of 15 (permalink) Old Dec 3rd, 11, 06:21 AM
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Re: Is there an updated heater blower?

I considered using one from an 88 sub that I had but the fan is deeper and wouldn't fit. The motor diameter is larger but it is much lighter. It must be wound with Aluminum or something. I checked the shaft speed with a mechanical tachometer and the fan from the Camaro ran a little faster. I agree with the leaky flaps, I replaced the heater core and re-sealed everything on a 68 A/C car years ago and it would get so hot in freezing weather I had to crack the window to cool off..

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post #4 of 15 (permalink) Old Dec 3rd, 11, 11:17 AM
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Re: Is there an updated heater blower?

Dave the 69 blower/fan works great if it is working at specs. MY heater will run me out of the car when on full heat and mid fan speed.

Somethings not right if you think your blower isnt working as good as it could.
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post #5 of 15 (permalink) Old Dec 3rd, 11, 03:54 PM Thread Starter
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Re: Is there an updated heater blower?

I swapped out the small block heater core for a big block version after I broke off one of the outlet tubes while putting in my 383. At that time I put new seals in the heater case. I can feel air coming out of the vent on the floor just in front of the center console, but it's not much. I'm think of putting in Dynamat (or something like that) after the new year. I will try to address the blower issue then. I will not be pulling the fender off to fix it. I know that much.

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post #6 of 15 (permalink) Old Dec 3rd, 11, 05:24 PM
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Re: Is there an updated heater blower?

Quote:
Originally Posted by Fred Mertz View Post
I swapped out the small block heater core for a big block version after I broke off one of the outlet tubes while putting in my 383. At that time I put new seals in the heater case. I can feel air coming out of the vent on the floor just in front of the center console, but it's not much. I'm think of putting in Dynamat (or something like that) after the new year. I will try to address the blower issue then. I will not be pulling the fender off to fix it. I know that much.
So even just idling in the driveway you get little or no heat, so its not air incursion under the pressure of driving bleeding through the kick panel vents or firewall?

I'm not sure the diameter of the tubing for SB and BB heater cores are the same, I would assume the BB is larger so you may need to replace with the correct core to get the right output.


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post #7 of 15 (permalink) Old Dec 3rd, 11, 07:37 PM Thread Starter
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Re: Is there an updated heater blower?

It's not a heat problem. The blower is not moving enough air.

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post #8 of 15 (permalink) Old Dec 3rd, 11, 08:01 PM
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Re: Is there an updated heater blower?

I used to just put on an air conditioning blower motor and put duct tape over the vent hole. That moved a lot more air.

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post #9 of 15 (permalink) Old Dec 3rd, 11, 09:47 PM
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Re: Is there an updated heater blower?

the squirle cage is plastic and maybe over time it has broken or come loose from the drive or is slipping? Maybe something has gotten into the blower/cowl area and it's glogged up?

You should be able to hear the fan spin when the engine is off, does it spin and does it change speeds with the dash fan speed switch? maybe your switch is bad? You should be able to jump the wires to check this.

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post #10 of 15 (permalink) Old Dec 4th, 11, 04:03 AM
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Re: Is there an updated heater blower?

Does you fan switch work at all speeds. I have had the Hi go out. A new fan motor from auto zone at $25 bucks and seal it all up should work just fine.
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post #11 of 15 (permalink) Old Dec 4th, 11, 06:00 AM
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Re: Is there an updated heater blower?

Is it possible that your heater box under the dash has a door that isn't open? Like the others have said mine blows a lot of hot air. I pulled my used heater motor from a 69 Nova and it works great.

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post #12 of 15 (permalink) Old Dec 4th, 11, 07:01 AM
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Re: Is there an updated heater blower?

Your factory heating system can provide all the heat you need if working correctly. Putting on a higher volume blower will not solve your problem unless as stated earlier your motor is not up to par or your blower wheel is loose.

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post #13 of 15 (permalink) Old Dec 5th, 11, 07:32 PM
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Re: Is there an updated heater blower?

Andrew isn't the only one here who blows a lot of hot air. So do I.

If you're willing to drill a hole in your inner fender to access those nasty fan bolts and then use a plastic plug in the hole you can remove the blower motor w/o removing the fender. Measure twice, cut once as they say.


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post #14 of 15 (permalink) Old Dec 6th, 11, 03:06 AM
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Re: Is there an updated heater blower?

Fred, I would check the blower noise first as Joe suggests, Post 9, without the engine running to hear the different speeds. You can even run a hot wire from the battery to the blower spade for high speed ensuring the motor does turn.

If blower turns at a fairly good rate, then I would check cable action first, as others have suggested, ensuring the cables actually do their function and heater control levers are not broken.

You can remove the glovebox and then remove the heater assembly inside from the dash with all the cables and resistor block hooked up to see the doors work, directing air flow to the floor or defrost, the air temp door adjusting air temp, and feel the air from the blower still mounted on the firewall.

After removing the inside assembly palnuts from the engine side firewall, there is one nut left on the other side of the motor to remove so you can pull off the blower panel from the engine side.

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post #15 of 15 (permalink) Old Dec 6th, 11, 09:05 AM
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Re: Is there an updated heater blower?

Do you know if the "squirrel cage" is on correctly? The open part should face into the interior.

I had the same problem after reassembly and of course, putting the front sheetmetal back on. I figured I must have gotten a weak motor (at the time, GM was still available new and that is what I used), but when I removed it (using the Chevrolet Service Manual procedure without removing the fender, as I have detailed in other posts here), I realized I had the squirrel cage backward, with the solid/domed part toward the interior. The fan will go on and fit/turn without interference either way, so...

I bought this 69 in boxes, and it had been a long time since I had replaced the blower motor on the 68. The OE motor had the fan on backwards as described, and I just transferred it to the new motor without even thinking about it.

It acted exactly as you describe; at full on, it barely moved air out the dash top or down to the floor. Installed fan right way round (after losing much arm and hand skin), and it will easily keep me warm even with the top down with ambient temps into the upper 30s.

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