Heater: Blows hot... just not out the vents - Team Camaro Tech
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post #1 of 23 (permalink) Old Jul 28th, 10, 08:10 AM Thread Starter
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Heater: Blows hot... just not out the vents

Hey guys... got the car running last night and now the heater won't blow air into the car. I can hear the fan running and the "main" heater box is getting really hot but it won't blow out of the main box onto the floor or out of the defrost. (I can feel a VERY small breeze but that's it.) During the engine bay restoration I removed the cover from the firewall side and bench tested the new fan before install. I did also grounded my aftermarket tach to one of the mounting screws but I doubt that has anything to do with it.

Did one of the cables come off?

Vince
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post #2 of 23 (permalink) Old Jul 28th, 10, 08:21 AM
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Re: Heater: Blows hot... just not out the vents

Are all your control unit levers intact and movable? 67-68 models have real problems with the control levers getting fatigued and breaking (just made of some kind of pot metal type alloy) behind the faceplate. They sorta slide like normal up front, but they don't move the cable in back because that attachment is where they break. If I recall correctly from my 68, it is the lever to move from floor heat to defrost that most commonly breaks. Check the repro catalogs, because they offer a repair kit for the most commonly broken lever.

If the levers are okay, I'd suspect one of the doors inside the heater box has either siezed in one position (floor heat) or there are debris of some sort in there.

Eric
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post #3 of 23 (permalink) Old Jul 28th, 10, 08:30 AM Thread Starter
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Re: Heater: Blows hot... just not out the vents

There is some resistance to the leavers but not too much and they feel like they did before.
I don't get any air from floor or defrost no matter which way I put any of the levers and that makes me think it might be the top "ON / OFF" leaver but the fan still kicks in...

I looked from below and it's difficult to see. Is there a trick to checking this?

Vince
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post #4 of 23 (permalink) Old Jul 28th, 10, 09:52 AM
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Re: Heater: Blows hot... just not out the vents

Well, if you can stick a light up in under the passenger side of the dash and sit on that side with a mirror and watch on top of the box to see if the cables are pulling the doors.

Another thought... the cables also have to be anchored at the box end or else the inner cable won't be pulled enough to move the doors. I have seen cars where the anchoring screw clip was either loose/fell off/corroded off.

It won't be easy to see the top of the box with it installed, but with a small mirror and a flashlight, it can be done.

You can also "cheat" and just take all the screws out of the cardboard glove box liner and pull it down and out. That is probably the easiest way to be able to see what is happening on top of the box when the levers are moved.

Eric
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post #5 of 23 (permalink) Old Jul 28th, 10, 09:58 AM Thread Starter
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Re: Heater: Blows hot... just not out the vents

Thanks Eric!
The glove box... That is exactly what I will do.

Vince
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Last edited by vincevs; Jul 28th, 10 at 10:12 AM.
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post #6 of 23 (permalink) Old Jul 28th, 10, 11:41 AM
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Re: Heater: Blows hot... just not out the vents

If you take that plastic heat defuser off the front of the heater box the glove box comes out a lot easier. I think it has about 6 screws and it may keep you from destoring your glove box.

Roger

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post #7 of 23 (permalink) Old Jul 28th, 10, 11:50 AM Thread Starter
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Re: Heater: Blows hot... just not out the vents

Hmmm.... sounds this may be a bigger task than what I was hoping for.
Given the simptoms which lever do you think it is?

Vince
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post #8 of 23 (permalink) Old Jul 28th, 10, 12:14 PM
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Re: Heater: Blows hot... just not out the vents

I don't think anyone ask if this is a AC car?

Roger

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post #9 of 23 (permalink) Old Jul 28th, 10, 02:30 PM
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Re: Heater: Blows hot... just not out the vents

It is not an AC car...

Eric
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post #10 of 23 (permalink) Old Jul 28th, 10, 06:31 PM
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Re: Heater: Blows hot... just not out the vents

When you move the Temp control lever can you hear anything like a door opening or closing? Normally it makes a noise. The cable we are talking about is #1 in the page below. The screw could have came out of the cable clamp or the cable may be off the control arm. The worst case is the door came of the control shaft but I don't think that it becase then the door would be open and you would have heat.
Removing the glove box is the only way to get to this cable.

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post #11 of 23 (permalink) Old Jul 29th, 10, 11:47 AM Thread Starter
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Re: Heater: Blows hot... just not out the vents

Thanks again guys! I should have referenced the AIM.
I went through it last night...
The bottom defrost lever works fine and so does the temp lever. You can acrually see the bolt the holds the flap turning while moving the middle temp lever looking up from the pass side (right where the line from the words "Heater Assembly" is pointing). The top air lever, on the other hand, I can feel the cable moving so it must be connected at the lever but I can't get my hand on top to feel the #6 clip that I assume must has come loose.

So, the procedure to check this would be to remove the plastic from the front of the heater box and then the glove box?

Vince
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post #12 of 23 (permalink) Old Jul 29th, 10, 12:24 PM
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Re: Heater: Blows hot... just not out the vents

I'm not sure about the air cable. The glove box removal was for the temp cable. You may need to remove the radio for the air cable. In any case if you remove that plastic heat defuser it will give you more room.
The cable could also be loose at the control and if the radio is remove you could check that.

Roger

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post #13 of 23 (permalink) Old Sep 22nd, 10, 03:24 PM
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Re: Heater: Blows hot... just not out the vents

Was this ever corrected? I have the same problem. Blower seems to work fine (all speeds functional) but no air comes out of the vents... errr, barely minimal at best. Before I start pulling things apart, I would like an idea of what might be going on. Thanks.
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post #14 of 23 (permalink) Old Oct 1st, 10, 09:58 AM Thread Starter
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Re: Heater: Blows hot... just not out the vents

I haven't pulled it appart yet but I just posted to another active thread that might help us...
https://www.camaros.net/forums/showthread.php?t=185704
Wait a sec, that was your post, so was your motor wired wrong?

Vince
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post #15 of 23 (permalink) Old Oct 1st, 10, 12:24 PM
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Re: Heater: Blows hot... just not out the vents

Before you go "kung-ho" and switch the wires, make sure to check both leads are not tied to ground internally. If both are okay, reversing the leads will reserve a DC motor... in theory. Good luck.

Last edited by tmax68; Oct 1st, 10 at 12:25 PM. Reason: Spell check.
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