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Discussion Starter #1
No matter what position my selector's at, heat, defrost, vent, etc. I get cold air out of the vents. I've seen many posts of similar problems and most responses are it's probably a vacuum leak. Where do I look? Throw me a bone people. This is my first Z and I know nothing about it, but, I LIKE IT!!! I live in Wisconsin and it's gonna get pretty **** cold here real soon. Somebody PLEASE help.
 

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Discussion Starter #2
> No matter what position my selector's at,
> heat, defrost, vent, etc. I get cold air out
> of the vents. I've seen many posts of
> similar problems and most responses are
> it's probably a vacuum leak.
> Where do I look? Throw me a bone people.
> This is my first Z and I know nothing about
> it, but, I LIKE IT!!! I live in Wisconsin
> and it's gonna get pretty **** cold here
> real soon. Somebody PLEASE help.

I am going to be really basic so if you know this stuff disregard it. Basically the air is heated by the heater core which is a mini radiatior in the center counsil.. Coolent flows through it and thus heats the air that passes through it. So....make sure the heater core is hooked up to the engine coolent...look on the passenger side of the engine compartment..are there 2 heater hoses approximately 1.5 inches in diameter going into the fire wall from the engine? If yes ok...if no you need to let me know.....
So if they are hooked up next thing to check is if anyair at all comes out by your feet or just out the vents....check this out and get back to me...Answer these 2 questions of mine then i will be able to diagnose your problem better tomorrow night. Hang in there bro....Travis 77z
 

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Discussion Starter #3
I have no doubt that Travis will help you, but I am going to suggest a completely different idea: park the Z for the winter and drive a POS like an Escort, Buick or something cheap and already rusteaten. My logic: 1) the Z was not one of the better rustproofed cars, the salt will eat thru the metal real quick, unless you have a VERY good rustproof job. 2) why risk a great car to the potential of another nincompoop's poor driving and smashing into your Z? 3) I've never driven a Z in the snow, but most high performance cars tend to be not-so-good in slippery conditions (high torque, fat tires, and all that). BTW I did live in Pa. for 35 years, so I am familiar with snow/winter condidtions.
Or you could move out to Southern California or Arizona where you have to go to the snow on purpose. Good luck

> No matter what position my selector's at,
> heat, defrost, vent, etc. I get cold air out
> of the vents. I've seen many posts of
> similar problems and most responses are
> it's probably a vacuum leak.
> Where do I look? Throw me a bone people.
> This is my first Z and I know nothing about
> it, but, I LIKE IT!!! I live in Wisconsin
> and it's gonna get pretty **** cold here
> real soon. Somebody PLEASE help.
 

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> I am going to be really basic so if you know
> this stuff disregard it. Basically the air
> is heated by the heater core which is a mini
> radiatior in the center counsil.. Coolent
> flows through it and thus heats the air that
> passes through it. So....make sure the
> heater core is hooked up to the engine
> coolent...look on the passenger side of the
> engine compartment..are there 2 heater hoses
> approximately 1.5 inches in diameter going
> into the fire wall from the engine? If yes
> ok...if no you need to let me know.....
> So if they are hooked up next thing to check
> is if anyair at all comes out by your feet
> or just out the vents....check this out and
> get back to me...Answer these 2 questions of
> mine then i will be able to diagnose your
> problem better tomorrow night. Hang in there
> bro....Travis 77z
I am having the same problem. Heater hoses connected but air only comes out of center vent. 1973 Z Thanks in advance
 

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> No matter what position my selector's at,
> heat, defrost, vent, etc. I get cold air out
> of the vents. I've seen many posts of
> similar problems and most responses are
> it's probably a vacuum leak.
> Where do I look? Throw me a bone people.
> This is my first Z and I know nothing about
> it, but, I LIKE IT!!! I live in Wisconsin
> and it's gonna get pretty **** cold here
> real soon. Somebody PLEASE help.
I'm going to try and answer this question again....

When your selector is in the heat position--the vacuum source from the white vacuum tank(the plastic thing on the passenger side of the engine compartment) goes into a magnet valve(electrically actuated valve which if stuck closed--can be bypassed if temporarily just so you can have heat)

That in turn, opens the air intake door. The vacuums activates the mode door for heating and outside air flows into the heater core. The activation of the heater core is through a vacuum operated water ****. Heat is discharged in the opening above occupants feet.

Since only cold air is blowing thru the center vents--check your vacuum hoses--and especially the magnetic valve(its about the size of a roll of lifesavers) and there is 2 identical ones near the plastic vacuum bottle.

Good luck--and if you need the darn schematic, I'll scan it and put it up on my web page.

Chung
 

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> I'm going to try and answer this question
> again....

> When your selector is in the heat
> position--the vacuum source from the white
> vacuum tank(the plastic thing on the
> passenger side of the engine compartment)
> goes into a magnet valve(electrically
> actuated valve which if stuck closed--can be
> bypassed if temporarily just so you can have
> heat)

> That in turn, opens the air intake door. The
> vacuums activates the mode door for heating
> and outside air flows into the heater core.
> The activation of the heater core is through
> a vacuum operated water ****. Heat is
> discharged in the opening above occupants
> feet.

> Since only cold air is blowing thru the
> center vents--check your vacuum hoses--and
> especially the magnetic valve(its about the
> size of a roll of lifesavers) and there is 2
> identical ones near the plastic vacuum
> bottle.

> Good luck--and if you need the darn
> schematic, I'll scan it and put it up on my
> web page.

> Chung
Hey! Twills made some really good points, and I know that Travis knows his stuff also, so either one of them are good sources, although, I have a much simpler and more to the point solution, but there is one thing, this will only HALF way solve your problem, but my suggestion is, since you dont need the A/C anyways, just disconnect the belt from the A/C pump, and take out the pulley, so that all that's left is the a/c pump with no belt or pulley to get in the way of the fan or anything, to get to the a/c belt, you first have to loosen the altenator adjustment bolt, loosen that belt, take it off, then loosen up the a/c belt, and guide it around the fan to get it off...then back the long bolt out all the way, as if you still needed to loosen up the a/c belt, until it comes out of the hub that the pulley spins on, and of course take off the lock nut on the front of the pulley, wallah, everything comes out, guide your altenator belt back around the fan, put it in the correct grooves, pull the altenator back, tighten down that bolt, and bam...no more a/c will blow! It's not as hard to do as this explanation is long...anyone that has ever changed a set of belts can do this..sorry though, I can't help you with bringing really warm air into the car though, good luck!
 

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Discussion Starter #7
> Hey! Twills made some really good points,
> and I know that Travis knows his stuff also,
> so either one of them are good sources,
> although, I have a much simpler and more to
> the point solution, but there is one thing,
> this will only HALF way solve your problem,
> but my suggestion is, since you dont need
> the A/C anyways, just disconnect the belt
> from the A/C pump, and take out the pulley,
> so that all that's left is the a/c pump with
> no belt or pulley to get in the way of the
> fan or anything, to get to the a/c belt, you
> first have to loosen the altenator
> adjustment bolt, loosen that belt, take it
> off, then loosen up the a/c belt, and guide
> it around the fan to get it off...then back
> the long bolt out all the way, as if you
> still needed to loosen up the a/c belt,
> until it comes out of the hub that the
> pulley spins on, and of course take off the
> lock nut on the front of the pulley, wallah,
> everything comes out, guide your altenator
> belt back around the fan, put it in the
> correct grooves, pull the altenator back,
> tighten down that bolt, and bam...no more
> a/c will blow! It's not as hard to do as
> this explanation is long...anyone that has
> ever changed a set of belts can do
> this..sorry though, I can't help you with
> bringing really warm air into the car
> though, good luck!

I had the same problem in my '77 280. A fellow named Don suggested taking the vacuum hose as it comss out of the firewall and stick it right to the vacuum tube on the intake manifold, boom instant heat. Hope it works for you
Charlie K
 

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Re:To Chung

> Hey man can you scan the schematic of the vaccum lines for the rest of us that need it? If its not a pain.
Thanks
Craig
C.M.G. 76Z
 

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Re:To Chung

> Thanks
> Craig
> C.M.G. 76Z

I have scanned a diagram of the heater from my 260Z. The other years may vary--but the idea should be the same.

For eight balls problem--if the heater core is not the problem(or leaking--he'd know it if it was--) I'd check that vacuum source magnet valve and vacuum ****.
 

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Discussion Starter #11
Its the air distribution flap not opening.

> I am having the same problem. Heater hoses
> connected but air only comes out of center
> vent. 1973 Z Thanks in advance

Your air distribution flap is not opening under vacume. It determines which way the air passes...eg. through the heater core or the a/c coils....check your vacume lines on the drivers side under the dash....-Travis 77z
 

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> I have no doubt that Travis will help you,
> but I am going to suggest a completely
> different idea: park the Z for the winter
> and drive a POS like an Escort, Buick or
> something cheap and already rusteaten. My
> logic: 1) the Z was not one of the better
> rustproofed cars, the salt will eat thru the
> metal real quick, unless you have a VERY
> good rustproof job. 2) why risk a great car
> to the potential of another nincompoop's
> poor driving and smashing into your Z? 3)
> I've never driven a Z in the snow, but most
> high performance cars tend to be not-so-good
> in slippery conditions (high torque, fat
> tires, and all that). BTW I did live in Pa.
> for 35 years, so I am familiar with
> snow/winter condidtions.
> Or you could move out to Southern California
> or Arizona where you have to go to the snow
> on purpose. Good luck

Hehe Southern Calfornia I live there and I got 6 in of snow.
 

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Discussion Starter #13
Re: I'M FREEZIN MY NUTS OFF!!! Thanks guys.

Travis, Hey again. The heater core's connected. I haven't checked it myself but a couple weeks ago a guy I work with stuck his hand under the dash, near the flap and said he felt warm air down there. I havn't driven the car in a couple days because I've got the exact same problem described by phantom. Black smoke, fouled plugs, too much gas, temperature sensor, etc. I'm going to drive it to work tomorrow, leave it at the shop and work on both problems saturday. Between you and Chung, I'm sure I'll have some heat for Saturday night. Thanks A Bunch Guys. I'll let you know how it turns out.
 
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