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  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech

air coming thru vents..... hot air!!

  • Thread starter Thread starter Stang_1973
  • Start date Start date Jul 27, 2009

Stang_1973

Founding Member
Jul 13, 2001
565
9
38
San Antonio, Tx.
Jul 27, 2009
#1
  • Jul 27, 2009
  • #1
Ok well ive always had this problem just neve got around to fixing it.

The car originally came with AC however all the parts for ac are gone except for the controler in the dash and miscellaneous parts under the hood. theres no hosing or compressor. Anyway. as I drive the car air comes into the cab thru the dash vents and what seems to be the floor vents as well. Even when you put the controller in the off position air comes in. If you turn on the raise the fan setting it blows harder. Now the problem is that this air is frekin HOT!!! and with temps in the high 90's low 100s here in san antonio this is very stressing. I dont know if its air coming from the engine bay, or coming thru the cowl, passing thru the heater core and then coming thru the vents. ive cheked to make sure the flap for the heater core closes and it does but the air si still fricken hot! How can i check to make sure the controler is closing the vents? is there an way to close them mannually?
 
C

Calponycarsmike

New Member
Jan 22, 2009
71
0
0
Southern California
www.calponycars.com
Jul 27, 2009
#2
  • Jul 27, 2009
  • #2
I would check under the dash to see if the vents are closing all the way, sometimes the cables can get loose and not close it all the way, also depending on what is missing from your A/C system you could be drawing in hot air from the engine compartment. While you are down there check the seals on the vent doors. It is a pain rooting around under the dash, but it is your only option.
 

Stang_1973

Founding Member
Jul 13, 2001
565
9
38
San Antonio, Tx.
Jul 27, 2009
#3
  • Jul 27, 2009
  • #3
How would I know if its drawing from the engine compartment? Thats what im afraid of, as the air is extremely hot.
 

jcode68

Active Member
Jul 15, 2003
892
1
29
Massachussetts
www.cardomain.com
Jul 27, 2009
#4
  • Jul 27, 2009
  • #4
It's probably just leaking from the vents and the reason the air is hot is from the heater core. Mine does this too, but doesn't sound as bad as yours. I have seen people put shut off valves in the heater hose to shut the water flow going into the heater core during summer months. Do a search and you might be able to find a picture of this setup.
 

Stang_1973

Founding Member
Jul 13, 2001
565
9
38
San Antonio, Tx.
Jul 27, 2009
#5
  • Jul 27, 2009
  • #5
Ah i see.. thanks.
 

Platonic Solid

Founding Member
May 29, 2002
1,960
5
39
CT-USA
Jul 27, 2009
#6
  • Jul 27, 2009
  • #6
If your car had A/C at one time, you should have a vacuum actuated shut-off valve in the right heater core feed hose near the firewall.
 

Stang_1973

Founding Member
Jul 13, 2001
565
9
38
San Antonio, Tx.
Jul 28, 2009
#7
  • Jul 28, 2009
  • #7
I know for a fact that i do not have that. I saw something like that researching on the web to find a soloution to my problem. Now here goes, if i pick up one of these valves from the parts store, how does it go in? I have no idea how i would hook up the vacuum line...
 
2

2+2GT

10 Year Member
Apr 25, 2009
3,333
10
79
Southeastern Pennsylvania
Jul 28, 2009
#8
  • Jul 28, 2009
  • #8
Stang_1973 said:
I know for a fact that i do not have that. I saw something like that researching on the web to find a soloution to my problem. Now here goes, if i pick up one of these valves from the parts store, how does it go in? I have no idea how i would hook up the vacuum line...
Click to expand...

The heater shut-off valve splices into the heater hose that comes from the intake manifold to the firewall, about at the back end of the valve cover. We should be able to find you the vacuum diagram to hook this up so it operates properly. The vacuum motors under the dash should not be circulating air unless you have set the controls to do so. Hot air should NOT be coming from the engine compartment unless someone has hacked holes.
 

Platonic Solid

Founding Member
May 29, 2002
1,960
5
39
CT-USA
Jul 28, 2009
#9
  • Jul 28, 2009
  • #9
Here's what mine looks like:





Here's where the vacuum hose exits the firewall to the heater control valve:

 
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