[IhaveadopeGT]

I hope this is the correct section for this, if not I apologize in advance I didn't know where else to really post this.

So at 1:00pm today in the blazing 91 degree Texas sun my a/c decides to blow extreme heat at me. There was no change, symptom worked like this. Turned A/C on, it blew cold for 1-2 seconds....HEAT....blazing hot heat. I have used the heater very rarely this past week and have switched between heat/air conditioning since this has happend. As a matter of fact, I used my a/c last night/sunday morning at 1:00am driving home from a friends house. Then boom, 12 hours later, she's pushing blazin heat at me.
I am a very adament DIY person, although I know there are some things I most likely, should take to a professional. Albeit the fact I have a little but of money in my wallet at the moment, it is mainly intended for my girlfriends family visit in three weeks. I would like to avoid any serious/major fund hurting repairs till next spring if possible.

So far, I have recharged the system(at Autozone in the parking lot) at the valve closest to the charcoal canister/evaporator?(it is on the high side on the passanger side in the engine bay I can take a photo if needed). I am not 100% certain this is the actual fill valve for the a/c. I certainly hope it is because that's what I used to attempt to recharge her today. I added approx 31oz of 134-a from a recharge kit(entirely full system should be 33oz according to my research).
This made no difference in the a/c system still blows HOT air.

I drove home and checked my fuzes, number 23 and 24 under the dash are for climate control and a/c system. Both fuzes are fine. Although I contemplated replacing them, it's obvious the unit works, you can hear the compressor clutch kick over when you turn on the a/c system and air does blow through the vents. My only concern, when I played with the cold/hot air control knob i heard the compressor make a funny noise but it only happened twice(and I played with the damn thing A LOT today hoping to get it to work).

So my fellow Mustang owners, I call upon you all to advice with your experiences and expertise to please help what to check next. I would love to get this thing working without going to someone, however if I have to....well...next spring it will be fixed(no way I am going to survive a summer in Texas with no a/c...although the thought of doing an a/c elimination to gain some lost hp did cross my mind).

Thanks all for reading my long post, please, help your boy out, TEXAS IS HOT!?!?!?!

Best Regards,

Eli

[2000MustangGT]

mabey theres a leak or somethin, my car was blowin warm air in and i put some freon and some umm...umm...sealer or somethin i cant even remember now. but anyways its blowin extremly cold almost colder than my fridge

[450hp69coupe]

to me sounds like the blend door motor quit kinda common in the fords ..you said you recharged it did you empty it first if not it will not turn on if too full also if you can get your hands on some gages it will also help in figuring this problem i hope some if not all of this helps

[01GTdarknessss]

one thing to check, happened to me a couple months ago...first off, is the temperature mixing dial on the dash turning freely? with switching back and forth, the little gear-equipped "mixing wheel" behind the a/c controls and radio may have come loose. if you pull the a/c panel and radio after first pulling the trim panel of course, the temp mixing dial is connected by a line-operated hose that runs to a circular case with a gear inside of it that switches between hot and cold air. it sometimes comes loose from its fixed position on the firewall behind the dash. if this is the case for you then simply epoxy it back in place on the firewall and all should be good as new. by process of elimination it must be something with the mixing apparatus, whether it be what i just detailed or the mixing box itself. good luck fixing it, keep us posted

[IhaveadopeGT]

Originally Posted by 450hp69coupe

to me sounds like the blend door motor quit kinda common in the fords ..you said you recharged it did you empty it first if not it will not turn on if too full also if you can get your hands on some gages it will also help in figuring this problem i hope some if not all of this helps

I have a guage at home, I'll check it today, I'm pretty sure thats not the issue at this time. Any idea where the blend motor could be located? I suppose I should pick up a haynes or chiltons manual now. Especially if I am going to start ripping stuff apart.

Originally Posted by 01GTdarkness

one thing to check, happened to me a couple months ago...first off, is the temperature mixing dial on the dash turning freely? with switching back and forth, the little gear-equipped "mixing wheel" behind the a/c controls and radio may have come loose. if you pull the a/c panel and radio after first pulling the trim panel of course, the temp mixing dial is connected by a line-operated hose that runs to a circular case with a gear inside of it that switches between hot and cold air. it sometimes comes loose from its fixed position on the firewall behind the dash. if this is the case for you then simply epoxy it back in place on the firewall and all should be good as new. by process of elimination it must be something with the mixing apparatus, whether it be what i just detailed or the mixing box itself. good luck fixing it, keep us posted

That was my guess as well, I'm not entirely certain this is defective, but I'm willing to take it apart and check it out. The dial feels to be turning freely. My initial guess was that something came loose or broken and it is not changing the temp from hot to cold.

Pretty much trying to use process of elimination(basic troubleshooting lol). Although I did price a compressor last night just to get an idea. I still hope this is something basic I will be able to fix on my own. I'd like to get it repaired soon rather than next spring. The weather does go hot/cold on a daily basis in Texas, we are expecting low 90's all week. Early in the morning is cool enough to drive in comfort with no a/c but around 5:00pm it is blazin hot outside, then even hotter in my GT with black leather

[01GTdarknessss]

i hear ya man, mine decided to quit at 4pm on sunny day with about 90 degree temp....so i def feel ya on that one....good luck tho, i got problems of my own as of tonite, fixed my tranny mount bolts and then realized a front wheel bearing is going bad ....just a sidenote, my temp dial seemed to turn freely too, then all the sudden, hot air! it was actually my pops who suggested the mixing door was not moving, and sure as **** that was it.... guess old age doesnt make ya forget EVERYTHING!...hahaha (note to self: keep seemingly senial old guy around a little longer)....haha, dont know what i'd do without him

[racin366]

Make sure the compressor is actually kicking on, you'll see the clutch lock up and the 3 'knobs' on it will spin. The blend door is probably the issue, but definitely check with gauges, like above if it is overfilled it won't come on. Worst case, you could get a used compressor for around $100 or less at a salvage yard or ebay, swapping it is very easy, did mine in less than a half hour.

[IhaveadopeGT]

Originally Posted by 01GTdarknessss

i hear ya man, mine decided to quit at 4pm on sunny day with about 90 degree temp....so i def feel ya on that one....good luck tho, i got problems of my own as of tonite, fixed my tranny mount bolts and then realized a front wheel bearing is going bad ....just a sidenote, my temp dial seemed to turn freely too, then all the sudden, hot air! it was actually my pops who suggested the mixing door was not moving, and sure as **** that was it.... guess old age doesnt make ya forget EVERYTHING!...hahaha (note to self: keep seemingly senial old guy around a little longer)....haha, dont know what i'd do without him

Tried my dial last night, I didn't dig to deep into the dash I might try again in my free time. I'm still wrapping up the paint job on my Supra so my Garage is all clean and decontaminated right now. With the Supra being wrapped up for paint I can't exactly pull it out either. Good thing is I should be almost done and I can at least pull her out and put the GT in the garage to work on her in there.
I though my hot/cold switch was defective last night, I played with it and assumed I fixed it(the little metal knob on the shaft that attaches to the knob was forward not making contact with the plastics inside). The part is $8 at autozone, might swap it just to be safe.

Also, I did not watch the a/c compressor but this is what's happening now, I turned the system on to verify if the hot/cold dial was working, my compressor is making a grinding noise now when the a/c is on. Could it be over filled? I need to rent or borrow some a/c gages to check it out. the cheap one I have at home is plastic and when I hooked it up, it just leaked green stuff all over the place. I stopped it in time but didn't try again.

Old guys are good for something, make sure you keep him around. My father and I don't talk anymore, but when we were close he always helped me when I was stuck on something. Although he was long done and over with his hot rodding days when I had just started mine. When I was in a pinch, he helped me out, I couldn't believe he knew/knows so much.

Originally Posted by racin366

Make sure the compressor is actually kicking on, you'll see the clutch lock up and the 3 'knobs' on it will spin. The blend door is probably the issue, but definitely check with gauges, like above if it is overfilled it won't come on. Worst case, you could get a used compressor for around $100 or less at a salvage yard or ebay, swapping it is very easy, did mine in less than a half hour.

I'll have to check the compressor when I get the chance, time is tight right now with trying to finish the paint on the Supra. I figure the sooner I get done with my painting the sooner I get my garage space back. I already priced an a/c repair kit from ebay, comes with all new parts, warranty for 225 and 20 for shipping. If I need a compressor I will most likely get a kit like that and install as much of it on my own as possible and have an a/c tech refill the system.
I do want to give the blend door thing another shot and hope that it works. how far down the firewall do I have to go to get to the controls/blend door? I didn't pull the H/U out last night, just pulled the a/c controls out and hoped to find something wrong there. Again, time is tight with having to paint the Supra, So I only invested 30-45 minutes in the GT last night. At least she's running and nothing major is defective (knocking on wood).

[racin366]

With the noise you described it is possible its overfilled, do you smell anything? Sometimes when overfilled they will try to work and the clutch will slip, smells terrible. Sounds like the bearings are shot in it.
And yeah, keep the old fella around, I was fortunate enough to have a great relationship with my dad, and I always thought there was plenty of time. I learned the hard way that time is finite and tomorrow is promised to no one. Don't learn the hard way, it sucks.

[01GTdarknessss]

thanks for the words of wisdom about my pops guys, even after all the **** the two have put each other through, i wouldnt trade him for the world. he's made/making me the man i am/trying to be....the blend door gear operator is not so much down the firewall/dash as it is just deep in there. you def have to remove the head unit tho to get at it. it should be firmly attached to the interior side of the firewall in order to work properly. good luck, by the way i sympathize with the garage space issue, at my old house we had our 72 nova (i know, bowtie) in a 1 and a half car garage. could barely even get in and out of it to pull it out.