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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

My a/c sucks

  • Thread starter Thread starter GTvert01
  • Start date Start date Jun 1, 2004

GTvert01

New Member
Nov 24, 2003
636
0
0
West Plains, MO
Jun 1, 2004
#1
  • Jun 1, 2004
  • #1
My a/c and heater will only work on low and high now.Any ideas? Kind of hard to get the right temp with only two options.

Brandon
 

SilverStallion

Founding Member
Mar 26, 2000
735
0
0
Ontario, Canada
Jun 1, 2004
#2
  • Jun 1, 2004
  • #2
Mine does not work at all this year. I heard some where that there is a process that you should go through when you first use the a/c each season...I can't recall what that was.

Anyone know???
~Darren
 

5.0's 4 ever

The #1 Stunna
Founding Member
Jan 22, 2000
5,794
0
76
Orlando, FL
Jun 1, 2004
#3
  • Jun 1, 2004
  • #3
GTvert01 said:
My a/c and heater will only work on low and high now.Any ideas? Kind of hard to get the right temp with only two options.

Brandon
Click to expand...

Are you saying the blower fan will only work in speed 1 and 4? If that is the case sounds like a fan control switch, when the blower motor resistor goes you are left with only the highest speed(4). Now if your fan is only working in the high setting(4) I would replace the blower fan motor resistor.
 

5.0's 4 ever

The #1 Stunna
Founding Member
Jan 22, 2000
5,794
0
76
Orlando, FL
Jun 1, 2004
#4
  • Jun 1, 2004
  • #4
SilverStallion said:
Mine does not work at all this year. I heard some where that there is a process that you should go through when you first use the a/c each season...I can't recall what that was.

Anyone know???
~Darren
Click to expand...

I would check to see what kind of pressures you have in your ac system. Low freon and too high of pressures like a blockage in the system will cause the AC to not work also.

I just went through this with my 96 cobra. I had not driven the car in over 5 months while it was down for the engine work. My AC compressor would not come on at all. My pressures were extremely high, I ended up flushing my AC condensor to remove the blockage. Pressures went down to normal and the AC works perfectly now.
 

Smeech

Member
Feb 28, 2004
148
1
16
Fremont, Ca
Jun 1, 2004
#5
  • Jun 1, 2004
  • #5
My old car had a similiar problem: ac would work on 1 and 2, fan would only work on 3 and 4... it was the fan relay, there were a couple cracks in two coils (act as resistors, determine fan speed) I got some magnet wire from radioshack and remade the coils, worked great...

But I'm not sure about the Mustang..
 
6

68 & 00 GT

New Member
May 14, 2003
2,407
1
0
HOUSTON TEXAS
Jun 1, 2004
#6
  • Jun 1, 2004
  • #6
reminds me I really need to add some R134-A
 

reeber

10 Year Member
Mar 10, 2004
574
26
38
Berlin, NJ
Jun 1, 2004
#7
  • Jun 1, 2004
  • #7
Thats o.k., no matter where I turn my switch to, it only comes out of the defroster. If I want the air vents to blow, nope, defrosters.. Anyone have this problem?
 

5.0's 4 ever

The #1 Stunna
Founding Member
Jan 22, 2000
5,794
0
76
Orlando, FL
Jun 2, 2004
#8
  • Jun 2, 2004
  • #8
reeber said:
Thats o.k., no matter where I turn my switch to, it only comes out of the defroster. If I want the air vents to blow, nope, defrosters.. Anyone have this problem?
Click to expand...

Sounds like you have a vacuum problem. When the HVAC system recieves no vacuum it will default to defrost. I would check to see if your vacuum supply line from the engine bay is still hooked up with the vacuum harness.
 
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