If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
1998 Mustang A/C Problem! Help!
OK... here goes (I apologize for the length of this post)
1. Last fall I washed the engine on my 1998 3.8L v6 Mustang using the usual engine cleaning foam. When finished I noticed air no longer blew from the ac/heater vents but only from the defrost vents. I poked around and discovered a vacuum hose was disconnected. I reconnected and worked fine for a month or so. 2. Next thing to happen was the ac/heat thermostat knob became slightly difficult to turn to the ac side. Turns easily to the heat side. It feels like some type of spring or cable attached to the knob is damaged, worn, or out of adjustment. I haven’t torn the dash open to find out. 3. A few months later I could no longer get cold air from the ac. Air blows from the vents but never gets cold. Heater works fine. Took to a mechanic to check refrigerant level. He said refrigerant was fine. He jumpered the ac compressor directly forcing it to come on. He said the problem was the ac compressor was not getting power. He wanted to charge me to replace entire HVAC system ($900.00+). I told him I’d think about it (meaning "are you crazy?!") 4. I did some research and heard about the ac clutch switch (on condensor) sometimes failing and therefore not allowing ac compressor to kick in. 5. Took a paper clip and jumpered the ac clutch switch contacts (on the plug going to the switch on the condensor) and sure enough the ac compressor seemed to come on (did this with car running). Went out and bought a new switch and installed. Now here is what happens... When I turn on the AC (normal or max) the compressor seems to kick in only for about 2 seconds then turns off. I hear the engine RPM’s slow down (and see it on the RPM dash gauge) then the RPM’s go back to what they were before turning on AC. A few seconds later the RPM’s go down then back up. I turn off the AC and the RPM’s stay steady. As far as I can tell the ac compressor is not on long enough for the air to get cool (assuming the air would get cool). Do I simply need to add refrigerant to fix the compressor "quick cycling"? :cry: Thanks! |
Ads |
#2
|
|||
|
|||
1998 Mustang A/C Problem! Help!
bluefish2007 wrote:
> OK... here goes (I apologize for the length of this post) > > 1. Last fall I washed the engine on my 1998 3.8L v6 Mustang using the > usual > engine cleaning foam. > > When finished I noticed air no longer blew from the ac/heater vents > but only > from the defrost vents. I poked around and discovered a vacuum hose > was > disconnected. I reconnected and worked fine for a month or so. > > 2. Next thing to happen was the ac/heat thermostat knob became > slightly difficult to turn to the ac side. Turns easily to the heat > side. It feels like some type of spring or cable attached to the knob > is damaged, worn, or out of adjustment. > > I haven’t torn the dash open to find out. > > 3. A few months later I could no longer get cold air from the ac. > > Air blows from the vents but never gets cold. Heater works fine. > > Took to a mechanic to check refrigerant level. He said refrigerant was > fine. > He jumpered the ac compressor directly forcing it to come on. > He said the problem was the ac compressor was not getting power. > > He wanted to charge me to replace entire HVAC system ($900.00+). > > I told him I’d think about it (meaning "are you crazy?!") > > 4. I did some research and heard about the ac clutch switch (on > condensor) sometimes failing and therefore not allowing ac compressor > to kick in. > > 5. Took a paper clip and jumpered the ac clutch switch contacts (on > the plug going to the switch on the condensor) and sure enough the ac > compressor seemed to come on (did this with car running). > > Went out and bought a new switch and installed. > > Now here is what happens... > > When I turn on the AC (normal or max) the compressor seems to kick in > only for about 2 seconds then turns off. I hear the engine RPM’s slow > down (and see it on the RPM dash gauge) then the RPM’s go back to what > they were before turning on AC. > > A few seconds later the RPM’s go down then back up. > > I turn off the AC and the RPM’s stay steady. > > As far as I can tell the ac compressor is not on long enough for the > air to get cool (assuming the air would get cool). > > Do I simply need to add refrigerant to fix the compressor "quick > cycling"? > > :cry: > > Thanks! How cold is the outside temp? I don't know the first year for this, but Ford put a cold cut-off on mine and it doesn't engage the compressor in temps. under 50 or so. -- Tropic Green Y2K Mustang GT W/bits & pieces http://tinyurl.com/yjdb66 |
#3
|
|||
|
|||
1998 Mustang A/C Problem! Help!
"GILL" > wrote in message . .. bluefish2007 wrote: > OK... here goes (I apologize for the length of this post) > > 1. Last fall I washed the engine on my 1998 3.8L v6 Mustang using the > usual engine cleaning foam. > > When finished I noticed air no longer blew from the ac/heater vents > but only > from the defrost vents. I poked around and discovered a vacuum hose > was disconnected. I reconnected and worked fine for a month or so. > > 2. Next thing to happen was the ac/heat thermostat knob became > slightly difficult to turn to the ac side. Turns easily to the heat > side. It feels like some type of spring or cable attached to the knob > is damaged, worn, or out of adjustment. > > I haven’t torn the dash open to find out. > > 3. A few months later I could no longer get cold air from the ac. > > Air blows from the vents but never gets cold. Heater works fine. > > Took to a mechanic to check refrigerant level. He said refrigerant was > fine. > He jumpered the ac compressor directly forcing it to come on. > He said the problem was the ac compressor was not getting power. > > He wanted to charge me to replace entire HVAC system ($900.00+). > > I told him I’d think about it (meaning "are you crazy?!") > 4. I did some research and heard about the ac clutch switch (on > condensor) sometimes failing and therefore not allowing ac compressor > to kick in. > > 5. Took a paper clip and jumpered the ac clutch switch contacts (on > the plug going to the switch on the condensor) and sure enough the ac > compressor seemed to come on (did this with car running). > > Went out and bought a new switch and installed. > > Now here is what happens... > When I turn on the AC (normal or max) the compressor seems to kick in > only for about 2 seconds then turns off. I hear the engine RPM’s slow > down (and see it on the RPM dash gauge) then the RPM’s go back to what > they were before turning on AC. > > A few seconds later the RPM’s go down then back up. > I turn off the AC and the RPM’s stay steady. > > As far as I can tell the ac compressor is not on long enough for the > air to get cool (assuming the air would get cool). > > Do I simply need to add refrigerant to fix the compressor "quick > cycling"? > :cry: > Thanks! How cold is the outside temp? I don't know the first year for this, but Ford put a cold cut-off on mine and it doesn't engage the compressor in temps. under 50 or so. -- Tropic Green Y2K Mustang GT W/bits & pieces http://tinyurl.com/yjdb66 as this happened over time are you sure your refrigerant is still topped off? quick cycling is one sign of low pressure. When you cleaned the engine did you damage the WOT relay or get it excessively wet? Get under the dash and make sure the heater blend door is operating correctly. there are sensors under the dash that effect the operation of the ac system also. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
1998 Mustang Key Code | [email protected] | Ford Mustang | 0 | November 7th 06 08:40 PM |
My 1998 Mustang GT Won't Start! | [email protected] | Ford Mustang | 1 | April 14th 06 12:51 AM |
1998 Mustang GT won't start | tmb202 | Ford Mustang | 5 | August 28th 05 12:47 PM |
flasher location? 1998 Mustang | KK | Ford Mustang | 2 | July 24th 05 08:08 AM |
Throttle adjustment on a 1998 3.8L Mustang | tarzan | Ford Mustang | 0 | July 13th 05 02:28 AM |