Question about 1998 Ford Mustang

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1998 Mustang A/C problem

The a/c only blows out outside air temperature. Freon is fine, Tried a new clutch brake on the A/C, but that did not work. Checked the voltage to the A/C and that is fine. Do you have any ideas? Please share.


Thanks

Mike - Louisville

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You need to check both low & high sides with a guage set---if there both the same pressures---about 100 psi---the compressor reed valves are not working properly & you need a compressor---ypu will need to also check the orphis tube to see if its clog

Posted on Jun 28, 2008

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I have freon, and there are no leaks and had a air compressor put in 2 years ago but my car is blowing hot air only


There are a few things that can cause this. First off, make sure that the compressor is turning on when you turn on the AC switch. With the AC on full blast, look at the engine, locate the compressor and make sure that the center hub (the clutch) is spinning, not just the pulley around it that the belt rides on.

If the clutch is not spinning, or if it cycles on and off repeatedly, then your AC compressor is not functioning properly. This could be due to a failed compressor or to a low level of freon in the system.

If the clutch is spinning, then the next thing you should check is your freon level, get a temperature-dependent basic freon gauge, (like the one I posted in the link at the bottom) hook it up, set the outside air temperature on the gauge and then it will show you the ideal freon pressure level. What most people do not know is that having too much freon in a system will cause it to blow just as warm as an under-filled system. The freon level has to be in the "sweet spot" for it to properly work.

If your freon is at the proper level and your AC clutch is on and functioning then it could possibly be the AC switch in your instrument panel, or one of a couple of different parts in the engine compartment, but 90 percent of the time the problem will be found within the bounds of what I just listed. Good luck!

http://www.autozone.com/autozone/accessories/Quest-R134a-recharge-hose-with-metal-gauge-handle?itemIdentifier=34657

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1 Answer

My air conditioner is blowing hot air. I have added 2 cans of freon? What else can I do?


is the evap canister cold? And is the pump turning on and of with the clutch on the ac pump? Also could be a electric motor that controls the flaps in the dash that control hot and cold. I have found that sometimes using the can freon will not put the pump in operating range for the ambient temp on the high and low side. There has to be a certain level on both sides that works with the outside temp!

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Hi - There may be 2 separate problems. On my 1991 Lincoln Town Car, there is a Thermal Blower Lockout sensor that disables the heater from blowing until the engine temperature reaches a specific temperature. This way if you have vent or floor settings and 90 degrees set and it is winter, you won't get blasted with cold air. When the vehicle warms up, the TBL circuit enables the climate control to blow the hot air. If you use the flr/def instead of the floor or vent control, the TBL should not prevent the heater from working even with a cold engine. On my car, the TBL went bad and always prevented hot air from blowing on the floor and vent settings, even when the engine was hot. Another thing to check is a thermal limitor resistor. It is designed to cut off the blower at very hot temperatures, except if the blower fan is in the hi setting.

As far as the A/C is concerned, can you verify if the clutch is engaging or not? A rapid cycling of the clutch is an indication of low freon. If you are absolutely sure that you are fully charged on freon, I think there are 2 possible causes: (1) Bad pressure switch on the accumulator is indicating low freon that is telling the compressor not to work; (2) a blocked orifice tube.

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1 Answer

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Is the system low on Freon? If not, you most likely have a bad A/C compressor, or a bad low pressure switch.

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first thing to do before you charge it again replace the 'O' rings in back of the compressor also add some a/c oil because that will help the a/c compressor not to rattle this is the way I do mine I put in a can of 134A first and after that I put in the 134A oil and then I put in the rest of the 134A that is needed
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You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.

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Sounds like you have a freon leak somewhere. No gas or low gas in the system will not let the clutch kick in. Have it check out professionally, unless you know what you are doing in terms of low side and high side pressure check. The latter can be dangerous if you are not familiar with the procedure, if you connect the freon or the 134 can to the wrong nozzle, the can can blow up.

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