A/C acting up.
Thread Starter
Joined: Oct 2007
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A/C acting up.
a/c blows cold air then hot air then cold air then hot air with the temp. control **** all the way on cold.
Also there is this groaning sound coming from under the dash.
any body have any ideas what causes this to happen.
Also there is this groaning sound coming from under the dash.
any body have any ideas what causes this to happen.
Joined: Sep 2007
Posts: 1
Likes: 0
RE: A/C acting up.
its probably your evaporator. thats a common problem on most dodges. the same thing happened to my 1999 ram. i just went to a friends house today and checked for freon leaks and of course it was coming from the evaporator. its probably going to cost you 800 dollars to fix it so it will probably be better just to ride with your windows open.
Legend
Joined: Jul 2007
Posts: 7,843
Likes: 13
From: DFW, Texas
RE: A/C acting up.
There's something you can try that might save you the evap fix.
IF the leak isn't horrible, try something called Red Angel. They sell it at NAPA. It's $35 a bottle and you'll need a dye injector to install it. It can plug small leaks and it might just save you the high cost of pulling the dash to repair the evap canister.
IF the leak isn't horrible, try something called Red Angel. They sell it at NAPA. It's $35 a bottle and you'll need a dye injector to install it. It can plug small leaks and it might just save you the high cost of pulling the dash to repair the evap canister.
Thread Starter
Joined: Oct 2007
Posts: 6
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From:
RE: A/C acting up.
today i put a water cutoff valve in the heater hose to stop water to the evaporator, a/c blows good & cold now just dont have heat!
May be there is a problem with the thermostat/ temp control in the dash?
May be there is a problem with the thermostat/ temp control in the dash?
Captain
Joined: May 2007
Posts: 601
Likes: 3
From: Clearwater, FL
RE: A/C acting up.
STOP! Well done! You were ABSOLUTELY CORRECT to cut the heater supply to test the a/c and you found that the a/c still blows cold. It can't blow cold one minute and hot the next and then back to cold on a low charge. In the case of a leak in the a/c system, it would just gradually (depending on leak size) blow less cold, then no cool at all. BUT it would not blow HOT air at you.
It's not your evaporator or your heater core gone south. It is the blend door in the HVAC plenum box. It has either come disconnected (cable to the elec. motor) causing the door to fluctuate inside the box and thus heat and cool at various times. Or the motor controlling the the door has an itermittant fault. It's probably getting bound up a little too and that is where the "groan" is coming from. That is where your repair will be.
NEVER, NEVER, NEVER add any sort of stop leak to an a/c system, especially these Dodges. They operate on an orifice tube metering system. What that means is the refrigerant is metered through a tiny (smaller than the POINT of a pin) hole. Think of it. If a stop leak product would block up a pressurized leak in say an evaporator coil, just imagine what it would do to that metering tube! If anyone here has ever added a stop leak to their system, when you finally go to the a/c mechanic, (and you will, or do without a/c) PLEASE inform them of this so they don't contaminate and possibly destroy their recovery/charge equipment. Some of the contents of a few of these products is even flamable and could start a fire or explosion if impacted and released during a crash.
WC
It's not your evaporator or your heater core gone south. It is the blend door in the HVAC plenum box. It has either come disconnected (cable to the elec. motor) causing the door to fluctuate inside the box and thus heat and cool at various times. Or the motor controlling the the door has an itermittant fault. It's probably getting bound up a little too and that is where the "groan" is coming from. That is where your repair will be.
NEVER, NEVER, NEVER add any sort of stop leak to an a/c system, especially these Dodges. They operate on an orifice tube metering system. What that means is the refrigerant is metered through a tiny (smaller than the POINT of a pin) hole. Think of it. If a stop leak product would block up a pressurized leak in say an evaporator coil, just imagine what it would do to that metering tube! If anyone here has ever added a stop leak to their system, when you finally go to the a/c mechanic, (and you will, or do without a/c) PLEASE inform them of this so they don't contaminate and possibly destroy their recovery/charge equipment. Some of the contents of a few of these products is even flamable and could start a fire or explosion if impacted and released during a crash.
WC
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Legend
Joined: Jul 2007
Posts: 7,843
Likes: 13
From: DFW, Texas
RE: A/C acting up.
ORIGINAL: WayneC
NEVER, NEVER, NEVER add any sort of stop leak to an a/c system, especially these Dodges. They operate on an orifice tube metering system. What that means is the refrigerant is metered through a tiny (smaller than the POINT of a pin) hole. Think of it. If a stop leak product would block up a pressurized leak in say an evaporator coil, just imagine what it would do to that metering tube! If anyone here has ever added a stop leak to their system, when you finally go to the a/c mechanic, (and you will, or do without a/c) PLEASE inform them of this so they don't contaminate and possibly destroy their recovery/charge equipment. Some of the contents of a few of these products is even flamable and could start a fire or explosion if impacted and released during a crash.
WC
NEVER, NEVER, NEVER add any sort of stop leak to an a/c system, especially these Dodges. They operate on an orifice tube metering system. What that means is the refrigerant is metered through a tiny (smaller than the POINT of a pin) hole. Think of it. If a stop leak product would block up a pressurized leak in say an evaporator coil, just imagine what it would do to that metering tube! If anyone here has ever added a stop leak to their system, when you finally go to the a/c mechanic, (and you will, or do without a/c) PLEASE inform them of this so they don't contaminate and possibly destroy their recovery/charge equipment. Some of the contents of a few of these products is even flamable and could start a fire or explosion if impacted and released during a crash.
WC
