Air blowing warm in 2001 dodge dakota

Do the tests in this post

http://ricksfreeautorepairadvice.com/heat-load-test-thermostatic-expansion-valve-system/

clutch on pump could be bad

Is the compressor cutting out? It could be the compressor clutch relay is going bad.

If you are handy, yes you can. Most likely causes are loss of freon which would prevent the compressor clutch from being engaged and operating the compressor, a lack of 12 volts being applied to the compressor clutch because the a/c compressor fuse or relay has failed, preventing the clutch from engaging the compressor, or the compressor clutch itself failing. Easy test is to watch the compressor pulley with the motor running. The pulley will, of course be spinning, but the circular assembly mounted to the front of the pulley will spin with the pulley only when the compressor is engaged. There is a sensor mounted to the a/c line that prevents the clutch from engaging the compressor if there in not enough freon in the system. You could go to auto zone or checker and buy a can of freon r-134 with a hose for around $15.00. It is fairly easy to follow the instructions to charge the system. If, after allowing some of the can to pressurize the system, the compressor clutch engages then you can continue to charge the system. Cold air should start to blow by the time the can is empty. Or you can locate the a/c relay located in the fuse panel, remove its plastic cover and manually close the contacts while observing the compressor pulley assembly. If the clutch doesn't engage then the problem in probably electrical, a fuse, the relay or the electric clutch itself. Go to auto zone and check you their dvd on a/c repair for under $9.00. Hope this helps! Dano

if the compressor works and your freon is charged it may be the blower flapper door....disconnect battery for 10 minutes and then re-connect to reset the electronics that control the flapper

SOUNDS LIKE YOU HAVE A BAD RELAY COMPRESOR RELAY

A couple of ways to find out what, exactly, is wrong. One start your van and look under the hood. If you turn you A/C both pullies on your Compressor should be turning. If they are your second option lies in the systems charge. If you locate the aluminum lines for your A/C system you can unscrew the cap and push the valve down (Very gently) with a screwdriver or even a nail. If nothing comes out you need to buy R-134 Freon and charge your system. Hope this helps.

Your system has R-134 Freon in it. the 134 is made up of smaller molecules than the old R-12. The R -134 permeates through the rubber parts of the system. If the system gets too low on Freon, the compressor will stop coming on.(low pressure cut out switch). Have the system serviced with an A.C. machine that can vacuum, measure the amount of Freon in the system, and add the right amount. The machine can also inject die. Later the die will show up under a black light.This will show any leaks you may have.

Your vehicle has the R-134 system. These systems usually don't have a charge site glass window. Just because the compressor turns doesn't mean the system is full. You need to hook up the hi and lo side of the system to evaluate the systems operation. Too much R134 will adversely affect the performance of the system producing warm air. You could have a bad expansion valve contributing to the systems malfunction. You can find the problem by hooking system to a set of manifold gages.

Either you are out of coolent or the compressor is not working.

First check the fuses, then lift the hood and have a friend turn the air on. The compressor should cycle, if not take it to a mechanic. If it does cycle you are low on freon, take it to a mechanic for a system charge. Make sure they check for leaks first.