Blend door is not your problem.

You have a freon or pressure switch problem most likely.

Did you put gauges on the system? What were the readings?

Blindly adding freon is usually not a great idea.

 

did not put gauges on it. Was able to charge it up last Summer (AC Pro) and worked fine after that. Just tried the AC a couple weeks ago and ran into the problem.

I thought if the lines were frosting up, the system may be full and wondered if there was a different issue.

Thanks

 

The fan discharges into the evaporator coil. If air is flowing out of the vents, it's flowing through the evaporator.

If the blend door is stuck on full heat, then it is possible the cooled air is being re-heated. One way to test this is to disconnect the heater hoses and see if it cools down. Another way is to let the engine cool completely, start it and run max AC. If it starts blowing cold air and warms with the engine warming, then it could be the blend door.

Look down at the A/C clutch on the front of the compressor. Is it spinning? It should be. It should not cycle more than ten times per minute.

Feel the orifice tube, it should be icy cold. It's the skinnier of the two lines that go through the firewall, the one that does not go through the dryer.

You might have a plugged orifice tube, a bad pressure switch, low coolant, or worn out compressor (will not make enough pressure).

At the end of the day, you need to get a manifold gauge and look at the high and low side pressures.

Good luck.

 

One way to test this is to disconnect the heater hoses and see if it cools down.

What do you reckon is going to happen to the engine coolant when someone follows those directions literally?

At the end of the day, you need to get a manifold gauge and look at the high and low side pressures.

Along with a mop and a bucket.

 

thank you...will take a look at those other items and see. I may just need to take it to a shop and have them put the gauges to it

 

No reason to go to a shop, most auto parts stores will lend them to you. autozone, advanced auto, pepboys, ect....

 

Find a friend who has one of these: https://www.harborfreight.com/ac-r134a-manifold-gauge-set-62707.html

Then watch

 

Does your A/C behave the same on a hot day as it does on a mild day?

Mine works great when I don't really need it, but craps out on really hot days. I already had it in the AC shop last year for this problem & they drained some water out, applied a vacuum pump, then refilled the refrigerant. It works ok after that, but still craps out on really hot days.


Montego
98 Jeep Wrangler TJ