mtsumedi

I have a 93 V6 4x4 with a 92 engine. The AC stuff is all 93. The AC worked flawlessly and was very cold at first and now it seems to cut in and out. When it works, it works good and blows very cold. It seems to want to cut out at random times.

Facts:
The AC light comes on when the button is pressed.
When I feel it blowing warm air, I check and the compressor is not even coming on (RPM doesn't change when I push the button on and off).
Next thing you know, it works fine.

Anyone have any insight?

I hate cars.

EDIT: Oh yeah, it's been pissing a lot of water lately. Don't know if it's the Florida humidity though.

whitetaco02

could be the expansion valve. I had to replace that on my 88.

86SR522REEFI

the clutch might not be engaging.

mtsumedi

Seems like it does ok when I am driving down the road.

rezrunner92

When I called about the steering link rod last week, the lady said there was a recall on the expansion valve also. She said make sure the syatem would hold pressure then bring it in and they would do both recalls and charge the airconditioner.

HAVOC

Over charged, evap. freezing up, bad expansion valve?

mtsumedi

That's good info. Thanks.

mudbutt

An expansion valve will not keep the A/C from turning on. Also Your A/C charge once low will not turn the low pressure switch on and off.

89dlx said freezing, this could be if it happens on long trips. The A/C performance will get warmer and you will notice that your vent air outlet will be less flow.

The Clutch failing is a possible cause, you might me at the maximum air gap for the magnetic clutch to engauge. This might cause an intermintant operation.

Does this happen at idle? if it does you idle speed could be too low. Or, your idle speed cutout could be set too high. This is adjusted but the black Knob on the A/C amplifier.

Do you have an automatic? The autos have a overtemp cutout, if your running hot his will shut off the A/C. I don't rember enough about this circut. I'll have to look more on monday at work.

Intermintant problems I would suspect somthing electrical related not A/C charge/mechanical related.

Edit: I just saw the pissing water comment, does your vent flow decrease (airflow)?

mtsumedi

I did notice the temp gauge was a little higher than normal. Not nuch though. I was playingin the dirt a little but once I got out on the main road, the AC blew cold and it was all good.

On a side note, my temp gauge does flutter around when I am under throttle. Just started doing that recently.

mt_goat

Yeah my AC shop just bypassed this for me. On the auto tranny models there is a relay behind the glove box for the overtemp cutout. The relay can be bypassed, but if your's is shuting off because you are overheating that wouldn't be a good idea.

mtsumedi

Oh yeah, it is an auto.

The truck doesn't seem to be overheating though. I need to get a different gauge that shows an actual temp.

mt_goat

Yeah these factory temp gauges are really just a hair better than an idiot light. The needle will stay stuck smack dab in the middle of the gauge through a big range of temps.

mtsumedi

Okay, the AC worked most of the day. This evening it started cutting off on me though. I kept a clsoe eye on the temp guage and it normally rides right below the center mark. Well, once it got up to about half the AC compressor stopped working and the truck got warm. This is under normal ass driving conditions. In fact, it only happened after dark and not in the dea heat of the day.

Recently I changed out the water pump and thermostat and I know the coolant level has been fine. There are no traces of any leaks at all.

Could my radiator fan clutch be taking a ลลลล? It seems to have been making a kind of weird noise lately that's like that sound where you spin a tire and the scuffing noise from where the brake pads just slightly rub the rotor.

mtsumedi

Anyone know about those ffan clutches?