air cond. on 93 taurus

sitting on zero(cold) and its a 3.0 not a 3.8, thanks anyway....

Do you have manual or automatic climate control? The service manual list: dirty contacts clutch cycling switch poor connection A/c clutch connector clutch cycling switch connector A/C cutout by ECA (engine control assembly)

You need to see if there is 12 volts at the cut out switch and clutch connector with A/C on and go from there.

BOB

jim opined in news: snipped-for-privacy@noname.com:

Here's what can cause that condition:

Wide Open throttle - TPS

Engine Overheat - ECT

Either of those result in other symptoms... IDLE and/OR acceleration performance.

according to the trouble shooting Helm book you disconnet the harness to the TPS and see if it will now work??? did that and it still did not work... engine Overheat????--- engine ice cold in the morning...and still no go with the compressor..... thanks anyway....

-- thanks again, it sure would be alot easier to know whats inside the module... i had a 83 mustang and there was a module in the kick panel to cut off the a/c or let it come on?? the module was bad... took it off a pried it apart.. one of the internal wires were loose/bad solder joint.. at the time the part was $46 my discounted price from the dealer....in

1984 dollars... a little solder and it was fixed...was hoping it could be something like this.. a good int. module will proably cost me $150 or more and still might not be the problem...

Here is the signal flow:

12 volts at the A/C function switch assy. When you turn the A/C on it puts 12 volts on the line going to the A/C clutch cycling switch. (It seems your OK up to this point).

From the A/C cycling switch, the 12 volts goes to the ICM (integrated control module) mounted on top of the radiator. The relay in this module is what actually feeds the A/C clutch with

12 volts.

I will have to research this a little more, but i think there is a signal from the main computer (ECC) that has to be at the relay module along with the A/C clutch 12 volts to engage the relay. This info is off my 90 manual, but i think pin 21 of the ICM is the input from the A/C cycling switch, and pin 23 and 16 drive a A/C clutch.

So, you have one of two problems.

1) the IRC is bad 2) The signal from the ECU is not correct to engage the relay. This could be a bad ECU (not likely) or a sensor that is not in range telling the ECU to turn the clutch off (more likely if it has that capability)

I will see what else i can find. Can you find a used ICM to swap out and try? Have you checked the connector for corrosion? Checked the grounds and mounting of the ICM? Pull the top radiator shield off and check it out. (Disconnect the battery if you disconnect the ICM)

BOB

OK, a little more info. Pin 22 on the ICM is the Wide open throttle A/C cut-out switch. It comes from pin 54 on the ECC. This is the pin that if hot could cause the A/C clutch not to engage if every thing else is OK. If this is the case, the question is what sets WOT on the ECU? Is it the TPS, or another switch. More questions to answer. But i think this will at least point you in the right direction now. Have you changed out your TPS?

BOB

BO

check your low pressure switch. If it isn't working properly or is working intermittently, it could cause this. That is the switch that tells the computer that there is freon there, and allows the compressor clutch to engage.

Welcome to the group... now if you work on your reading comprehension...

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tmvs opined in news: snipped-for-privacy@corp.supernews.com: