Search found 77 matches

by mk378
Sat Aug 06, 2016 5:36 pm
Forum: Automotive Air Conditioning Forum
Topic: What should rotation sensor output look like?
Replies: 4
Views: 7577

Re: What should rotation sensor output look like?

I think the sensor is a reluctor like the pickup in a distributor, puts out a small AC voltage, frequency proportiional to rpm. This type of sensor is quite trouble-free and easy to check by coil resistance. Like GM Tech said, the amplifier is almost certainly the culprit. If you have some experienc...
by mk378
Thu Aug 04, 2016 8:29 pm
Forum: Automotive Air Conditioning Forum
Topic: Acura RDX AC Acting Strange
Replies: 15
Views: 24431

Re: Acura RDX AC Acting Strange

.020 is about the maximum you want. It is hard to measure on a used clutch because the plate and pulley usually wear into each other in a matching groove pattern. Trying to measure that with a flat feeler gauge makes you think the gap is smaller than it actually is. Bottom line just take some shims ...
by mk378
Thu Aug 04, 2016 4:16 pm
Forum: Automotive Air Conditioning Forum
Topic: Accumulator not sweating
Replies: 10
Views: 19727

Re: Accumulator not sweating

If you didn't charge by weight, you may be undercharging it trying to keep the high side down, because there's a condenser issue (worn out fan clutch etc) that would be apparent with a full charge.

Most systems don't get really fully cold at idle anyway.
by mk378
Thu Aug 04, 2016 4:09 pm
Forum: Automotive Air Conditioning Forum
Topic: 97 Honda Civic Evaporator freezing up
Replies: 1
Views: 4686

Re: 97 Honda Civic Evaporator freezing up

Yes there is a thermostat. If you remove the glove compartment you will see a little box on top of the evaporator box with a three wire plug, and two gray wires permanently attached to it that go to the sensor which is pushed directly into the evaporator. I think you have to remove the evaporator bo...
by mk378
Thu Aug 04, 2016 4:00 pm
Forum: Automotive Air Conditioning Forum
Topic: Compressor noise after freon added to 'blowing warm' system
Replies: 9
Views: 14414

Re: Compressor noise after freon added to 'blowing warm' system

You could replace the lines that were cut to put the tees in, with stock ones from a front air only truck.
by mk378
Mon Aug 01, 2016 5:33 pm
Forum: Automotive Air Conditioning Forum
Topic: Electric Fan Wear
Replies: 7
Views: 13409

Re: Electric Fan Wear

Check that all the fins of the condenser are clean and not bent shut. Since it's not a stock condenser, make sure there is no gap around the edges where air can bypass the condenser. Electronic detector is the best way to find a major leak like that. Put only small amounts of refrigerant in so that ...
by mk378
Mon Aug 01, 2016 1:15 pm
Forum: Automotive Air Conditioning Forum
Topic: Compressor noise after freon added to 'blowing warm' system
Replies: 9
Views: 14414

Re: Compressor noise after freon added to 'blowing warm' system

High side?

A CCOT system that is undercharged but otherwise in working order will cycle the compressor rapidly. The low side will go down to the switch cutoff (25) and cycle from there.
by mk378
Sun Jul 31, 2016 7:07 am
Forum: Automotive Air Conditioning Forum
Topic: Advice needed
Replies: 8
Views: 14149

Re: Advice needed

Is the noise really from the compressor? A lot of times one of the other pulleys will get noisier with the A/C on because of increased strain on the belt. Listen closely using a piece of hose to your ear to try to localize the noise. If it is from inside the compressor, waiting for the compressor to...
by mk378
Sat Jul 23, 2016 1:27 pm
Forum: Automotive Air Conditioning Forum
Topic: Big truck a/c help
Replies: 7
Views: 11607

Re: Big truck a/c help

Getting warmer on a long run could be evaporator freeze-up. Pull over after a while and check for ice on the lines. If the sleeper TXV is stuck open it's going to interfere with operation of the front unit. Make sure the new front TXV is properly installed with the bulb attached to the evaporator OU...
by mk378
Sat Jul 23, 2016 11:47 am
Forum: Automotive Air Conditioning Forum
Topic: Looking for Help with my AC
Replies: 12
Views: 20836

Re: Looking for Help with my AC

Remove the one shim and try it. Like someone else said, it's not too close unless it rattles or drags when off. The magnetic force from the coil normally gets weaker as the coil gets hotter. Thus it is very common for a marginal gap to engage every time on a cold start, then fail to re-engage later ...