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A/C and climate control problems

 
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Old 04-30-2013, 09:53 PM
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A/C and climate control problems

Hey. So summer is finally rolling around, so its about time I fix my air conditioning. First, a word of warning: I have never worked with a/c before, and I am pretty new to working on cars. First of all, my fan speed only works on high. I am guessing that this thread will help me with that: Air Fan speeds not working

The real problem is my A/C not working. When I turn it on, it just blows out hot air (not even outside temperature air). I read on a thread that this could just be caused by loose solders on the back of the climate control.

The guy I bought it from said that it was working fine, but he power washed the engine bay before listing the car on craigslist, and that it quit working. He had just put in the entire system since the previous owner (2 before me) had removed it. He said his guess was that the relays got water in them and quit working. I finally got around to looking under the hood, and found this:

I am going to test them with a multimeter tomorrow (is there another way you all would recommend testing them?).

If all the relays are good, I'll check the solders on the back of the climate control. If all that is ok, what should I do next? Thanks in advance!

Last edited by lorias; 05-01-2013 at 02:11 PM.
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Old 05-01-2013, 02:13 PM
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Re: A/C and climate control problems

So the relay connections were all covered in a white goop. I'll pick up some electrical parts cleaner and see if that fixes anything. I have a friend with a 1995, so if cleaning them doesn't work I'll borrow his relays and see if that's the problem.
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Old 05-01-2013, 03:11 PM
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Re: A/C and climate control problems

let us know if does work because when i looked at mine it had the same kind of goop on it.
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Old 05-01-2013, 04:29 PM
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Re: A/C and climate control problems

I don't think those two relays have anything to do with your blower. If your blower is only working on high, you have a bad blower resistor. The white goop is likely dielectric grease, which keeps moisture and dust out of the connections.
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it'll sound like an ultralight airplane or a moped exhaust funneled through a kazoo.
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Old 05-01-2013, 05:32 PM
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Re: A/C and climate control problems

My main problem is that the AC doesn't blow cold air at all. Only hot air. The blower resistor was my guess for the fan speed too. Do you guys know what prongs are supposed to conduct on those relays when tested with a multimeter?
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Old 05-01-2013, 05:49 PM
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Re: A/C and climate control problems

Not a clue. Never had to mess with them, so I have no idea what they go to. However, being by the washer reservoir, I'd say they're more likely to be related to your cooling fans than your blower motor.

So let's start off with some simple questions.

Your problem is that the A/C doesn't get cold, most importantly, right?
1) R12 or R134-A?
2) Is your compressor coming on?
3) Have you checked your system pressures to ensure that there's enough refrigerant in the system to actually cycle the compressor?
4) Is your evaporator cooling off at all? (this is assuming the rest of the system is working properly)
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Old 05-01-2013, 07:12 PM
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Re: A/C and climate control problems

1) R134-A
2-4) have not checked, but will after the weather here calms down (super windy).
Is there anything in the A/C unique to honda that I should know about while checking these? My mechanic friends own audis/bmws, and they help me with a lot of stuff.

Once the wind dies down, I'll check the solders on the back of my climate control unit. I wouldn't be surprised if this was the problem, since the air coming out of the vents feels like heater air even while on A/C. Thanks for the help.
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Old 05-02-2013, 08:32 AM
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Re: A/C and climate control problems

Nah, it's a pretty simple setup.
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Old 05-06-2013, 08:10 PM
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Re: A/C and climate control problems

Hey. So I was trying to take out my climate control unit and saw this (this pic turned out way better than I thought it would):


Are those two plugs supposed to be connected? What do they go to? Also, how hard do I have to pull on my climate control unit to remove it? I removed the radio and the two screws above the radio, but it still doesn't want to come out. I didn't want to pull too hard and break anything.
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Old 05-06-2013, 11:34 PM
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Re: A/C and climate control problems

3 pin is data link connector. Don't worry about it. 2 pin is the connector you jump the pins to flash your check engine codes. Don't worry about it either.

You don't have to pull it hard, but the cable that leads to the heater control will hold you back. Best bet is to disconnect it under the dash on the passenger's side, in my experience. Why are you pulling the control head again?
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Old 05-06-2013, 11:38 PM
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Re: A/C and climate control problems

I thought I might as well check my connections. Thanks for the info! My compressor is coming on, but I think I am low on freon. I'm going to check the pressure to be sure tomorrow.
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Old 05-06-2013, 11:40 PM
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Re: A/C and climate control problems

Good to see you're making progress. Did you ever replace that blower resistor?
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Old 05-13-2013, 05:33 PM
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Re: A/C and climate control problems

Well, the compressor was good, the freon had good pressure and no leaks, the relays were all good, but the system was getting no power. I think there is a short somewhere. Anyway, I gave up and brought it into my mechanic, so hopefully he will be able to figure it out pretty quick. I haven't replaced the resistor yet, but I will as soon as I get it back from the mechanic. I will let you know what it was if he figures it out. Thanks for all the help.
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Old 05-13-2013, 06:45 PM
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Re: A/C and climate control problems

Chances are that one of the pressure switches is bad or has a bad connection.
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