A/C problems?

Hello,

It sounds like the HVAC controller is going out and needs to cool before it will work again. To be sure here is a guide to check for power and signal to the fuses and relays with the air conditioner wiring diagrams so you can see how the system works:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Here is the fuse panel and relay locations and how to change out the HVAC controller. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

Just had compressor replaced. Outside temperature 80 degrees. Temperature set to low. Fan on high. Recirculate air on. Air temperature coming out of duct 58°. When fan is turned on low speed temperature drops to 43 degrees. Is this okay or should it stay 43 even when the fan is on high? I have a 2001 Toyota Highlander v6, and when I do the same test with this vehicle the temperature stays at 43 degrees, with the fan on low or high.

Thanks for your help.

Good afternoon.

What are the high and low side pressure readings when the blower fan is on high?

Do you have gauges to test the pressures?

Roy

I do not have gauges. The compressor was installed at a shop.

You can rent a set or buy a cheap set at Harbor Freight.

I need those readings to determine if the pressures are correct.

Is the cooling fan on when the A/C is on?

Roy

Yes.

Okay, I need those pressure readings.

Okay. I will see if I can get them.

Hi, my car blows cold for minutes then blows warm. I charged it with Freon and it's about up the 6th line.

Then while the engine is on the fan will turn off for good seconds then turn on for seconds then turn back off for seconds.

when i'm on idle you can hear the fan loud while the A/C is getting colder and warmer.

temperature is always perfect though

what could it be? thanks

Hi,

I need to know what you mean by up to the sixth line. Also, do you have access to an AC pressure gauge set? The fan coming on an off could simply be related to when the compressor is engaging and disengaging, so that may be normal.

If the Freon is too low or it is overcharged, it can cause this type if issue. Here is a link that shows how to add Freon. Take a look through it and let me know if it is what has been done.

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

Let me know.

Joe

As it got hotter my A/C just stopped one day. I bought a can of coolant with a psi gauge, I checked the pressure first and it read 150 psi with engine on and off. all fans are running. and the vehicle has never had any A/C service and I am the original owner. local auto parts store manager suggested letting out pressure and only hot air comes out of the hose no oil or anything else, note we used the filling hose without the can hooked to release pressure. pressure is now down to 40 and it still blows hot air. wondering why would the pressure be 150 in the first place? I also checked the relays for the A/C and they were good.

Good afternoon and welcome to 2CarPros.

First off, please refrain from simply venting the refrigerant into the atmosphere! That should only be done by a qualified person who has the equipment to reclaim and dispose of used refrigerants.

The pressures you are dealing with when working with an AC system are a little confusing. They are not the same every day. It depends on the outside temperature and humidity.

Here is a good resource for charging your AC system:
https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Hope that helps
Jon

Hello.
I recently had the A/C repaired. It was not blowing any cold air. Dealer said there was a hole in the condenser probably caused by road damage and that it was not covered under the warranty (bought the car new in March 2010). Is it possible for a rock or debris to put a hole in the A/C condenser on a 2009 Honda Accord? I just want to make sure I'm not out $564.00 when it could have been warranty work.

Thanks, Keven

It's certainly possible and does happen quite often although unless there was a visible ding in it, it might be hard to prove.

This guide will help us fix the issue

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Please run down this guide and report back.

The same exact thing happened to me on my 2004 Honda Accord. I had about 30k on it and the AC went out. When i brought it into Honda they said the AC Condensor needed replacing. They said the cause was posibally a rock that damagned it and it wasn't covered under warranty. Unfortinately we both just had bad luck.

Hey guys i have a 08 honda accord v6 and the car had a bad clutch on the compressor. i had 12 volt going to it but it wouldnt turn on. I replaced the compressor with a aftermarket compressor, Compressor works is the brand, the put the new compressor in put the system into vacuum and leak tested good no problems, a friend has a robinair ac machine, charged the system to 15.9 oz which is what it calls for and the air only comes out at 60 degrees going down the road according to a thermometer we have in the vent. i added 4 oz of oil to the compressor before i put it in and my gauges readings are where they should be, when running low side is about 28 psi and high was around 200 i think it was. it was a hot day about 90 with humidity. any ideas why my ac is warm. when i gran the low side line under the hood, its cool but not cold with condensation on it like it should be. Could the aftermarket compressor not be working right? i am out of ideas. Thanks for the help
Jon

should be a pound low side shold be a little higher but check your temp actuator it may not be blocking heater all the way especially if suctionline is cold. see pic make sure it gets power and try pulling hvac fuse for 60 seconds with key on sometimes they reset otherwise it wil need to be scanned.

thank you for the response. Its almost like the freon isnt flowing properly because the low side hose is cool but not cold like it should be. cool meaning maybe 60 degrees. I know usually with a properly working ac that line is cold cold with condensation dripping off it on a hot day. any ideas? thank you
Jon

when you replaced the compressor was it ful or empty or didn't it say or you know? New compressors come full of oil. what kind of oil did you use if it's not pag oil it's the wrong kind. it may have to much oil in system. when you hooked up charging station how long did you evacuate? Should have done 30 minutes with a Freon sweep in between. we really don't know what you did so giving any answer without actually doing a a/c performance test gives us not much to go on at all.

sorry for not being clear. when i removed the old compressor it only had about 1 oz of oil in it. on the new compressor it came with shipping oil in it, i drain it all out and put just under 4 oz of pag oil in it. i was told by a few people that it should have 4 oz in it. after everything was done, i put the system into vacuum for 20 mins with a 10 minute leak test and it was fine. charged it with the 1 pound and isnt cold at all. only about 60 degrees tried a little more and a little less of freon and made no different. thank you for the help
Jon

how much vacuum did it pull it should have pulled at leas 27" if not there is a leak. but check the air mix actuator see if it's getting power.