a/c only blows high

[justinj]

My a/c is good and cold, it just works on high. Any other level of the fan hardly any air comes out. Help.

 

[wishuwerehere82]

There is a module on the firewall that has resistors inside that control the low and medium fan speeds. Maybe the connection has come loose, or the wires inside have corroded.

 

[George Black]

This is a common C3 problem. Wishyouwerehere82 is correct. Probably either (1) the relay (silver rectangular box on passenger side of firewall) or (2) the resistor. Check the relay first. You can bypass the relay and see if the lower speeds return. If not relay proceed to the resistor. The plug on top of the AC evap. box attached to the firewall is connected to ballast resistors. You can remove the plug, two screws, lift the cover up and you will see several long resistors. Replace the resistors. Not expensive.

You might want to check the heater/AC fuses also. Sometimes just removing, rotating and reinserting a "bad" fuse can repair it by making a better contact.

Another possibilty is the switch in the console itself. However check the relay, resistor and fuses first. I will be surprised if it is not one of them.

PS Living in Lumberton, TX you only need the high speed anyway. With all the humidity and heat in SE Texas you will never use the lower speeds! I lived in Beaumont for 10 years, I know!

 

[wishuwerehere82]

My cousins live next to you in Longview. And my grandfather lived in Beaumont. I don't know how you guys deal with the heat. A/C on full max!

 

[George Black]

My cousins live next to you in Longview. And my grandfather lived in Beaumont. I don't know how you guys deal with the heat. A/C on full max![/QUOTE]

Pete: I was in Longview,Tx. 2 days ago. I have been to Rochester,NY several times to visit a good friend I have there. Rochester gets way too much snow for me. My friend there can not believe that a person can play golf here year round--and drive a corvette daily. It has been in the 70's with sunshine here all week. I think there are only about 10 days a year I do not use the AC in my car or home.

 

[wishuwerehere82]

I keep thinking somewhere in between, without hurricanes or tornados would suit me just fine. My parents came here after WW2 and I have been here ever since. Yep. winter is not fun.

 

[justinj]

Thanks for the help I will work on it this weekend.

 

[wishuwerehere82]

You can pry up the tabs on the relay case and pull it off to get inside the relay. The contacts can be cleaned up with a file or some emery paper. Good luck!

 

[justinj]

Bought a new relay today works like a charm.

 

[wishuwerehere82]

Groovy!