Question about 1991 Honda Civic

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1991 Honda Civic Hatchback LXI - Broke HOT/COLD knob

1991 Honda Civic Hatchback LXI -
I broke my HOT/COLD knob b/c I turned it too much to the point to where it's stuck and does not work. Just being an idiot.... It's extremely cold and my heat barely works on 1. What can I do? I know in the back I can manually change it from hot to cold, but thats not working. Maybe I'm doing the wrong thing? Something else must have happened or I'm just closing the wrong thing. How can i get heat and be able to turn it up to 2, 3, or 4? THanks so much!!!

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  • Anthony Cifelli Feb 01, 2010

    Thanks for writing back. I'm not really familiar with where the heater control valve/heater hose is located. What should I be looking for?
    The cable in the back (Behind my radio/heater controls is not working. Is that what you meant? I have no idea where anything is under the hood. However, it does feel like there is hot air mixing in with cold air. SOmetimes its extremely hot and other times in and out..... DOes that help?

    Dont know why I kept turning it in the first place!!!

    Thanks!

  • Anthony Cifelli Feb 02, 2010

    Thanks for the image!! The fan motor does work, however it only occasionally blows warm air, not hot on 1, but on 2, 3, and 4, it's only cold, which before it was always hot! Also, i twisted/turned my hot/cold knob so much that it's striped and the cable is messed up... Does that explain it better? That's the only damage I've done, nothing with the engine/motor or anything else. I couldn't see how that would effect the heater valve cable under the hood. Would it?

    I know its something simple that could make this work, i'm just illiterate with vehicles. If i could get the frame apart where the heater is to see behind there, it would probably make my life easier, but I don't know how....

    Thanks so much!!!

  • Anthony Cifelli Feb 04, 2010

    Yes, this is exactly what happened. I already been closing the box, so I will check to see if the valve is open. I will let you know later. I have my girl friends car, b/c it was so cold..LOL.. So, later, ill check under the hood. I didn't know that this controlled two different things!!!

    So, when the summer comes, am I gonna have problems with my AC now too?

    Should I just go to a junk yard and get the parts? If so, what am I asking for???LOL Sorry!!!

    Appreciate all your help!!

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The heater control cable may have broke. you'll have to go under the hood and find the heater control valve located on one of the heater hoses. The valve is mounted to the firewall and has the other end of the cable attached to an arm. Manualy open the valve by moving the arm toward the firewall untill it stops. The other issue is the blower motor only operating on low. Normally if the transistor fails the motor only operates on Hi, so lets look at the switch. Unplug the white 6-pin connector from the switch and with a jumper wire jump pins1&3 black wire & blue/black wire. This bypass the switch asuming there is 12volts on the blue/black wire the the fan motor will come on high. If it does the switch is bad. If it doesn't the blower motor is worn out or you have a bad ground. it is common that the brushes wear out in the motors over 150k. try this tap test. with the blower motor turned on try kicking the blower motor.this will cause the brushes in the motor to temporary make better contact untill you can get a new motor. -hope this helps

Posted on Jan 31, 2010

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  • ezriders4 Feb 01, 2010




    Here's a pic of what your looking for under the hood in the back left/center of the engine compartment. When the heater control valve is open it lets hot water flow through the heater core. Turning on the fan blows air across the heater core giving you heat in the pass compartment. Turn the heater control valve open by moving the arm toward the rear of the car. Get your fan working and this will give you heat until you get a new/used heater control panel. I hope I'm understanding you correctly..... Your fan motor is not working in 2,3,&4 switch position, just in position 1, correct. Also your not having an overheating condition with the engine are you?

  • ezriders4 Feb 04, 2010

    Allright, the heater control knob controls two cables one goes to the heater control valve under the hood and the other one goes to the air mix door inside the heater (HVAC) box. If the control knob is broken and the cables are messed up, it is not operating the heater control valve or the air mix door and they could be stuck on the cold setting. This is why it is blowing cold/warm air. If you allready manually moved the heater control valve to hot (under the hood) and your still getting cold/warm air lets also try moving the air mix door inside the HVAC box to hot too. just follow the other cable to the arm on the bottom of the HVAC box and manually move it to the left or right. This moves the mix door inside the box to draw airflow through the heater core. So if you got hot water flow through the heater core via the heater control valve and airflow directed across the hot heater core via the air mix door, than there is hot air blowing from the vents.

  • ezriders4 Feb 05, 2010

    You need to ask for a Heater Control Panel and it would be a lot cheaper to get a used part, although during the summer months all you would have to do is turn the two arms back to the cold position to use your a/c, if it's to expensive to repair.

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