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Old 20 Dec 2010, 08:16 pm
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Default heat wont get hot in civic?

Hi guys, my gf has a 94 civic ex, and its getting to be freezing weather now. When I go to turn the heat on, air comes out of the vents just fine, only it never turns hot. Is this a simple fix? Thanks!
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Old 20 Dec 2010, 08:31 pm
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The little 4 cylinder engines don't generate that much heat to start with. But it should blow out warm air after it has warmed up just the same. Does the temp gauge reach "normal" operating temperature? With out having that answer, maybe the thermostat needs to be replaced. Used to be when a thermostat failed, it failed in the close position most of the time - not good. Now they're designed to fail in the open position to prevent over heating the engine. So if it isn't working, it's in the open position and this prevents the water from getting warm since it is continuously circulated through the radiator too much.
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Old 20 Dec 2010, 08:46 pm
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Is the temp control lever working , can you hear the door open and close , find your heater hoses under the hood , warm the car up and put your hand one each one of the heater hoses to see if they get hot .If only one is hot your heater core is plugged . Replace it , and flush your cooling system .
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Old 20 Dec 2010, 09:01 pm
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Assuming the coolant level is okay, the most likely cause is the heater control valve, under the hood, near the firewall, in one of the heater hoses. There will be a small lever on it that should move when the temperature knob is turned. As they age they get too stiff to move by the knob and have to be moved by hand. Replacement is not as easy as it looks because the hose gets a death grip on the fragile heater core pipe. Fortunately, she will see you as a hero if you open it now and close it in the spring.
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Old 20 Dec 2010, 09:16 pm
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Look for the following:































1.) Check to make sure the Hot/Cold knob is actually turning the stud in the control. The clip on the back usually cracks and allows the knob to turn but not the shaft its attached to.































2.) If #1 is OK, then check to make sure the hot/cold plenum door is working. It may be gummed up or the servo may be bad.































3.) If #1 & #2 check out, replace the thermostat on the engine. If its stuck open the heat will barely get warm.
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Old 20 Dec 2010, 09:31 pm
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i would check the thermostat first then if it still working i would check the heater core which i s under the dash not a fun job
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