Loss of Heat

95greensvx · #1 01-21-2009, 05:06 AM

I am assuming that my heater core went bad but hoping it's something much easier. My 92 sat for a few weeks before I was able to acquire the small part I need to fix the shifter assembly. I started it up, let it warm up and everything worked fine, blew out warm heat and all was well. I then drove down to forked river, new jersey for my work for this week. It was a 4 hour drive and the heat worked the entire way down. The next morning, yesterday, when I got up and warmed up the car the heat just never decided to work. Is there anything I could look for to diagnose the problem or does it sound like a heater core malfunction? Thanks in advance.

dcarrb · #2 01-21-2009, 06:04 AM

The only way a heater core could malfunction would be if it were leaking, and even then you'd still have some heat. Or it could conceivably be clogged. More likely there's a problem with the mechanism(s) that control airflow through the core.

Did you try raising the temperature setting to see if you get heat at any point? One of mine starts out fine but the heat wanes the longer I drive. On trips of an hour+ I have to continually bump-up the thermostat to stay comfortable.

dcb

paulmeisterpk · #3 01-21-2009, 09:22 AM

Mine did this last year, the small bolts that were holding the servo that controls the air flow through the core were missing, so the motor itself was spinning instead of opening the door to let air flow. It is located under the dash on the passenger side towards the center of the car. Something to check out before going too far.

95greensvx · #4 01-21-2009, 10:13 AM

I tried fluctuating the settings on the instrument panel and it still continues to blow out cold air. I will take a look and see if those screws happened to come loose.

svxistentialist · #5 01-21-2009, 12:33 PM

Just as a precaution you should pull the codes from the aircon, just in case it is an electrical fault with one of the door motors or something.

You can download the code reading method in a folder http://www.subaru-svx.net/photos/user.php?How-To|14263
here. It is on a Word document.

If it does not show a code then it is probably all right electrically, and you need to see why hot water is not getting to the core.

Joe

kwren · #6 01-21-2009, 01:34 PM

sorry missed some earlier information

nothing

Keith