Hi I have a 92 loyale and having heater trouble and I've done everything I can think of to get it to work and it still won't.. Wondering if there is a heater control valve and where that might be

Nope, no valve from the factory.

 

First, you need to check the heater core for a blockage. Thats super simple. Get the car up to temp, and check the heater hoses. If they are both the same temp, the core is good. If not mark the cold one, and flush it thru that side with the garden hose.

 

If the core is good, then the blend door may not be opening. That may just be a cable adjustment.

 

If the fan isnt working, then it may be the switch, or the resistor pack.

 

The heater on the ea cars is pretty basic.

Edited December 25, 201510 yr by crazyhorse001

Already tried the heater core and flushed it just for good measure. How do I check the blend door?

I dont have one to look at, but you should be able to poke your head down under the dash while someone moves it from hot to cold and back. You should see levers moving when you do. If you cant see the levers, im not sure where to tell you to look. Maybe one of the gurus can help out with pics or scans from the service manual.

Edited December 26, 201510 yr by crazyhorse001

here's a thread I started last year. It's got a decent pic

 

http://www.ultimatesubaru.org/forum/topic/149953-anybody-had-the-arm-come-off-the-heater-blend-door-86-ea82/

I'm not seeing levers moving but they are all covered up and I can hear the door opening and closing just so damn cold to work on it or drive it and I have no clue haha it's -10 in idaho

Also I tried flushing out the heater core worked decent for a few days now one of the hoses isn't as hot as the other again

someone more knowledgeable than me will probably chime in, but that sounds like the heater core is still partially clogged

If you have one hot hose, and one not so hot, yep the heater core is plugged. You may be able to put a SMALL amount of drain cleaner(like maybe a cup) in the hose. Take both off at the engine, raise the ends as high as you can, put the cleaner in, then fill the hoses with water. I reccomend CLR brand to clean it with. Let it sit an hour or so, then flush the core with water. The CLR isnt as harsh as the other stuff. Hopefully you're not undoing a previous repair with a stop leak.

 

I'd try this before having to take the dash apart to change the heater core.

Couldn't find clr but I flushed it again and got the air out of the system and hoses are the same temp. But the heat is only working decent on drivers side floor and on settings 2-3 and setting 1 does nothing

Setting 1 on the blower. Uses the smallest resistor in the speed control. It often burns out. It can be fixed or replaced. 2 screws hold the resistor block in the duct in the blower housing. Near the motor.

Any other ideas why it's not getting hot?

Sounds like the resistor pack is gone bad on you. As a temporary measure you can pull a fused wire directly to the motor from the battert. That will get your fan running on hi till you can source a resistor pack.

 

Also it sounds like the doors in the control box arent working properly. Thats gonna require pulling stuff apart.