Jump to content
Ultimate Subaru Message Board

What is the direction of flow at heater core?


Recommended Posts

I'm not getting a lot of heat out of my '91 Loyale and I'm pretty sure from reading other posts that my heater core is "congested." When the engine is warmed up and I turn on the heat I get a quick, warm blast initially followed by steady cool air. I would like to try flushing the core as my first step, but I want to make sure I backflush first to avoid driving gunk deeper into the core. So, my question is: which way does the coolant flow at the core? Which port is the inlet and which is the outlet? Thanks!

Link to comment
Share on other sites

The one on the left/bottom is the inlet.

I think to clarify it should be said that the outermost hose, the one that gos straight under the manifold to water pump is the inlet into heater. The one closest to the center of the car, coming from the intake body is the inlet. They can be reversed as GD said, but then the two hoses would cross over eachother, and the water is still going in the same direction through the hoses, just backwards through the heater. This is good to do when you run a cleaner through before your flush. Switch the hoses, run the cleaner and do your flush. Then switch them back(or not) and refill system.

 

I've also flushed just the heater core with a garden hose cut and clamped on to the outlet.

 

As a side note, poor coolant circulation can cause the same effect on the heater function. How sure are you that you've got good pump circulation? If you've run just water for a while, and you've got an aftermarket waterpump, the impeller may have rusted away. You would likely be overheating or running hot sometimes as well. If you've got good antifreeze with no rust in it this is probably not the case. Just thought I'd pose the question.

Link to comment
Share on other sites

on mine I just disconnected the hoses from the engine end (keeping them attached to the heater core end so I had some hose to work with) and put the garden hose up to one end... I didn't have the pressure up very high, and when I started to get a lot of resistance I'd back off and switch to the other hose and do it again... it didn't really move the first few times... but after going back and forth from inlet to outlet more and more gunk started coming out... once I was getting good water flow I could hold the garden hose right up to the heater hose for more pressure and pushing erosion action...

 

and not to hijack the thread... GD, what is wrong with doing it on an ea81? is there something like a 1-way valve in there? bad for the flow control flapper thing?

 

 

 

--Spiffy

Link to comment
Share on other sites

  • 4 weeks later...

Please sign in to comment

You will be able to leave a comment after signing in



Sign In Now
 Share

×
×
  • Create New...