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Heater Matrix Hoses - check correct flow


Tom777
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Hi All,

I’m looking for help from someone who can confirm that my hoses are connected correctly from engine bay to heater matrix. Please see picture for reference. This is a UK model Lexus Is250 2007.

I have issues with heat in cabin and want to rule out incorrect hose connections from previous ownership/services. If someone could compare against their own IS250 that would be great. Looking at the picture is it correct that the blue line lower hose from engine should be connected to the inlet on the left inlet passenger sid. So blue lower hose goes to left inlet and upper red hose goes to right side inlet ?

Best thing is if someone actually could check against their own car. I don’t need help with other things explaining my heat in cabin issue. I am aware of all the other things it could be but want to rule out this factor also. 
Im basically getting less heat on passenger side/nearly cold air while driver side is normal with heat.  Want to rule out incorrect hose connections. See picture.

thanks  

26BA9A70-7FD5-4557-837C-9FB978B17679.jpeg

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As you can see on picture from Uk heater matrix the left inlet from engine bay runs into top of heater matrix and right side outlet in engine bay is from bottom of heater matrix. I’m wondering if it matters what way the flow goes. I could think that the top red hose from engine bay should run into left inlet to flow to top of heater matrix. And then the outlet from heater matrix should be the right outlet flowing into the blue lower hose back into engine. Not sure what the logic/physics should be for the flow. 

39A43A72-74F2-44E0-BAE8-CBF1B0981C27.png

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1 hour ago, Alfalfa said:

Hi, some pictures of my car and 2 pictures of my oil catchcan installation.

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Thanks looks like you are in a left hand drive car. I’m in a right hand drive car and not sure if the heater matrix is turned the same way in yours - meaning the blue line is running to the the bottom inlet of the matrix. 

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Thanks looks like you are in a left hand drive car. I’m in a right hand drive car and not sure if the heater matrix is turned the same way in yours - meaning the blue line is running to the the bottom inlet of the matrix. 

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Nah. The matrix seems to have the same flow and design no mater if it’s LHD or RHD so that doesn’t seem to be the problem. Need to take the matrix for a flush to see if this will resolve the issue with low heat on passenger side. It’s not the actuators etc as this is all spinning nicely. 
very frustrating issue to have with a luxury brand car. 

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59 minutes ago, ColinBarber said:

Here is the flow diagram

image.thumb.png.d01467703c3cfe44051d7e7a2738bb4e.png

image.thumb.png.47f4ea4ecccb8319e9cc3eca808d9e81.png

Yes this also confirm what I read. The radiator has flow top down while heater has flow bottom up. Thanks. My culprit is not wrongly connected hoses. Just wanted to make sure.

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