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So this is modern content. My Lexus GS450 only blows cold on the passenger side, drivers side behaves as it should hot and cold.
So one would assume the temp sensor for the dual zone is knackered, or the mechanism that moves the mixture flap is broken for the passenger side.
Well nope, having had the glovebox off when you go from LO to a temperature on the passenger side the motor moves and the flap closes, so why on earth is it still absolutely baltic on the passenger side??
I am hoping maybe (maybe) its somehow a clogged matrix so there's flush in now and I'll put some pipes on it and flush out tomorrow. But pretty weird that its somehow only clogged the passenger side of the matrix (there's only one for both sides I checked). I think I maybe clutching at straws with the coolant flush.
Anyone got any ideas, thoughts, musings? Gotta add putting it on recycle or changing it to foot, face, windscreen doesn't change matters at all.
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Nissan Laurel SOLD  BMW E34 Diesel SOLD  Toyota Soarer 4.0 V8 SOLD Audi A4 1995 TDI SOLD Peugeot 205 1.9 TD SOLD Lexus IS300 SC |
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Heating passenger side and nothing on drivers side? Sounds ideal for us. Wife always reckons it's cold and wants the heater on when I'm taking layers off cos I'm hot.
Hope you find a solution to your problem.
edit; misread your original post.
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Last Edit: Dec 2, 2023 21:13:32 GMT by igor
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Going on the basis that some manufacturers like to over complicate some things. Does it work if the passenger seat is occupied?
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Going on the basis that some manufacturers like to over complicate some things. Does it work if the passenger seat is occupied? No I've had some chilly passengers the last few days. Gonna park on a good slope after flushing out the matrix and hope its an air pocket or something. |
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Nissan Laurel SOLD BMW E34 Diesel SOLD Toyota Soarer 4.0 V8 SOLD Audi A4 1995 TDI SOLD Peugeot 205 1.9 TD SOLD Lexus IS300 SC |
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So I flushed out the matrix and the coolant, refilled paked on a good slope and bled the system. And we're no warmer maybe a little. Anyone got any thoughts or feelings? 😂 I'm pretty stumped RN. I really don't want to have the whole dash apart without a plan of action. I was hoping to find a flap, cog or motor not working.  The whip in question. |
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Nissan Laurel SOLD BMW E34 Diesel SOLD Toyota Soarer 4.0 V8 SOLD Audi A4 1995 TDI SOLD Peugeot 205 1.9 TD SOLD Lexus IS300 SC |
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Davey
Posted a lot
Resident Tyre Nerd.
Posts: 2,197
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So I flushed out the matrix and the coolant, refilled paked on a good slope and bled the system. And we're no warmer maybe a little. Anyone got any thoughts or feelings? 😂 I'm pretty stumped RN. I really don't want to have the whole dash apart without a plan of action. I was hoping to find a flap, cog or motor not working. The whip in question. Blocked cores seems to be very common! US forums having same issues with driver side. Multiple flushes seems to be the cure. |
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K11 Micra x3 - Mk3 astra - Seat Marbella - Mk6 Escort estate - B5 Passat - Alfa 156 estate - E36 compact
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I'll throw some dishwasher tablets in it and see if that helps. 😂
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Nissan Laurel SOLD BMW E34 Diesel SOLD Toyota Soarer 4.0 V8 SOLD Audi A4 1995 TDI SOLD Peugeot 205 1.9 TD SOLD Lexus IS300 SC |
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Dec 29, 2023 11:02:24 GMT
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This might not be of any use at all to you, but I have only seen heatercores that are "completely" blocked, giving basically no heat at all. What I have seen on "modern" cars is that have the flaps operated with electric motors is that they can lose there position and not opening/ closing as they should. Usually there is some sequence of button pushing that get them to reset. But you have checked that the flap moves, so it shouldn't be a problem, if it moves the flap correctly that is.
Another thing is that there might be a vacuum/ electric actuated valve on the inlet side for the heater core, often placed on the engine side, that closes the flow of water to the heater core when you put the AC on so that it will cool faster. These can go wrong, stick or just break.
Hopefully it is just that the heater core is partially blocked like the above poster said and that flushing it a couple of times will help, just wanted to give some food for thought if you get stuck or if somebody else hase a similar problem.
Best regards,
David
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