XJ XJ6 / XJR6 ( X300 ) 1995-1997

Ď97 XJ6 Heater Core Plumbing Blasphemy

 
  #1  
Old 01-27-2019, 04:16 PM
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Default Ď97 XJ6 Heater Core Plumbing Blasphemy

In my 5 years of ownership my heat has never exactly worked and I just havenít looked into it until today. The problem is quite obvious but the solution is anything but. For some reason the previous owner bypassed what looks to be the heater control valve. Iím not sure why exactly one might do this but thereís only one way to find out, un-bypass it and reconnect all the cooling hoses. If anyone would be willing to send a photo of the proper hose locations or say which hose connects to which, thatíd be ~fantastic~! Iíll include some photos of my spaghetti mess of hoses.
It looks like there are two connections on the front of the heater control valve and two round back, then naturally two that go into the firewall and into the heater core. Looks like both hoses coming from the firewall lead into the same hose that heads back up towards the front of the car. It does not seem as if the heater core has been bypassed so Iím going to assume that the issue lies in the heater control valve. Just by a quick look, they seem mighty pricey so that sound like a junkyard trip coming up here soon, assuming I need another heater control valve.
Thanks for any help, cheers!



 
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Old 01-27-2019, 05:06 PM
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Attached are some pictures that should get you started. Bear in mind this is RHD but should be the same I think.









 
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Old 01-27-2019, 06:54 PM
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See page 110 of file below

Keep in mind the heater water solenoid is not constant on or off but cycles by the A/C control mod as it reads the cabin temp sensor that gets clogged with dust

Look to make sure you have hose # 7 from the engine block to the pump side port inlet

Do you have odd hose # 12 behind the water solenoid ?









 
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x308 x300 703_SG.pdf (2.88 MB, 7 views)

Last edited by Lady Penelope; 01-27-2019 at 09:52 PM.
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Old 01-28-2019, 08:22 PM
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I'll head out tomorrow and take inventory of what I have and see what I need, thanks a bunch both b1mcp and Lady Penelope !
 
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Old 02-01-2019, 08:02 AM
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I think Parker means hose #2.
12 is calling out the little plastic hose locator clips.
 
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Old 02-02-2019, 12:56 AM
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The hose correctly as # 2 by Aholbro1 is pretty much the same as on the X308 ( for local salvage yard parts sourcing ) with a added flow check valve that in my opinion should better the flow logic

The X300 design does not have this check valve and is not as " discrete " a flow pattern

But it worked on the X300 in practical means

I had a drawn out pic on the X300/same X308 flow pattern somewhere
 

Last edited by Lady Penelope; 02-02-2019 at 01:04 AM.
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Old 02-02-2019, 12:21 PM
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Some years ago, I found a hose kit for the x300. Thought it was Amazon, but no record of it there in my past orders. Anyway, it was either $142 or $242, I can't remember. In either case, it included ALL coolant hoses, and was cheaper than sourcing them individually. Hoses #2 and #16 are the most expensive in the lot, Likely due to the funky ends where they connect together.

I've contemplated replacing 2 and 16 with a 4-WAY pvc pipe fitting and some standard 5/8" heater hose, but probably will target that project for the SpruceBruce $200 find, rather than either of the daily-drivers.
 
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Old 05-11-2019, 06:09 AM
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What is hose #16 called?
I’m about to cut that Norma connection off - fit with a new hose and standard connector - just curious what it’s referred to as Aholbro1
 
 
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