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Old 09-06-2020, 01:31 PM   #1
Moike
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Question Heat hose routing

I had an issue with one of the hoses from the heater core popping during the cars emissions testing before lockdown around 6 months ago and am now just getting off my arse to sort it properly. However I cannot work out for the life of me the correct order & routing of the coolant hoses including the heater valve. Car is a turbo 940 in RHD with the B230FK engine and it had AC from the factory.

I believe the coolant should flow from the outlet under the cylinder head to the bottom of the heater core. from the top of the heater core it should connect to the long metal pipe that runs behind the head to the oil cooler. Is this right? Where should the valve go in all this?

I've done a lot of searching and can't find a diagram that makes sense and shows the valve to try and piece it together myself. Does anyone have a diagram even for a LHD car i can use?
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Old 09-06-2020, 04:08 PM   #2
iamrolling
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Here is the one from my car, but it's an LHD car with the B230FT. Might be the same.
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WARNING: I am not a professional mechanic, and you should only base your repair decisions on my advice if I'm not corrected by someone who has worked on more than a few Volvos.
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Old 09-06-2020, 04:41 PM   #3
Moike
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oh that is quite helpful. Shame it doesn't tell you exactly which part is the heater valve but it looks like part number 59 to me.

If thats the case that would put it between the outlet from the head and the inlet to the heater core by my reckoning. its a bit of a pain as that means the pipes have to come out of the block, cross the engine bay behind the engine then double back on themselves to meet the metal return pipe. no wonder why the RHD hoses are expensive if / when you can find them...
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Old 09-06-2020, 11:20 PM   #4
hessam69
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What is your email address I will show you a picture
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Old 09-07-2020, 03:09 AM   #5
MasterBlaster
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Here's the best I could come up with from my 740.

I was just about finished making a CAD-worthy drawing, when suddenly a passing mse trampled on my computer, so this diagram has been completed in an entirely different style at great expense and at the last minute.







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Old 09-07-2020, 03:30 AM   #6
hessam69
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I think that would be correct.
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Old 09-07-2020, 03:33 AM   #7
iamrolling
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MasterBlaster, that's beautiful. I saved it for when I get around to installing a heater core.
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Old 09-07-2020, 04:56 AM   #8
Moike
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Thats bob on! thank you so much. I'll get it all plumbed up later and let you know if it does the trick.
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Old 09-08-2020, 03:27 AM   #9
Moike
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Managed to get everything plumbed up using the diagram supplied by MasterBlaster. Amusingly, and perhaps not entirely a surprise to most, the heater valve decided to snap as I was tightening the last hose clamp. New one is being ordered now and I should be back on the road soon.

Thanks to those that contributed.
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Old 09-08-2020, 05:04 AM   #10
hessam69
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Be glad it happened then and not on the highway. Preventative medicine is the best cure
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Old 09-08-2020, 11:30 PM   #11
MasterBlaster
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Quote:
Originally Posted by Moike View Post
Amusingly, and perhaps not entirely a surprise to most, the heater valve decided to snap as I was tightening the last hose clamp.
They do that.

The one I got with the car in Feb 2009 started leaking, so I replaced it along with all new heater hoses in Mar 2010.

August 2011, this happened:



Woo-hoo!!! Lasted a whole 17 months.

Another new valve in.

June 2016 this happened:



Eh, 5 years.

Number 4 is still in there, for now.............
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