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XC90 '02–'15 General Forum for the P2-platform XC90 model |
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Heater - No flow into heater D5Views : 1616 Replies : 10Users Viewing This Thread : |
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Jun 12th, 2018, 15:06 | #1 |
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Heater - No flow into heater D5
Vehicle is a 2007 XC90 D5, Australian delivered.
Wondering if anyone has had an issue where no coolant is flowing out of the engine into the heater core? Long story short, heater went cold with only minimal heating and started to investigate - it does get to 7 degrees in the winter here you know, brrrr! Undertook a comprehensive clean of the heater element thinking it was blocked and have now concluded flow through the core is perfect. Turned heater knobs in cabin to hot first although as the system is a full flow can't see what that would do but did it anyway. Then fabricated long hoses to route the heater inlet from the engine into a bucket and from the bucket into the heater return into the engine and ran the engine making sure the expansion tank didn't run dry. Result of this was that there was no flow out of the engine - well a trickle at most which was hot but there was nowhere enough of it to circulate around the heater core and heat the air. Interestingly flow increased to the heater when i took off the expansion tank cap and basically stopped when i sealed the system by putting the cap back on. So, anyone know if there is any sort of heater control valve or flow obstruction device up stream of where the heater feed goes into the heater core? I have a submersible USB inspection camera ready to send to perform a colonoscopy of the heater hose that feeds the heater core to see what's up there and if there is anything blocking it. Only other thing I can think of if there is any connection to the heater supply from the thermostat? As an aside, to clean the heater element I bought a $45 pond pump, low pressure and connected to the inlet of the heater core and the return into a 20l bucket. Used a liberal portion of CLR (calcium, lime and rust) dissolver and circulated for a few hours. A few bits of calcium flake came out but overall very clean. Ran clean water from the hose through it to make sure none of the CLR was left in the system and now confident it is as good as new, pic's attached. Thanks |
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Jun 12th, 2018, 16:53 | #2 |
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Is the car still on the original timing belt driven coolant pump?
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2002 S60 SE D5 Manual 209000 miles |
Jun 13th, 2018, 00:36 | #3 |
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Yeah still the original water pump, at 198,000 km’s. Changed the belts at 130,000km’s but didn’t do the pump as thought that can wait till I do the belts again soon. Are you thinking that the impeller has spun off or something? The car in all other respects is fine and handles the hot WA weather here no problems so can’t imagine the water pump isn’t working. Always had factory coolant in it as well so corrosion should not be an issue.
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Jun 13th, 2018, 01:21 | #4 | |
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To aid with finding a possible flow restriction, this is the cooling system description from Vida for the D5244T4 engine.....
Quote:
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2002 S60 SE D5 Manual 209000 miles |
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Jun 13th, 2018, 01:25 | #5 |
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No. If the pump is the original, that would be the last thing I would consider causing a problem.
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2002 S60 SE D5 Manual 209000 miles |
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Jun 15th, 2018, 07:39 | #6 |
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Thanks a lot for the VIDA run down of the cooling system. I am in the process of finding pictures of the engine on the net and re-creating the flow based on the description above. Not easy but should be able to put it together.
1) The shut off valve located in the inlet pipe from the thermostat housing to the expansion tank and 2) The The bypass valve located between the coolant outlet on the cylinder head and the feed line to the coolant pump are the first things I will start looking into. As these are both controlled by the ECM there could be an issue with that although I will start with mechanical issues first before going down into the electronics. Temp sender also provides input so may look into that but there is no other indication of issues with this. If I read the description correctly the thermostat is independent of the water circuit that feeds the heater element so will leave that alone for the time being. An pain but an interesting problem that I am keen to unravel. |
Jun 15th, 2018, 09:19 | #7 |
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OK, had a good look around and I am none the wiser as to what and where the coolant shut off valve and the coolant bypass valve are in the system. An extensive internet search reveals not a lot but did manage to get some good images so if anyone can point me in the right direction, please feel free to point them out in the attached photos.
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Jun 16th, 2018, 07:18 | #8 |
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Maybe there is quite some lime deposits from a previous owner using tap water, which would block the flow from circulating properly.
Maybe try a Prestone flush mixed with distilled water (we get this water from pharmacies here), read the instructions by peeling the sticker off the bottle https://www.amazon.com/Prestone-AS10.../dp/B00B99U088
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Several Volvo Repair Videos https://www.youtube.com/playlist?lis...ECTts0FSVSOT_c |
Jul 12th, 2023, 02:19 | #9 |
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What was the outcome? Solved?
I just changed the heater matrix in my 07 XC90 D5 Auto. Got the car hot. Ali pipes to matrix were stone cold. Pipes to bulkhead in engine bay were hot. Alas, no hot air in cabin. Pulled the ali pipe from matrix and nothing but air! WTF? |
Jul 12th, 2023, 13:44 | #10 |
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Our MY2005 is pretty much the same - heater never heats enough to defrost the windscreen if left idling, however, drive it a mile and the heater is roasting.
I have flushed the whole system a couple of times, thermostat and water pump changed... no difference. Just live with it now.
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