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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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Update on overheating issuesViews : 1147 Replies : 22Users Viewing This Thread : |
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Feb 21st, 2020, 19:23 | #11 |
Master Member
Last Online: Mar 26th, 2024 23:41
Join Date: Oct 2013
Location: Alberta
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Best to replace the pump with a cast metal impeller, not the stamped sheet metal impeller. The cast impeller is known to provide better circulation at idle and is the OEM type.
Another thing I did when flushing was take the drain tap fully out of the block, the one rearward of the oil filter and blow compressed air in there. You might be surprised as to how much crud it loosens up. Flushed several times with garden hose on thermostat opening and reverse flow with garden hose (with a spray nozzle on the hose) in the drain tap hole. More crud. Good luck. |
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Feb 23rd, 2020, 11:57 | #12 |
66 Amazon
Last Online: Jun 14th, 2022 17:45
Join Date: Jun 2013
Location: Piegut Pluviers
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OK having taken Derek's advice I jacked the front of the car up high and ran it with the heater valve open. The car got nice and hot so I tried the heater, cold. I let it cool down but noted the two heater hoses were not warm. Removing them reveled no water in the hoses but some in the metal heater radiator pipes. I thought I would be clever and fill up the two hoses but this just caused the water to go down the overflow pipe. I am thinking the heater radiator may be blocked so will try and flush that out before I go any further. Could someone kindly take a picture of the hose layout to the heater for me, they went back as they came off when I changed the head but there is no guarantee they were on right in the first place as the previous French owner was a bit of a bodger when it came to mechanicals I discovered.
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Feb 23rd, 2020, 13:28 | #14 |
66 Amazon
Last Online: Jun 14th, 2022 17:45
Join Date: Jun 2013
Location: Piegut Pluviers
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Thanks for the picture mate much appreciated.
Just a question from the image, does the hose from the base of the heater matrix go to the L shaped pipe on the head or to the red metal pipe down the side of the head. Difficult to see on the pic. |
Feb 23rd, 2020, 13:45 | #15 |
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Last Online: Mar 26th, 2024 18:32
Join Date: Apr 2012
Location: Droitwich
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Pipe from bottom of matrix goes to the L shaped bracket, hose from the other pipe goes to the valve. It's no wonder you couldn't tell from the pic, it's hard enough to see from 6 inches away!
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Feb 23rd, 2020, 14:44 | #16 |
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Last Online: Today 09:52
Join Date: Jul 2007
Location: Connecticut, USA
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niveketak;
That hose routing sounds correct, but if Cooling Sys is hot and you get no heat from Heating/Defrost Sys (presumably when Heater Control Valve is set to warm), that confirms a blockage in that path...typically HCV or Bowden Control cable to same, but ANY blockage would obviously lead to the same result. Correct Heater/Defrost Sys hose routing: https://www.sw-em.com/Cooling_System...efrost_systems Hose routing is actually not critical for cooling, and improper routing by itself is unlikely to cause overheating... Good Hunting! |
Feb 23rd, 2020, 14:57 | #17 |
66 Amazon
Last Online: Jun 14th, 2022 17:45
Join Date: Jun 2013
Location: Piegut Pluviers
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No blockage found as yet all seem to run free so still fiddling!
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Feb 23rd, 2020, 21:55 | #18 |
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Last Online: Today 09:52
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Location: Connecticut, USA
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...or if Heater Control Valve is open and there's no Coolant flow, a big bubble where we would want Coolant! I recommend you burp your system!
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Feb 24th, 2020, 09:06 | #19 |
66 Amazon
Last Online: Jun 14th, 2022 17:45
Join Date: Jun 2013
Location: Piegut Pluviers
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How on earth do you burb a cooling system Ron? On that subject though, yesterday the heater hoses were getting hot but, the temp gauge was up towards max and there was the sound of over pressuring which would mean you are probably right I think. If you can break down the "burp" scenario I would be happy to have a go it is getting very frustrating at the moment.
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Feb 24th, 2020, 09:52 | #20 |
Premier Member
Last Online: Oct 23rd, 2023 22:39
Join Date: Apr 2007
Location: EXETER
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Another basic question from me!!!
When you say the thing is overheating, what do you mean exactly?
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