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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Volvo 940 radiator leaking - what are my options?Views : 1663 Replies : 25Users Viewing This Thread : |
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Jul 1st, 2020, 17:57 | #21 | |
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That's why i always advise a course of part-changes on ATF rather than the flushing method. As for using OAT coolant, i daresay you've rebuilt the engine a few times with new gaskets? They are usually the first to suffer from OAT coolant as most gaskets won't resist the acid. Next, the acid will attack the cast iron block a lot more than ethylene glycol will attack the aluminium head. Additionally, most people won't flush the system properly when changing coolant, even if they think they have. Refilling a previous ethylene glycol system with OAT will cause the formation of silicone plugs because the acid will cause the silicates present in EG to precipitate out of suspension and form a gel which then blocks various waterways inside the block, head and anywhere else. Setting aside the fact OAT will attack the block and potentially the gaskets in a 940, the fact most people won't strip, clean and dry every cooling component in the system before changing to it or at the very least, flush it forwards, backwards and then flush it again to ensure all the EG is removed, it's safer to simply say don't use it. Factor in the damage the acid in OAT will cause to the cast iron block and it's a case of don't use it.
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Jul 3rd, 2020, 10:21 | #22 |
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I changed the 940 HG maybe 15+yrs ago after I diluted out the coolant with water, due to a leaky rad, probably used oats then, it's all you can get in Halfords I think. Does leak a little around the rubber seal to the water pump. Might do a wee refresh on it check bearings mainly, now it's a bit rough and past 200k.
The 360 has lost some compression in 1 cyl but I think that was down to running too much boost on STD mgt. Currently stripping. |
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Jul 4th, 2020, 12:29 | #23 |
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I did a full cooling system overhaul on my 940 this January. Probably one of the easier jobs to do. I replaced all the rubber hoses in the engine bay with genuine Volvo ones, thermostat with 82' genuine volvo, water pump with SKF one off ebay, radiator with Nissens one. Seals and gaskets from Volvo and new stainless steel jubilee clips all round. New expansion tank and cap too from Volvo, genuine volvo coolant as well.
I flushed a good 10 loads through the system and back flushed through the heater core and block etc. A lot of grim gunk came out of that as I don't think it had been done in a long, long time! I had a pretty serious leak as well which I couldn't pinpoint, turned out to be the oil cooler hoses. They looked good outwardly but actually they were completely destroyed and split open once you applied pressure to them (think chinese finger trap), it explained why the system would leak enormously when filled up but then stop and never really go down beyond a certain level. It does look like these parts are being run down stock wise though! My radiator was under £60 when I bought it and I see they are up to £100 now on ebay. Also all the rubber hoses were still in stock but were special order from the "Volvo Classic Parts" warehouse in Sweden so took a while to arrive. They were all top quality, genuine hoses made in Sweden or Poland and were Codan branded for the most part. I got all the genuine bits from FRF in Swansea and was under £200 delivered for everything! It's still such a novelty to open the bonnet and see the lovely blue green coolant and that the level hasn't changed since I last looked!
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Jul 5th, 2020, 00:23 | #24 | |
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But it is possible to repair a 940 radiator. Years ago, I drove my 940 onto what appeared to be the grass verge by the side of a French country lane. In fact it was a ditch full of long grass and leading into a concrete culvert. So an aluminium wheel with a bent rim (corrected with some blows from a lump hammer), a bent track rod, and coolant leaking from the radiator, which had made contact with the concrete. I removed the radiator and freed the plastic part at the side by opening the aluminium fingers that held it in place. After doing my best to straighten the aluminium, I got it all clean and dry and then coated the face liberally with silicone gasket sealant. Then I put the plastic part back in its place and bent the aluminium fingers back to hold it correctly. A bit to my surprise, and my relief, there was no leakage of coolant. A couple of years later I bought a replacement radiator. Eventually, when I had the timing belt and water pump replaced by the local garage, I asked him to fit the new radiator at the same time. The garage owner gave me the bill, which did not mention the replacement of the radiator. He said that they remove the radiator to replace the cam belt so the replacement of the old radiator by the new one was included in the price and involved no extra charge. That was in about 2009. The replacement radiator, which I think was Nissens, has given no problems. Skandix list the radiator for manual transmission 940 at about 200€ but there are plenty of suppliers on Ebay offering 940 radiators for less than £100. cheers Martin |
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Jul 5th, 2020, 11:43 | #25 | |
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Jul 8th, 2020, 15:40 | #26 | |
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For anyone looking for the right Nissens part this is a good place to start - very comprehensive catalogue with part numbers and Volvo equivalents https://catalogue.nissens.com/Product
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