Paul Y
Posted a lot
Posts: 1,948
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Jun 27, 2017 21:18:21 GMT
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Evening all. Whilst not new to Volvo ownership, owned a pair of 850 T5r's and a V70R in the 90's, I have recently return to the fold with a 98 V70 2.5D auto purchased from this very forum. So, seem to be experiencing a weird overheating problem. On the motorway and at speed, rock solid in the middle of the gauge. Traffic, all ok. But driving slowly the temp rises quite quickly to the top of the gauge, not in the red. It will then quite quickly drop down again when off the throttle. Go back to speed and the temp drops down and I can do a long trip with the gauge in the middle. This is a recent change by the way. Apparently had a recent water pump and thermostat. No loss of water, no mayonnaise in the oil. Fans kick in. Temperature gun shows no hot spots on rad. Any ideas? Or should I take it to a specialist and let them have a look or have I missed something? Any advice appreciated. Many thanks. P.
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Paul Y
Posted a lot
Posts: 1,948
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Jun 27, 2017 21:59:08 GMT
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Quick update. Just went for a 20 mile trip to pick #2 son up from work. Car comes up to temp pretty quickly and as it approaches the red there is a definite loss of power. Limp mode? But...had occasion to turn on the heater for the first time in 3 weeks of ownership and it blows cold even at full. Now thinking air lock or fault thermostat? Any views from the gallery? P.
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Jun 27, 2017 23:03:32 GMT
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I had this on My old 850 t5 would do the same thing Was a stuck thermostat
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Jun 28, 2017 20:02:17 GMT
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Thermostat gets my vote also. New doesn't mean good. The OE ones, for the Audi at least, are made by Wahler, have a rubber seal, work extremely well and cost alot (£ 30). The aftermarket "equivalents" are about £ 6 but don't work that well.
Mine has the opposite problem. It NEVER, ever warms up quickly, even with a new Wahler thermostat. It struggles to hold temperature on long downhills in winter. If I don't fit a Whaler thermostat with rubber seal it never fully warms up.
Presumably, if it had a new water pump it had a new timing belt and tensioner too?
Nick
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1967 Triumph Vitesse convertible (old friend) 1996 Audi A6 2.5 TDI Avant (still durability testing) 1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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Paul Y
Posted a lot
Posts: 1,948
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Jun 28, 2017 22:15:20 GMT
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Hey Nick, Yup new belt and tensioner fitted along with pump belt and t stat. Guys on the Volvo forum seemed to think it might be an air lock but why when it has been good for 4000 miles.... Anyway, T Stat ordered, new anti freeze and a session with the hose to wash everything out and we should be good to go. Either that or I have done the head gasket.... Watch this space! P.
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Stu
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Posts: 2,913
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Jun 29, 2017 10:34:58 GMT
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My 850 T5 had the opposite issue (I think) where temp gauge was too low (and heater cold) at speed, but fine around town. Fitted a new genuine thermostat and Volvo green coolant top up which sorted it.
I'd definitely change your thermostat, flush the cooling system and bleed it, but are you sure the water pump is working as intended? Symptoms sound more like a pump impeller that isn't connected to it's shaft correctly so cooling appears ok at speed (lots of air rushing in) but coolant not circulating correctly at lower speed when the pump is needed more?
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'89 BMW E30 325i Sport, '04 MINI Cooper S, '09 Volvo V70 D5
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Paul Y
Posted a lot
Posts: 1,948
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Jun 29, 2017 15:49:28 GMT
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Thanks Stu. Had a new waterpump fitted 20K ish miles ago, worth checking whilst it is apart though. T Stat in tomorrow and working from home so will throw it in late afternoon and report back. P.
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ChasR
RR Helper
motivation
Posts: 10,194
Club RR Member Number: 170
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Jun 29, 2017 16:11:09 GMT
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Thermostat gets my vote also. New doesn't mean good. The OE ones, for the Audi at least, are made by Wahler, have a rubber seal, work extremely well and cost alot (£ 30). The aftermarket "equivalents" are about £ 6 but don't work that well. Mine has the opposite problem. It NEVER, ever warms up quickly, even with a new Wahler thermostat. It struggles to hold temperature on long downhills in winter. If I don't fit a Whaler thermostat with rubber seal it never fully warms up. Presumably, if it had a new water pump it had a new timing belt and tensioner too? Nick This. However, I've started getting more stuff from the stealers lately. Generally because for the right part they are actually not that much pricier in a number of cases. For my M3 I bought some Textar pads from a well known European Car Parts seller. BMW only sell one set of pads for the M3 ; they also fit the E39 M5, X5 of the same era (I think the 4.4i) and the Z4M. The 330i pad is the same physical size. I'll let you guess which pads I got. Textar do sell the correct ones but they are not that much cheaper from BMW when compared elsewhere. With the stealer stats on my BMW I've never had an issue .
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Last Edit: Jun 29, 2017 16:11:37 GMT by ChasR
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Paul Y
Posted a lot
Posts: 1,948
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Jun 29, 2017 18:15:09 GMT
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Learnt a very expensive lesson a few years back when a new race engine destroyed itself due to a £5 patten part thermostat... £33 invested with my local Volvo dealer for a 'proper' T Stat... Fingers crossed that this cures it (pretty sure it is this as top hose hot, bottom cold, heater blowing cold and lots of movement in header tank - or I have done the headgasket....) Watch this space! P.
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Paul Y
Posted a lot
Posts: 1,948
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Jul 16, 2017 19:36:42 GMT
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Update. Just didn't have time to look at this for the past 2 weeks so waited until my friendly neighbourhood Wayne had some space in his shop to give the Whale the once over. Sniffer used to confirm head gasket all good. Cooling system drained as it was, in his words, full of curse word. Thermostat replaced with Volvo one as the 'curse word' was making the old one stick. Still not right. Problem traced to the bleed pipe off the top of the head being blocked by the aforementioned 'curse word'. cleaned out and now all good. Did require a pressure bleed to make it so, going to run it for the next week then take it back to have the system flushed again and topped up with antifreeze. Good news is that the water pump is all good as are the belts and a general look over on the ramp seems to indicate that the whale is pretty solid. Now it is back in daily service I can get on with sorting out the niggly little rattles and squeaks. Thanks for all the advice! P.
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ChasR
RR Helper
motivation
Posts: 10,194
Club RR Member Number: 170
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Jul 16, 2017 21:54:33 GMT
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Another area where interweb diagnoses failed, well, ish I gues.
You have to love people putting in the world's supply of K-seal to fix the problem.
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Jul 19, 2017 11:39:02 GMT
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Another area where interweb diagnoses failed, well, ish I gues. You have to love people putting in the world's supply of K-seal to fix the problem. The K-seal (or whatever) may even be fixing a problem, so successfully it remains undiscovered. Just that it's side effects have been discovered....... Nick
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1967 Triumph Vitesse convertible (old friend) 1996 Audi A6 2.5 TDI Avant (still durability testing) 1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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ChasR
RR Helper
motivation
Posts: 10,194
Club RR Member Number: 170
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Jul 19, 2017 12:37:13 GMT
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I only speak of it as I once bought a car where it seemed it only had K-Seal and water in it for years. I've not own many cars more unreliable than that! Mind you, it was covering 10,000 miles a month for some time...
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jasone
Part of things
Posts: 18
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Jul 25, 2017 19:14:03 GMT
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Evening Paul! Did a bit of stalking to see how the Volvo was getting on. Got a bit worried when I saw the start of this thread, but sounds like you found the source of the issue you had. Shame I didn't find this thread before! I replaced the thermostat when I first got it as it was running cold, so could've saved you that issue! I wonder if the air lock was after that hose went on me? Odd. Either way I hope she's serving you well (sorry mods if this has hijacked a thread... )
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Last Edit: Jul 25, 2017 19:14:27 GMT by jasone
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Paul Y
Posted a lot
Posts: 1,948
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Jul 30, 2017 19:45:20 GMT
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It's all good Jason still very happy with my purchase. Done just over 6000 miles in the 2 months of ownership and that includes 2 weeks when it was sat on my drive! Problem sorted. Just wound the front up by an inch as it was running out of shock travel but other than that and some routine maintenance been perfect. Don't think it is really worthy of a thread. P.
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