Over Heating Volvo V70 Diesel? Or is it...

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.

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

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?

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 .

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.

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

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... )