Oil cooler lines leak 98 volvo v70xc Topic is solved

Switchemlee · Post by **Switchemlee** » 13 Apr 2017, 17:43

Will blue devil stop oil leak help for the oil cooler lines? 98 v70xc thanks for any suggestions

Post by **erikv11** » 13 Apr 2017, 19:40

I don't know that particular product but I don't think there are any that will help leaking oil cooler lines. Replace or rebuild the lines is the only sensible way to go. Or just let them leak.

Post by **FlyingVolvo** » 13 Apr 2017, 20:08

Stop-leak products are already usually questionable in their effectiveness. Even then, they're generally designed for leaking seals, not actual hoses. If you're sure the leak is from that hose (or hoses), I would replace them. Genuine is the best way to go, but they are pricey. There may be aftermarkets available, but you tend to get what you pay for.

Wouldn't hurt to clean the entire under body of the car and double-check the source of the leak. It would suck to replace something you don't have to.

Post by **cn90** » 13 Apr 2017, 20:31

1+,

Oil Cooler lines leak either at:
- O-rings
- Crimp

To rebuild: use good oil hose (Gates etc.) and new Oetiker clamps. Info on rebuild is in forum.

Switchemlee · Post by **Switchemlee** » 13 Apr 2017, 21:14

Ok thanks a ton was just curious to if it would work. Guess im gonna grab the genuine volvo oiler cooler lines off of fcp and get to work ASAP. Just didnt want to pay the price for them lol.

Switchemlee · Post by **Switchemlee** » 13 Apr 2017, 21:16

Not really into the whole letting them leak thing haha i like to keep things all in check

Post by **erikv11** » 14 Apr 2017, 08:21

Switchemlee wrote: ↑13 Apr 2017, 21:16 Not really into the whole letting them leak thing haha i like to keep things all in check

That's good, I agree! I was just trying to emphasize that letting them leak is a better alternative than putting in any stop leak product.

I see you posted in this thread, it's one very good way to go: viewtopic.php?f=7&t=53362&start=10. Let me know if you have trouble getting ahold of him though MVS, I have his email address. Last I heard he was still making the lines.

The cooler lines are a total PITA to replace, have patience with the gasket on the oil cooler thermostat.

Post by **cn90** » 14 Apr 2017, 08:57

Rebuild the lines yourself. Info in forum. Basically:
- Remove factory crimps (dremel it out).
- Install new hose (Gates etc.).
- Install new clamps.

Of course, new Volvo O-rings...

Post by **tryingbe** » 14 Apr 2017, 12:47

Use only oil cooler hose, not coolant hose.

Post by **scot850** » 14 Apr 2017, 14:26

Clean off all the oil if it is on the cooler lines and then monitor as to where the leak(s) are coming from. If it is only at the oil cooler thermostat it is probably the small retaining plate has warped and has allowed the "O" rings to move and oil then to leak.

Sometimes if you are very lucky, simply removing the plate (fiddly as it uses a small Torx screw seated between the pipe ends) remove the plate, and reverse it or, try to flatten it and re-fit.

If it still leaks at that point replace the 'O' rings on the ends of the 2 cooler lines. I strongly recommend removing the thermostat to allow access to the 'O' ring seats as built up old oil can cut the new rings as you try to re-fit. I found this out after the dealer tried to fix the leak twice and then told me to replace the pipes as they were worn out. I did ask how a non-moving part can wear out at an 'O' ring. I had replaced the pipes from the top and it was only when I got to the thermostat end I checked it with a small mirror and saw the oil build up. Removed the unit to give good visibility (new gasket required), carefully scraped and cleaned the carbonised oil out, and reassembled and all was good.

Straightened the retaining plate and re-used and all was good. Thought about removing the hoses again and returning them as the old ones, while old, were still good. The hassle is removing and re-fitting the bolt at the front of the block where the 2 pipes have a locating bolt.

This took a lot of strong engineering language, patience (not a strength) and remembering the bolt angles slightly downwards into the block and you have to fit it mostly by feel.

Good luck.

Neil.