2000 V70 AWD 56 engine slow coolant leak

Post by **volvolugnut** » 22 May 2021, 08:28

Rocket99 wrote: 21 May 2021, 11:31 I would cross the country with that “ leak” , let alone a brief saunter down Route 5

now the coolant was one inch higher in reservoir that when cold after warming up on a trip to town.

Block tester fluid remains blue but I can see there is new volume added to the coolant space .

freaky looks very bad
[/quote]

I can't help myself adding explanation - the coolant expands when heated (and coolant expansion is greater than water only). This is why we have coolant expansion tanks.
volvolugnut

Post by **Chuck W** » 22 May 2021, 08:38

Yeah, I was going to note that too. Having it rise when warm/hot is normal.

Is the system holding pressure, long after shutdown? Quick test in the morning before the first start, open the reservoir cap and see if it vents any pressure. It shouldn't have any if the system is fully cold.

How long are you letting the car run with the block tester in place?

Rocket99 · Post by **Rocket99** » 22 May 2021, 09:13

Chuck W wrote: 22 May 2021, 08:38
How long are you letting the car run with the block tester in place?

5 min maybe, however the deed was already done ie engine had run for 40 min up a big hill so coolant was flowing and should have induced color change right away IF any combusion gasses were present.

Yes?

Post by **Chuck W** » 22 May 2021, 10:53

Maybe, unless it was a very small leak. You also might've vented most of it when you opened the reservoir after that run and things were hot. If it was already most up to temp, it shouldn't have taken too long.

Is the system holding pressure over-night? (Asked a couple of times and don't think you've said yes or no.)

Post by **kallekula** » 13 Jun 2021, 06:57

https://www.harborfreight.com/radiator- ... gK8QfD_BwE