I just finished my intake manifold gasket replacement and when I was underneath loosening the power steering/AC bracket I saw evidence of leakage around this part. It looks like part of the engine oil cooler, but the one big round part baffles me. I can't really tell where the leak is coming from.

Has anyone else had problems with this and found a solution?

Thanks

Dan

 

I'm not sure where you see a coolant leak. What year is your Blazer?
More info would be nice.

 

I'm not sure what 'big round part' you mean. What leak? The engine oil cooler normally is in the radiator. The engine oil filter lines show signs of a leak or something on them.
More info would be good like 4x4 asked.

 

It's a 99 or newer and the "big round part" is the secondary air pump. I don't see any coolant leaks either BUT, the coolant overflow tube might be "aimed" in that direction.

 

Isn't the coolant overflow located on the PS?
I know on my '02 it is & the oil filter relocation isn't anywhere near it.
I wonder what year they stopped having the secondary air pump.
I suppose 'aimed at it' & the coolant running along other parts could be possible. The overflow isn't under pressure per say, it's just a tube from the top of the reservoir.

 

Yes, the coolant reservoir in on the passenger side inner fender and the air pump is under the passenger end of the radiator. The hose is supposed to run pretty much straight down, but sometimes they get "repositioned" for whatever reason

 

That's the air pump? It looks to be on the DS?! Isn't that the tensioner pully above it?
<edit> I'm trying to remember which way my oil filter faces. After thinking about it I think it does face the DS. Oops lol & the tensioner is on the PS. That upward view messed me up.

 

Check out the oil filter, it points to the driver side. And the leaky oil lines head off to the driver side of the engine. You're right about the tensioner, and it's on the passenger side as well

 

Lol thanks about the tensioner, I've loosened the belt enough times to remember that. As for the position of the oil filter - it's amazing as many times as I've been under that truck with the plastic air dam off I can't be 100% on it's position other than I know the housing for it is broken, broken bolt lobe.
Yeah noticing the tensioner should have made me smarten up.
I don't have an air pump on mine so I have nothing to relate it to.

 

It's an 01.

It's not coming from the overflow. There are coolant lines coming into all of this. I just can't pinpoint where the coolant is leaking from.