Hi hope someone knows when driving the Blazer over heats. when I open the hood standing in front and looking right behind the alternator I see steam and bubleing coming from under the valve cover.
Isit a head gasket?
If so how hard is it to replace on a blazer? it's been many years since I've done one.

 

Do you have coolant in the oil? Is it coming from the valve cover or from the intake manifold gasket (they are very close together)?

 

No I don't think so it just looks like oil not milky or anything that was the first thing I looked for. When I look directly behind the alternatorright below the heater hoses (which was my first thought as to what was leaking) I could see the steam /bubbles coming from where the valve cover meets the engine.

 

It's probably the intake manifold gasket like mine, rent a pressure tester, pump it up about 10-12# see if you could seethe leak, look below the truck as well, try to track it down that way.

 

I can see the leak as soon as it gets hot. It's on top passenger side right next to the valve cover.

 

If that's what it is how hard is it to replace? How much would it cost to have someone do if I don't have the time?

 

Do a search on ; intake gasket replacement, there you'll find pricing, tips on do it your self tips w/illustrations, ect..

 

Thanks Salvy good info.