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Looking for where coolant leaks


puter's Avatar
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04-14-05, 08:37 PM   #1  
Looking for where coolant leaks

1998 Chevy Lumina 3.1L V6 156,000 miles. It had an intake gasket leak a few months ago. Paid about $450 and repaired. Now 6000 miles later, coolant is leaking again. Coolant reservior empties in 1000 miles. checked around the water pump. Radiator cap and oil refill cap are clear of oily muck. No coolant smell. Apparently, leak just started.

I know AutoZone loans pressure setup that sits where radiator cap is. Is this worth trying? Thank you.

 
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04-14-05, 09:09 PM   #2  
fishslayer1986
If you can't find a leak anywhere around your engine, you could have a head gasket leak. If your exhaust smells sweet, that could be an indication as to if you do have a head gasket leak. We have a slow head gasket leak on our suburban. See if a leak stop might help.

 
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04-15-05, 04:56 AM   #3  
Thanks. I will try stop leak and check exhaust smell.

 
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04-15-05, 06:08 AM   #4  
The 3.1 has a nasty habbit of leaking, not through the head gasket but out the lower intake manifold gasket (LIM). Known problem the GM is aware of, they have redesigned the gasket 3 times, still leaks. Look into that.

 
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04-15-05, 06:16 AM   #5  
Does V6 have 2 intake manifolds? Since previous repair was for intake manifold gasket, is this leak from the other?

 
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04-15-05, 03:00 PM   #6  
Upper and lower

 
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04-16-05, 04:28 AM   #7  
Yes it's possible to get a repeat intake leak in a short period of time.Overtorquing of intake gaskets is very common.They are low clamp load design gaskets and overtorquing damages them.Also new bolts are to be used and there is very specific torque directions that need followed for the repair to last.Yes try pressure testing the system if you can get the tool.

 
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