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Smell coolant in the car..

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Turbo6Smackdown

Well-Known Member
Joined
Dec 31, 2005
Messages
6,110
Ok, here's the situation. When I turn on the defrost, the windshield fogs up immediately, and I smell coolant, bad. Classic signs of a leak in the heater core. Got that.
Though, if I keep the heat level to cold, and the entire system off, I smell zero coolant. Until I get into boost. I'm thinking, is boost making my cooling system leak? Then, I try to bring the car up to freeway cruising speed (70) without touching the boost at all. Now I do get the coolant smell a little bit then, but not nearly as much as when I get into a boost condition. So I started to think, is this just the water pump moving faster, and exacerbating this leak I have?

Then I come across the 2nd post in this thread:
http://www.turbobuick.com/forums/engine-tech/333105-need-someone-weld-my-heads-block.html

And I thought ****.......
Tell me what to look for next....
 
The reason is goes away is because when you turn it to cold the heater control valve in the heater core lines shuts. Yes with RPM pressure is probably building in the system (it's supposed to, up to a point) and it probably starts dripping again (the core stays pressurized, the valve just keeps water from flowing through it).

Bottom line, put a heater core in it all the rest you are talking about is just confusing the issue.
 
1st thing I replaced, heater core. Same problems you are having.
 
The reason is goes away is because when you turn it to cold the heater control valve in the heater core lines shuts. Yes with RPM pressure is probably building in the system (it's supposed to, up to a point) and it probably starts dripping again (the core stays pressurized, the valve just keeps water from flowing through it).

Bottom line, put a heater core in it all the rest you are talking about is just confusing the issue.

Yea. I got that part lol. Thanks. I was already aware of that problem. My question was, why do I never smell it, until my rpm's go up? Could I be pressurizing my coolant system, from a faulty headgasket?
 
Yea. I got that part lol. Thanks. I was already aware of that problem. My question was, why do I never smell it, until my rpm's go up? Could I be pressurizing my coolant system, from a faulty headgasket?

Check your overflow tank...If it's building that much pressure it'll overfill the tank.
 
Nope. Nothing unusual goin on in there. Though, wouldn't it just push it out of the leak? Or INto the leak? (head)
 
1st thing I replaced, heater core. Same problems you are having.

Heater core needs replacing....same situation I had with the Vettes...problem solved after replacing the #*&# heater cores. On the Vettes...a bitch....on the GN, not too hard.

Bruce '87 Grand National
 
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