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Old 08-07-2009, 03:49 PM
 
101 posts, read 325,339 times
Reputation: 49

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Hello everyone. Was wondering if you could help me out. I have a 06 pontiac grand prix and it is leaking coolant somewhere. I smell the burnt coolant but can't find a sign of a leak and I had to add coolant twice in the last 3 months.
I checked my oil and it looks fine no white in color, theres no white smoke coming out of the exhaust either. Theres no white residue around my radiator cap.
Any ideas would be greatly appreciated! Thanks!
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Old 08-07-2009, 04:22 PM
 
Location: Eastern Washington
12,097 posts, read 39,439,116 times
Reputation: 9302
If you have the 3800 V-6, they commonly develop intake manifold gasket leaks.

Another happy thought would be the heater core, take a look for any sign of coolant leaking out of the heater box.

Sorry to be the bearer of such great joy - but them's the facts as they are.
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Old 08-07-2009, 04:29 PM
 
101 posts, read 325,339 times
Reputation: 49
I do have a 3800 3.8L V6 but if it was the intake gasket wouldn't I get the milky substance in the oil?? Will check the heater box. Thanks!
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Old 08-07-2009, 04:31 PM
 
Location: Eastern Washington
12,097 posts, read 39,439,116 times
Reputation: 9302
I think the 3800 can leak coolant out of the intake manifold such that it goes outside the engine rather than inside. Not certain though.
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Old 08-07-2009, 05:50 PM
 
Location: Apple Valley Calif
7,475 posts, read 18,467,738 times
Reputation: 5538
2006 not under warrantee...?
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Old 08-07-2009, 07:58 PM
 
101 posts, read 325,339 times
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nope warranty was 3 year/36000 and im at 58k miles really stinks! Really praying its the water pump! But im thinking if it was the water pump and i've had this problem for a couple months now it would have went already right?? Thats another reason why I don't think its head gasket because I have had the problem for a couple months and no smoke, no milky white oil ect that should have shown up by now.. maybe its just a pinhole leak some where and its evaporating before it can get to the ground.. I do live in south FL and its been really hot down here.. I dunno I guess we will see
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Old 08-08-2009, 12:11 AM
 
846 posts, read 2,961,544 times
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If you had to add coolant that much in a short period of time, it's leaking somewhere.

The 3800 V6s are famous for head issues. It doesn't necessarily mean the exhaust must be puffing out dense white fog. It could be burned off before it gets out of the tailpipe.

Your best bet is to get the cooling system pressure-tested.
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Old 08-08-2009, 03:00 AM
 
Location: Unperson Everyman Land
26,675 posts, read 17,000,023 times
Reputation: 6882
Quote:
Originally Posted by mkearns View Post
Hello everyone. Was wondering if you could help me out. I have a 06 pontiac grand prix and it is leaking coolant somewhere. I smell the burnt coolant but can't find a sign of a leak and I had to add coolant twice in the last 3 months.
I checked my oil and it looks fine no white in color, theres no white smoke coming out of the exhaust either. Theres no white residue around my radiator cap.
Any ideas would be greatly appreciated! Thanks!
Waterpumps have weep holes. If the leak is small enough and only occurs under pressure, it could be evaporating away on the hot engine before it hits the ground. Also have the radiator cap pressure tested. It should hold to the specified pressure and allow pressure/vacuum relief in both directions. You may have to put extra pressure into the system with a hand tester to find it, but usually over pressurizing the system will expose the leak (proceed at own risk).

If the water pump can be eliminated as a possibility, add ground pepper to the system. That usually seals very small leaks.
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Old 08-08-2009, 07:40 AM
 
101 posts, read 325,339 times
Reputation: 49
Well just wanted to let everyone know it was def my water pump thank goodness! Don't know how I didn't notice when it went and am very lucky I didn't kill my car. Lol now I just have to get it to my mechanic
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Old 08-08-2009, 08:32 AM
 
Location: I think my user name clarifies that.
8,293 posts, read 21,260,238 times
Reputation: 3821
Quote:
Originally Posted by mkearns View Post
Well just wanted to let everyone know it was def my water pump thank goodness! Don't know how I didn't notice when it went and am very lucky I didn't kill my car. Lol now I just have to get it to my mechanic
Glad to hear it's the water pump. But geez louise, you should be getting 158,000 out of a water pump - not 58,000.

Mini rant: I'm amazed by the stupidity of the American car manufacturers. How many KNOWN problems have they knowingly ignored for years?
- The Chrysler Corporation continued to put faulty transmissions in their minivans for the better part of 15 years. They were KNOWN for being a bad tranny. And it would have been an easy fix, but Chrysler chose not to do it.
- The first generation 3.8 GM V6s were rock solid engines. But that wasn't good enough for GM. They had to "improve" them, and install how many tens of thousands of "improved" V6s that were KNOWN for their intake manifold problems. They did it for YEARS.

The list could go on and on...
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