Antifreeze smell

43
10
8
Buick Ownership
2011 Buick Lacrosse
Hello I have not been the first to ask this question but could it be the antifreeze smell coming from a leak in the intake manifold/gasket. I couldnt find any leaks anywhere else, not the floorboard, around the radiator, pipes.
2011 buick lacrosse 3.6
 

Rich B.

Active member
300
50
28
Minot, ME
Buick Ownership
2016 LaCrosse & 2013 Boss 302 Mustang
Not good. Only turbocharged car I ever owned kept blowing head gaskets, antifreeze would leak into a cylinder and burn. Had the sweet smell exhaust and radiator would pressurize with exhaust also. That cylinder was burning way clean with the water addition. Reminds me of water injection system, for another post someplace (yup, it works but not practical).

Cure was to install copper head gasket w/hi-temp gasket spray. Those are used for racing applications and will actually increase compression ration as thinner that conventional head gaskets. Also retorqued head bolts higher than specs called for.
 

2007LucerneCXL

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Illinois
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2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
Here's one posting that will have options to review. There isn't one answer for this as it may appear on multiple area's, the only way is to check and eliminate them one by one or have a service shop do an inspection. Check out the forum and you will see that a number of these leaks are listed and repaired, but not on the same location.

2012 Buick LaCrosse - DexCool Coolant Leak
 
43
10
8
Buick Ownership
2011 Buick Lacrosse
Here's one posting that will have options to review. There isn't one answer for this as it may appear on multiple area's, the only way is to check and eliminate them one by one or have a service shop do an inspection. Check out the forum and you will see that a number of these leaks are listed and repaired, but not on the same location.

2012 Buick LaCrosse - DexCool Coolant Leak

Thanks I will check for the leak on the passenger side. But the smell is strong on the driver side.
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43
10
8
Buick Ownership
2011 Buick Lacrosse
Not good. Only turbocharged car I ever owned kept blowing head gaskets, antifreeze would leak into a cylinder and burn. Had the sweet smell exhaust and radiator would pressurize with exhaust also. That cylinder was burning way clean with the water addition. Reminds me of water injection system, for another post someplace (yup, it works but not practical).

Cure was to install copper head gasket w/hi-temp gasket spray. Those are used for racing applications and will actually increase compression ration as thinner that conventional head gaskets. Also retorqued head bolts higher than specs called for.

Yeah not practical but good to know.
 
43
10
8
Buick Ownership
2011 Buick Lacrosse
Has anyone found antifreeze sitting on top of the transmission below the reservoir? I just noticed it the other day and washed it off with some water. It reappears later on other drives but the smell isn't near as bad as it used to be. My hoses look good the leak keeps appearing. I was wondering if the thermostat could be making antifreeze back up into the reservoir. Is there another overflow hole in the reservoir?

2011 lacrosse 3.6 V6
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Last edited:

Rich B.

Active member
300
50
28
Minot, ME
Buick Ownership
2016 LaCrosse & 2013 Boss 302 Mustang
Had a question too, forgot to mention. Not sure if antifreeze has a specific smell or odor unless boiled or burned off type fumes? Know such as raw gas is a sure thing on smell, tranny fluid a burnt smell can be detected with trouble.
 

2007LucerneCXL

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Illinois
Buick Ownership
2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
Going by the description only you may want to check the lower overflow tube #9. It's in the location above the transmission may be loose or cracked do weather changes and is the simplest to start with.
1408254G01-034.png
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nlacomb

Buick Newbie
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Buick Ownership
Buick
Also check out part number 15 above. I had a small leak start there and eventually the clips gave out and I had a blowout of coolant everywhere.
 
43
10
8
Buick Ownership
2011 Buick Lacrosse
Had a question too, forgot to mention. Not sure if antifreeze has a specific smell or odor unless boiled or burned off type fumes? Know such as raw gas is a sure thing on smell, tranny fluid a burnt smell can be detected with trouble.
Burning smell. I can see a small puddle on top of one of the transmissions crevasses.
 
43
10
8
Buick Ownership
2011 Buick Lacrosse
Going by the description only you may want to check the lower overflow tube #9. It's in the location above the transmission may be loose or cracked do weather changes and is the simplest to start with.
View attachment 13163
Thanks i will take a look. And the weather changes daily in the dfw area
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2007LucerneCXL

Full Member
1,634
436
83
Illinois
Buick Ownership
2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
Not knowing your location it's more on the winter months of the north as the first couple of freezing temperatures can make leaks magically appear.
 
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