Question about 2001 Chevrolet Blazer

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When I turn my heater on there's a sweet smell.

When I turn my heater on after the blazer sitting a while it has a sweet syrup smell. I thought it was the heater core but my floor board wasn't wet from antifreeze and I check my radiator and its at the same level. I have a small leak from the water pump though.

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  • 29 Answers

Hi, fix the water pump leak,the smell could be coming from he antifreeze burning off the hot engine .

Posted on Dec 09, 2014

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Posted on Jan 02, 2017

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DickCanFixIt
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SOURCE: antifreeze smell and smoke coming out of vents

You have a coolant leak most likely in the heater core. Try disconnecting your heater hoses and coupling them together, then running the engine to see if the leak goes away. If it does, I would have the heater core replaced.

Posted on Dec 28, 2008

  • 106 Answers

SOURCE: Heater Core Leaking

you could quick fix! but you will have no heat, 1st under the hood, look at the back of motor, follow all you're radiator hoses, take two hoses off the heater core stick a pipe that is big enough then clamp the pipe down. to both sides of hoses to the pipe you will eventually have to replace heater core!!

Posted on Mar 24, 2009

  • 25 Answers

SOURCE: strong antifreeze smell when running the heater in

Usually a smell of antifreeze in the cab when the heater is running is a sign the heater core is leaking. Just becasue you dont see a leak at this time doesn't mean there isn't one. It might small enough that the haet from the core is burning off the leaking antifreeze. I would suggest replacing the core before you get in one day and there is a puddle on your floorboard. Or if you go to a local parts store and rent a cooling system pressure tester, wait until the vehicle is cold, pressure the system to 12 lbs and then check for leaks. Hope this helps you out......

Posted on Oct 22, 2009

Testimonial: "that is what i also thought, no puddle yet, just waiting. I tried a sealant for now, but will get a heater core"

  • 1 Answer

SOURCE: I have a 1995 4X4 S10 blazer and the problem I am

1997 Chevy Blazer... my heater puts out small amount of heat, and its a cool heat, not hot like it should be. Also when fan is running on the heat side, its not as full forced air as when I switch it to the cool side. Can't tell if its the blower, something is stopping the air from flowing all the way, but then again, what air is coming through, should be hotter than what it is.??

Posted on Jan 01, 2010

  • 192 Answers

SOURCE: 2000 Chevy cavalier first my car

The heater core is not plugged, it is leaking and will have to be replaced. It will have to be accessed from under the dash on the passenger side. This can be a very difficult item to replace and very time consuming. Plan on it taking a full day.

Posted on Jan 29, 2011

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1 Answer

I have no heat and antifreeze smell is coming into the van its a 2000 ford winstar


Is your floor wet damp carpet? Does the smell kinda smell sweet or like maple syrup? If so your heater core is leaking. Your heater core is up under ur dash inside the van onthe firewall

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The sweet smell you are getting is probably radiator coolant (antifreeze). This, if coming from the heater vents, most likely means that you have some sort of leak in the heater core. Either it is a loose clamp or possibly a defective heater core. Watch the coolant level carefully to avoid excessive loss and potential overheating. Be advised that simply not using the heater will not strop the leakage, as the coolant is always running through the core. It will only cause you to not get the smell since the air is bypassing the heater core.

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Does it smell like syrup? If so, you are smelling your coolant.

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White smoke sweet smell. Sounds like Antifreeze evaporating..check your radiator and hoses, as well as your heater core. It is hard to fully answer a question without a hands on inspection, kind of like me asking you over the phone if you like my new tie I am wearing..

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1997 blazer,heater bad smell when on


Is it a bad smell or a sweet like maple syrup smell. If its sweet you got a coolant leak probably heater core. Bad smell possible causes burning something up. I would run some water in the in the air intake below your wipers just to see if it changes. Not much but a little. Better or worse in cold tempers. Hwo about when the car first start or has run awhile does the smell get better or worse. More feed back please.

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Water in floor board and I think the drain back hose is stopped up. Thought the windshield was leaking but the insulation was wet right under were the heater hoses go threw the firewall. I poured water on...


While what you are describing certainly could happen, it seems unlikely you'd have water coming from a blocked a/c condensate drain at this time of the year. The a/c will produce condensation when cooling the flowing air to give a comfortable summer time ride. This condensation is drained to the outside (underneath) of the car by the hose you are describing. Unless you live in a particularly hot climate, I don't think this is your problem given the time of the year

I'm thinking it's a better likelihood you've got a leaking heater core. If your turn the defroster on, do you get a whiff of something that smells sweet? (Kinda like pancake syrup). A leaking heater core can funnel this kind of odor up thru the defroster ducts and into your face.

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I have a 1999 chevy blazer with smoke coming out the vents when the defroster is on. What's the fix?


often that smoke is actually misty antifreeze from a leaking heater core. wipe a little of it up and sniff. sickly sweet smell it is heater core time.

Dec 13, 2010 | 2001 Chevrolet Blazer

2 Answers

Floor and carpet wet


absolutely can be the windshield. With an assistant sitting inside the car to examine the windshield edges as you slowly apply a slow soft stream of water on trhe windshield, going slowly starting at the top. If in the end , no leak is found, examine inner firewall going up under dash for water drippage. No guarrantee the leak is the windshield. Could be a side door or window leaking. Imagine if your carpet was soaked with engine coolant. Could be the heater core leaking into the inside of the car.

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Car Heater smells strange


from he Popular Mechanics site if the smell in your car is like maple syrup:


(1) SMELLS LIKE: MAPLE SYRUP
WHEN: After the engine has warmed or possibly even after it's shut off for a few minutes.
THE CULPRIT: Coolant containing sweet-smelling (but toxic) ethylene glycol is leaking from somewhere. It could be coming from a radiator or heater hose, a failed intake manifold gasket or cylinder head. It might be coming from a leaky radiator cap or the radiator itself, especially if you smell it outside the car. A strong odor inside the passenger compartment probably means a bad heater core.

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