So you can easily solve it by tightening these connectors. The more the coolant drips, the looser the connection is. You should see this liquid dripping from the valve and connector mounting locations. Normally, connectors connect valves with other parts of the cooling system and others of the vehicle.ĭriving for a long time on rough roads makes these valves loosen, entailing a leak of coolant fluid and an antifreeze smell in car vents. If the coolant drains quickly after you’ve repaired a previous leak, there may still be another leak inside that you haven’t discovered yet. You can easily notice the heater core leak through the fog on the windshield because a lot of steam will escape when it leaks.Īlthough it is relatively easy to spot, there could be more leaked spots than you think. It can also be spotted by leaving traces of leaks at the location where you park your vehicle. You can detect a valve leak when you see coolant dripping or spreading to neighboring parts in the hood compartment of the car. If the heater core or valve leaks, you will detect the antifreeze smell coming from vents when turning on the air conditioner. Heater core, valves, and cooling system work together to distribute coolant to the components of your car. ![]() If you can’t find the cause, you need to ask the mechanic for an inspection. The only way to check whether the reservoir is cracked is to look under the hood and inside the reservoir to check. Some leaky coolants don’t have any smell, so sometimes you’ll find that the coolant dries out too quickly but doesn’t detect anything out of the ordinary. If it leaks, the coolant level will drop and cause the engine to overheat, followed by serious damage. This reservoir stores an adequate coolant amount to keep the engine running efficiently. The antifreeze smell in vents also originates from cracked coolant reservoirs. The most likely explanation is that the coolant in your radiator dries out too quickly. If you don’t see any coolant dripping out, it may have leaked into other internal components due to a puncture. ![]() In addition, the leak is also triggered by a leaking radiator cap, damaged cylinders, damaged pump, and faulty auxiliary engine coolant. It shows that your car’s coolant has leaked from a pipe or another deep inside, dripping into a puddle underneath the vehicle.Ī cracked, punctured pipe or a torn radiator in the vehicle can lead to this fluid leak. The most noticeable one is a puddle of coolant underneath the car compartment. You can observe and spot a few obvious signs. The most common cause of the car smells like antifreeze when AC is on is the coolant leaking. Common causes of coolant smell from vents are coolant leaks from the reservoir, valve and heater core radiator and head gasket.īesides, loose connectors also trigger coolant leaks, leading to a sweet smell from the car vents.
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