I am leaking antifreeze under my blazer onto the ground but not inside the vehicle. My blazer does not overheat, my heat will work sometimes while driving but as soon as I stop or slow down it blows cold. If I add antifreeze the heat will work until it all drips out. What could be wrong with it? I need 2 get fixed ASAP because of cold kids. Thank you

If you smell steam/water/antifreeze inside the vehicle, then most likely you have a heater core issue. If it is more 'overheating' smell outside of the vehicle, it could be overflow container leaking on hot parts, leaking hose, radiator leak, etc.

Hi

i do not know if you have allready done this, but check the carpet under the dash press hard on it and see if it is wet, sometimes the small radiator in the heater ( called the matrix ) leaks due to corrosion, and you cannot see a leak from the outside as it is leaking inside the vehicle, also sometimes you will smell a sweet smell inside the vehicle if there is allot of antifreeze inside but not all the time.

Hope this helps.

check the thermostat

When antifreeze finds it's way onto the floorboard of the vehicle, it's more than likely a leaky heater core is the culprit. The heater core is like a small radiator located under the dahsboard mounted inside a plastic housing. The hot antifreeze running through it creates the heat that is delivered to you whenever you turn on your cars heater. When the heater core develops a leak, the lost antifreeze seeps through the seams of the heater core housing and onto the floorboard of the vehicle. You have 2 options: You can have the core replaced by a professional, (cost approximately $250-$350), or you can by-pass the heater core by removing the 2 rubber hoses that connect to it and splicing them together. Both procedures will stop the leak, but by-pasing will leave you with no heat at all. By-passing is much less expensive than replacing. So if money is more of deciding factor than having heat, then bypass!

Hello, if your car has a blown head gasket and exhaust is entering the coolant system, it will continue to run hot until it is repaired. Using pure antifreeze will make it worse. It should be at least 1/2 water. If the coolant reservoir didn't leak you could probably drive a few more miles, but not many, before it overheats again. All that is doing is giving you a little more capacity. If you continue to run the engine hot you are going to do more serious damage to it.
I suggest you have the head gasket replaced. That stuff you put in there seldom works, and if it does work, it's only temporary.

I hope this helps.

The heater core is leaking into the heaterbox under the dash. Which is why you smell antifreeze/coolant inside. After a while (if left go too long) you'll notice antifreeze on the floor/carpet and possibly running out from under the vehicle as it flows out of the drain for the air conditioner (the heaterbox has a drain in it to let out the moisture produced by the a/c)

Check antifreeze level to make sure it is up to correct level. If that is where it should be, replace the thermostat that is most likely stuck open. Check for antifreeze leaks under the vehicle under the water pump that could indicate your water pump is going bad. I would think it would be one of the first two though and they are cheap fixes.

good luck

If it's your heater core, unless you're a mechanic you probably should get professional help. The heater core is located on the firewall and many parts need to be replaced to get to it. Do you see water on the floor inside the vehicle, Many times a heater core will leak inside.

Do you smell a sweet odor when inside or outside of the vehicle when the engine is running?
Do you see any green fluid on the ground where the car has been sitting?
Is there excessive white smoke coming out of the tail pipe when engine is cold and hot?
These are three first things a mechanic will at to do a proper diagnosis, but these you can do yourself. It is important to not let your engine overheat as this could cause serious engine damage. Keep us informed on what you find to the above questions. This way we can guide you further on fixing your problem correctly.

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.