Question about 2000 Mitsubishi Eclipse

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Heater Problums with the smell of burning Antifreeze.EXTRA Detail

I have a 2000 Mitsubishi Eclipse GT V6. NOTE:Middle of winter. My car takes along time to heat up and once it does my temp gauge reads 1/2 hot. We only get hot air while driving. I kno so far this kinda seems lik a normal car but I can asure u its not, I have owned many cars and I expect it to take awhile to heat up in winter I allso kno that the car is going to put out more hot air while driving but this is unlike i have ever seen. Were talking cool air at most while the temp and fan setings are all the way.while parked. Then as u drive it seems as though the hot air fades in and out sometimes going back to cold air! THEN to top it off we allways smell the hint of burning antifreeze sometimes way stronger than others. I have checked the over flow tank and it seems fine, no one can find any anifreeze leaks and i had a auto repair man look at it and he said he didnt kno. He looked to make sure the head wasnt blown or that there wasnt antifreeze leaking on the exaust or in the oil. AND THERES MORE sometimes when I start the car it hear this hissing rumble noise (only sometimes) the rpms drop and the car allmost stalls out and u smell lots of antifreeze almost asthough the car over heated on a hot summer day,yet I check and everything seems ok after it stops. It ushally happens after i hae driven the car for a bit then let it sit for say 2 hrs and try to start it again. ANY help would be great! Should I be alarmed that the temp reads 1/2 in winter? Or is this normal for this car? They all seemed to be linked so I put them all together. PLEASE HELP! Another NOTE i once had a car that was really low on antifreeze and did alot of the same things, such as the smell,noise,heat in and out ext but that was cuz there was all most no antifreeze in the car. I hav checked the antifreeze level 100 times and its full hot or cold. and the over flow tank looks fine as well.

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I really feel you could be losing a small amount of coolant from the heater matrix/core.

It appears we have an Air lock scenario due to this and you will need to perform a system Bleed.
Park the vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater on full and blower to max. When engine reaches operating temperature watch and listen near coolant filler, keep clear as gurgling and hopefully a boil over should occur. Top up with very warm coolant and wait as it may do it again.
Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.
Also with your temp gauge reading 1/2 this is normal, possibly the core is blocked or as already suggested leaking, a Radiator sealing additive might help BUT it may be the cause of your cold/warm air?
TOO MUCH SEALER blocking the Matrix/Core?
I hope all this helps!

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Posted on Feb 18, 2009

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Take the hoses off the heater core and flush the core out with a garden hose couple minutes each direction, I just went through the exact same thing with my blazer you can bet you will have to flush it every once and a while until the heater core filters out all the loose sediment in the cooling system as the core passeges are very very small it acts like a filtre

Posted on Mar 01, 2009

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I had similar problems with mine albieit at different times. The heater could be the heater core. Mine did the same thing before it split open. The random stalling was a loose wire grounding out on one of the pullies. I hope this helps

Posted on Mar 06, 2009

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Posted on Jan 02, 2017

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