Question about Mitsubishi Diamante

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Odor coming from heat only the heat heater core has been fixed

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You most likely have residual coolant coating the inside of the heater AC ducts, give it time it should vaporize and go away, also are you sure the leak has been fixed, it is easy to damage a heater core when installing new one, they are very fragile.

Posted on Aug 04, 2008

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Burning plastic smell when cold out run heater and fan inside car and out


Are you loosing radiator fluid. sometimes the heater core will rupture and you will smell burn odor. also check for strange rubbing sounds or screeching coming from the blower fan motor. or engine exhaust manifolds are hot when car is on, make sure nothing is leaning on them which will cause a burn odor. Any odor coming from outside will find it's way inside through the fresh air vents.

Feb 13, 2016 | Cars & Trucks

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My heat and defrost isn't working on my chrysler 300m what do I need to do to fix it


There is a valve that is vacuum opperated that allows hot coolant to flow into the heater core inside the car. The valve is mounted inline w water hoses leading to heater core. Has a vacuum line running to it. Make sure it works. Turn heater on. Remove vacuum line see if valve accuates. Movement it works. No movment either valve is bad or no vacuum at valve. Check and make sure there are actually coolant lines leading to heater core. Somtimes when a heater core goes bad and starts leaking (you will smell coolant odor in vehicle) a quick fix is to remove the lines and link them back to each other under the hood. No heat no defrost. Make sure this isn't the case w your car.

Dec 06, 2015 | Chrysler Cars & Trucks

1 Answer

Heater smells when on


Unsure as to why no evidence and should have had some. New one could be defective or broken while installed. It's really the only item to make the odor in interior.

Are you consuming antifreeze? Pressure test system for leaks, If you paid for this job it's theirs to take care of!

Antifreeze liquid will very slowly evaporate and the heater box if with A/C should have a drain so no volume of antifreeze should be held there but some could.

Odor should go away in time. If heating run it hot and open windows if needed should speed it up. Products like Lysol down where incoming air comes in from near where wipers attach could help.

Hey - know that engine antifreeze is a poison so if any sign of an ill effect get this fixed, u cant allways find a coolant leak by looking at it. it only takes a tiny pinhole leak to squirt it out when the system is warm and under pressure. the core would need to be pressure tested to know for sure if its leaking. one weak spot on lots of heater cores is where the tubes come in thru the firewall and attach to the core body. sometimes that joint can get a tiny stress crack and start leaking.

as for why the smell is worse now, it could be that when he took the old core out, coolant from inside it spilled out of the core into the core case. or its even possible that the new core is defective, again most likely where the tubes join the core body. either way, a puddle of coolant in the case can cause the film on the windshield in defrost mode.

Jan 01, 2012 | Chevrolet Blazer Cars & Trucks

1 Answer

My front defroster is not working at its best, however the back one is working properly. If I add any heat while trying to defrost my windows the problem get worst.


Sounds like the heater core is leaking coolant. If it is leaking it will blow steam out of defrost vents and fog the windshield. Symptoms: low coolant level in radiator, steam coming out vents when engine is warmed up, odor of anti-freeze coming out of vents, wet carpet in floorboard near heater blower motor.
If so, replace heater core.

Dec 07, 2010 | Ford Taurus Cars & Trucks

2 Answers

When i turn on the heat i get a mist and a antifreeze odor


your heater core is bad, replace it and your problem will be fixed.

Dec 01, 2010 | BMW 750 Cars & Trucks

5 Answers

Heater immediately fogs all windows and there is a sweet odor in the cab of 2003 Buick Rendezvous, defroster works fine, but will not clear the windows after heat is put on


Sounds like a possible heater core failure(hole in it) the smell indicates to me the coolant(anti-freeze) is leaking into the passenger compartment.
Check the carpet in front of the front passenger seat for moisture, this would confirm heater core leak.
Good luck !

Jan 28, 2010 | 2003 Buick Rendezvous

2 Answers

Bad odor (Wire sheathing?) from vents when fan is on. We definitely have an intermittant (3 or 4 times in past year) driver side actuator problem. Cannot tell if odor is coming from all vents or not....


the heater core is bad it could be leaking and thats what the smell is coming from. you only smell it when the heat is on is because air flows throught the heater core to warm it by the hot anti freeze that flows through the heater core see if you anti freeze resivoir is low.

Dec 28, 2009 | 2004 GMC Sierra 1500 Crew Cab

1 Answer

Heater core or blower motor?


Sounds like your blower motor , you heater core is a non mechanical part and if it were the issue you are correct in thinking you would see fluid on the floor or mist on the windshield.

Dec 17, 2008 | 2005 GMC Envoy

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