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Smell the coolant in the air vents after two or three minutes after engine is started

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Heater core has a leek in it , replace it or bypass it

Posted on Aug 26, 2010

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Posted on Jan 02, 2017

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Have a ford five hundred 2005 changed the thermostat and have air in the system how do i get it out ?


NOTE: The addition of Cooling System Stop Leak Pellets, darkens Motorcraft Premium Gold Engine Coolant from yellow to golden tan.
  1. Fill the degas bottle with the correct engine coolant mixture to the degas bottle seam line.
  1. Install the pressure relief cap.
  1. Remove the retaining clip and the fill tab on the top of the thermostat housing and fill through the thermostat housing until full.
  1. Install the fill tab and retaining clip.
  1. Select the maximum heater temperature and blower motor speed settings. Position the control to discharge air from the A/C vents in the instrument panel.
  1. Start the engine and allow it to idle until engine reaches normal operating temperature. While the engine is idling, feel for hot air from the A/C vents.
  1. CAUTION: If the air discharge remains cool and the engine coolant temperature gauge does not move or the low coolant light comes on, the engine coolant level is low in the engine and must be filled. Stop the engine, allow it to cool and fill the cooling system.Run the engine at 3,000 rpm for 10 minutes. Hot air should discharge from the A/C vents. The engine coolant temperature gauge should maintain a stabilized reading in the middle of the normal range, and the upper radiator hose should feel hot to the touch.
    • Shut the engine off and allow it to cool.
    • Check the engine for coolant leaks.
    • Check the engine coolant level in the degas bottle and fill to the seam line.

May 15, 2018 | Ford Cars & Trucks

2 Answers

2004 subaru outback, heating system acting up


Thermostat Stuck on warm up & or you have
a possible head gasket failure & I would suspect
a loss of coolant.

If that is the case, you have a ruined exhaust converter &
O2 sensors as well & a $5,000 plus repair bill coming

Mar 05, 2014 | 2004 Subaru Outback 2.5

1 Answer

After hot engine wont start and smells like gas


Most likely causes are bad engine coolant temp sensor OR leaking fuel injectors. Bad engine coolant temp sensor will give computer false reading and computer provides wrong air fuel mixture. Leaking fuel injectors will load the engine with raw gas--just like flooding it. Try pushing the gas pedal to the floor and holding it there when cranking when hot. That forces the computer into "clear flood" mode and it shuts off the injectors. If it starts up with pedal down, that would be a sign of leaking injectors.

Jul 21, 2017 | 1999 Dodge Intrepid

1 Answer

Why does white smoke comes out the air condition vent of a Ford Explorer


The most common reason is leaking coolant, either in the engine compartment or in the heater box.

Apr 14, 2013 | Cars & Trucks

1 Answer

No heat just cold air


Is the gauge showing the engine is warming up to normal temp ?
Are the heater hoses getting hot ?
If the heater core is getting hot, it could be a blend door problem. The blend doors direct air thru the heater core and the ac evaporator among other things.

Dec 06, 2012 | 2005 GMC Yukon

1 Answer

I see a misty smell like anti freeze coming through the vents in the car


Holy cow you can see smells?????


haha just messing. If you have the smell of anti freeze coming through the vents it means that the heater core needs to be replaced. The heater core cycles the hot engine coolant and uses that to warm the air to give you hot air. If you can smell it it is leaking into the vent system and needs to be replaced.

Apr 22, 2011 | Buick LeSabre Cars & Trucks

1 Answer

My lincoln is shot smoke out of the vents when I turned the defroster on and there is a strange smell comming from the vents as well. Also, the front window will not defrost but i can get cold and hot air....


The smell you are probably smelling is leaking coolant coming from your heater core, check your coolant level and see if its low if its low you are probbaly loosing your coolant because of a bad heater core, if this is the case i wouldnt drive the vehical until its repaired, if you run the car out of coolant you run the risk of engine damage from overheating and that would be a very expensive repair.....

Dec 07, 2010 | 1996 Lincoln Town Car

1 Answer

Cabin smells when heat or defroster is on


What your smelling is most likely coolant (antifreeze). You may have a heater core leak. If you dont smell the same smell after running the A/C or just vented cool air from outside for a few minutes then that is your problem.

Nov 12, 2009 | 1998 Dodge Caravan

2 Answers

Little plume of white smoke coming from engine when idling only. Runs great and not overheating. Really bad smell coming through vents with AC on


A little white smoke is OK from 0-15 minutes of start up.

After warm up the condensation inside the exhaust pipe AND under the hood should be purged.

How many mile is on the engine?

A well care for engine should not have to worry about leaky (pin hole leak) head gasket until 120,000 miles.

The other sources of coolant leak is the freeze plugs.

DO NOT WAIT! Take 15-20 minutes out of your schedule and see where is it leaking on the idle.

it can be at


heater hoses
water pump
freeze plugs
and head gasket


I would start monitoring the coolant consumption by making the coolant reservoir tank.

Keep tab on oil level.

====

The common A/C air vent odor are

coolant leak (even pin hole leak) on the heater core.

KEEP CHECKING the center to passenger floor carpet for wetness and smell of coolant.

and/or

mold in side the air tube vent.
there is cleaner spray you can buy to keep the mold.


Aug 07, 2009 | 2000 Hyundai Sonata

1 Answer

Engine running hot displays on dash....cold air blowing thru vent


there,s a chance that your hot-cold air trap is not working

Feb 22, 2009 | 1995 Cadillac DeVille

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