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My 2001chevy silverado is leaking antifreeze around the fire wall and when i turn my heat on in the truck it will get warm but there is a antifreeze oder. and when i shut it off there is a fog or smok

Is the problem the heater core or is there a problem with the connectors at the fire wall?

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  • Cars & Trucks Master
  • 2,101 Answers

You have a blown heater core very common

Posted on Oct 29, 2012

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

j_del
  • 1586 Answers

SOURCE: 2004 volkswagen passat v6 no heat

Do you notice that the engine coolant temperature gauge stays on the lower part of the scale as well? If so, it's likely that your thermostat is stuck open - this prevents the coolant from staying in the block long enough to absorb heat that is used to heat the climate-controlled air. I'm not positive on the 3.0 in your car, but the 2.8 V6 in my Audi A4 requires tremendous disassembly in order to change the thermostat. I believe the 3.0 is the same - the labor involved is only slightly less than that required to do a timing belt change (which, if you change the thermostat, since you're already all the way in there, you may as well do the t-belt service as well so you don't have to pay for all that labor again any sooner than necessary).

Posted on Sep 30, 2008

  • 98 Answers

SOURCE: 2000 Cherokee not warm

Aside from flushing the radiator and heater core andreplacing your hoses, did you happen to replace your thermostat. Sounds to me like that's your problem if everything else seems to be in order. If you change the thermostat and still have no heat, you might check your vacuum lines running to the back of your heater controls inside your dash. That's really the only other thing that I believe could be causing your lack of heat.

Hope this helps! Have a great day and try to stay warm!

Posted on Nov 23, 2008

dgjtex
  • 405 Answers

SOURCE: antifreeze smell and smoke coming out of vents

This is definitely a heater core issue, but I might also suggest one of the many over the counter cures first before replacing it, the heater core is not a very expensive part but quite a chore to replace.

Posted on Dec 28, 2008

  • 360 Answers

SOURCE: No Heat and Overheating in 1999 Chevy Silverado

After replacing the thermostat, you must bleed the air from the cooling system.

To bleed air from the 2.2L and 2.5L engines, remove the plug or sensor on the top of the thermostat housing. Fill the radiator with coolant until the coolant comes out the hole. Since the plug is made out of steel and the thermostat housing is aluminum, it is a good idea to apply an anti-seizing compound or Teflon® tape on the plug threads prior to installation. Install the plug and continue to fill the radiator. This will vent all trapped air from the engine.

Any trapped air in the heating system will have to be displaced by coolant. Once the cooling system is filled, with the radiator cap off, turn of the heater at it's highest setting. Start the engine and allow it to reach operating temp. You should see a drop in the coolant level as the air in the heating system is displaced by coolant. Add coolant to the proper level and replace the radiator cap.

Keep a close eye on the coolant level for at least the next couple of weeks. The cooling system is a "closed" system. Any significant decrease in coolant level indicates a problem.

If you have any questions, let me know.

Please take the time to rate this solution.

Drive safe and be warm.

clarkco

Posted on Feb 02, 2009

  • 106 Answers

SOURCE: Heater Core Leaking

you could quick fix! but you will have no heat, 1st under the hood, look at the back of motor, follow all you're radiator hoses, take two hoses off the heater core stick a pipe that is big enough then clamp the pipe down. to both sides of hoses to the pipe you will eventually have to replace heater core!!

Posted on Mar 24, 2009

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2 Answers

I have a 07 silverado with 39000 miles and i get a burnt fluid smell out of the heat vent after i drive it for a while and come to a stop nothing is leaking on the ground and runs fine


You might not see leaks if the fluid is leaking on the engine where it gets burnt off before dropping to the ground. That happened to me. Check all of the fluid levels. Engine oil, transmission oil, power steering oil and the antifreeze. Check when warm not hot, not cold. Pay special attention to the level and check once each day until you detect which is leaking.

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pretty vague question...do you have heat? meaning if you switch to defrost does it blow normal heat? If you have no heat anywhere could be as simple as adding antifreeze..if antifreeze level is correct run engine with heater on, locate two hoses that go from front passenger side of engine to firewall(they connect to your heater core). After engine has been warmed up feel the two heater core hoses if one is very warm and the other is not you may have a plugged heater core or an air bound heater core. If heater core is plugged disconnet hoses at engine and send compressed air through the cooler of the two lines to free up any blockage(I adjusted my air output on my compressor to 45psi). After i cleared blockage i sent CLR through it and rinsed it out both ways with a garden hose(i didnt want the clr going through the engine block). I then filled the heater core & lines with antifreeze premix, reinstalled the lines and topped off the resovoir and I had heat...If you do not have a blockage but are air bound I would buy a compression gas tester from your local napa or autzone and test your antifreeze to see if there is compression gas getting into your cooling system. This could be caused by a crack in a cylinder wall or a weak gasket common on the 5.3's and even more common on the 4.8's2_18_2013_2_17_14_pm.jpg

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