Question about 2000 Chevrolet Silverado

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I have a 2000 4.3L silverado. Heater & AC works but when defrosters are turned, on my windows fog. Why???

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  • Chevrolet Master
  • 6,674 Answers

Check coolant level, if it's losing coolant, you may have a heater core leak. Does it smell like antifreeze in vehicle when defroster on? If by chance your ducting drain is plugged, it may just be water or condensation build up inside where core is. Antifreeze leak will also put a sticky film on inside of windshield, so if you wipe it with finger and it feels sticky, it may be a core leak. Be sure to double check heater hose connections in to firewall/heater core, just to be sure your leak isn't a bad hose connection before going to far if core appears to be leaking. A pressure test on system may give you a better idea what's going on. If all checks out and no leak apparent, be sure your AC compressor is engaging when in defrost mode, as that is what helps remove the moisture in the air during defrost. If compressor is not engaging, it will take much longer to remove moisture in the cabin.

Posted on Feb 18, 2012

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  • Chevrolet Master
  • 2,007 Answers

I'm not that familiar with the heat controls on said vehicle, but if there is a way to change the air intake from "recirculate" to "fresh", do that. Most of them do that automatically. Make sure the vents are clear of snow , ice and debree on the outside of your truck at the bottom of your windshield, just under the hood. Check that all your hose connections are tight and in good condition under the hood. If there is one that is steaming a little bit, it will **** that steam into your truck and fog the windows. If you can smell a hint of antifreeze in the cab when you are driving, you have a cracked heater core or a loose connection.

Posted on Feb 18, 2012

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Posted on Jan 02, 2017

  • 59 Answers

SOURCE: The heater door that directs the airflow is stuck

there is a plug/electrical that is almost directly below the dash on the hump of the floor board. right hand side of it. below carpet though. move connection there and see if it affects it. there is a wiring issue on I know 03 and on where harness that connects to blower motor melts. also has a "resistor" that goes bad. you can buy both from gm dealer.

Posted on Dec 10, 2008

  • 96 Answers

SOURCE: 2000 S10 Heater/Air

you have a bad heater core

Posted on Feb 03, 2009

  • 61 Answers

SOURCE: MY heater fan works on 4 & 5 Only on my 2000 Silverado

remove the passenger side lower insulator panel. behind the panel you wil find the blower motor housing. next to the blower motor housing there will be a wiring connector with 6 to 8 wires going in to it. the connector will be held secure with 2 screws. remove the connector and remove the screws -- this is your resistor. reverse the process to re-install.

Posted on Jul 24, 2009

  • 1 Answer

SOURCE: 2000 Chevy Silverado 1500 The heater does not

Had the same thing happen to my truck, the blen door actuator is under the console on passenger side, but the heater core is going to be clogged if you dont have any heat coming through, but a/c works..

Posted on Oct 06, 2009

motor1258
  • 6674 Answers

SOURCE: 2000 silverado w/100,000mls. Heater will not get

Raise the hood, get the truck up to normal running temperature, with heater on, and see if you can feel the temperature of the hoses going in to firewall that attach to heater core. Careful, they may be hot, or at least one should be, but both should feel pretty close to same temperature. If one is quite a bit cooler than the other, then I suspect no or little flow getting through that heater core. Have a look for possibility of a flow control valve in one of the heater hose lines as well that may be malfunctioning. Another thing would be to listen under dash for movement of doors while switching temperature setting from hot to cold and back and forth.

Posted on Dec 22, 2009

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Assuming that it is working in frigid conditions, sometimes The
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When I turn my heater and defroster on, a bad smell starts and the windows fog up but the air is hot.


This may be due to a bad heater core or dirty core with a plugged water drain, first see if the a/c works. turn it on and see if the air gets cold and if the ac compressor works.

The way the defrost works to keep windows from fogging up is that when the front defroster is tuned on the ac should also be on, on most cars when you go to defrost it will turn ac on automatic. the system then uses hot and cold air to remove the moisture in the air to avoid window fogging. if your a/c is not working then that may cause window to fog, but if you are also getting a smell then the drain that lets out condensation may be plugged and then water builds up and also mold from always being wet and when heat is on you smell that.


i want you to run the defrost and when windows fog up wipe window with hand and see if it is greasy . if it feels oily then you may have a bad heater core, the core leaks coolant out and steam and causing windows to fog up with a flim of grease.

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That was a very good question, and one that I receive quite often.
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