Question about 2000 Chevrolet Silverado
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
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
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
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
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
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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