Question about 2000 Chevrolet Silverado 1500

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A/C & Heater fan switch only works on 4 & 5 and no heat in cabin.

Fan does not work on 1, 2 or 3, only work's on 4&5 and no heat blowing, only cold. Replaced thermostat and coolant however did not back flush the system. One heater hose hot, one not so hot, replaced bad heater control resistor however when plugging in new one, fan comes on high w/o key even in ignition or the a/c-heater control plugged in.

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It could be 2 seperate issues. The wiring harness under the dash has a long history of overheating and can result in any of the fan speeds to not work or work. Luckily this happened to my 2006 4.8L while still under warranty and they replaced the resitor harness(I can still see the plastic damaged on the plug. The heat issue usually is from low coolant, the hose assembly (in my opinion) is substandard. It is actually a "Y" hose assembly and where the 3 hoses come together, GM decided to make the "Y" out of plastic? It will leak and break within the first 5 years and cost $136+/- from dealer. If you are handy with copper, I used a 3/4in "T", along with 3/4 to 1" reducer fitting for the resivoir side and 3\4 inch hard copper tubing (about an inch or so long) on either end of the straight thru part of the copper "T". And literally cut the plastic "Y" out of the hose assembly. And used pipe screw clamps. All of the copper is availible at most home improvement stores, whowever I used HVAC braising sticks instead of regular plumbing solder to make the copper connections though I'm sure standard plumbing solder will work fine since its only 15 p.s.i.. then there is the issue of the wonderfull "quick disconnects" that will leak at the firewall going into the cabin as soon as you touch the pipe assembly. Goto auto parts store, disconnect them and cut off. Carefull now, the aluminum tubes that the "quick disconnect" fittings attached to can crush easily so when you tighten the hose clamps (yeah, did I mention to get 2 more and use them once you cut the quick disconnect off?), be carefull to not go crazy. It's improbable that you would crush the tubes, but just know that they are thin walled so use care.

Posted on Jan 26, 2013

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Posted on Jan 02, 2017

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SOURCE: 1991 camaro overheating

There are two freeze out plugs at the rear of the block (V8) and many v6 engines. If coolant is coming from where you say, likely they have failed. Unfortunately, the only way to reach them is to remove engine or transmission, It's rare that they fail because they are "protected " by the bellhousing, but can still rot from the inside out. There is no sealer known to man that will fix this. It's a shame that you need to do all that work for a pair of $2.00 plugs, but that's what needs to happen.

Posted on May 23, 2009

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SOURCE: 2004 silverado for some reason the heater/ac

Well had the same issue on my duel climate controll 04 2500HD but changing the heater control solved the different temp.The only other thing would be your mixer door motor.There are two,one for DR side is probibly stuck..As far as the blower motor.The resister should have taken care of that.Sounds like you may have another bad one.May want to take a volt meter to the resister plug in and run you different fan speed just to make sure that you get voltage to the different conecters.

Posted on Jan 18, 2010

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