1998 silverado heater fan no functioning then smoking
I was conducting tune up on vehicle. Started engine and turned on fan to warm interior of the vehicle. no fan. Left knob on level 5 and after a few minutes could smell and see electrical smoke. any hints.?
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the way any motor vehicles interior heater works is by allowing water from the engines cooling system to circulate through a mush smaller radiator located behind the dashboard and the fan blows air through the radiator allowing the warm water to heat the air so when you select warm or cold via the interior controls a valve fitted in line of the water pipes that is linking the engine bay radiator to the interior one allows water to flow which makes me believe that valve is not functioning
I beleive that you may have low coolant because as your vehicle warms up the coolant volume increases which would give you just enough coolant to circulate to the heater core. When you are stopped your water pump also isn't circulating as fast and sending that little bit of coolant to your heater core, I imagine that if you top up your radiator or resevoir with coolant your problem should disappear. Keep an eye on it to see if it goes down again as this might just be air coming out of the system or it might indicate a leak either external (drip) or internal (whitish smoke in warm weather). Hope this helps.
I just started experiencing the same problem. Yes, typically after rainy days, I can never get the interior lights to go out after the ignition key has been removed. The car acts as if there is a door open. Now, my latest problem is with the heater fan. Of course, putting the control in the "off" position will turn it off but you can turn it on and off with no ignition key installed. I'm also having problems with my heater core too so it's been a pain in the but!!
I believe this problem has also caused my battery to die which is why I'm on this site in the first place!! I can't get into the car with the keys and the dead battery won't allow me to unlock the car!! When it rains it pours!!!
The whole dashboard of the vehicle will need to be disassembled, removal of stereo, temp controls, air vents, the dashboard will need to actually be pulled away from the front of the cabin, It is a very labor intensive repair.
the fan is slow in chipping in allowing the engine to overheat damaging the already poor head gasket the car was built with.wire the fans to work as u turn the engine on after u change the thermostat and all hoses.