I have a 98 S-10. The blower blows air but nowwarm air. I changed thermostat and I noticed when flushing the radiator that after we put more antifreeze in it and ran it the top radiator hose wasnt hot but the bottom was. Could the reason for this heat not working be the water pump not circulating?
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Re: Why isnt heat working?
Yes that is very possible but if your truck did not overheat before this it is doubtful. make sure you did not put the thermostat in backwards. if you flushed out the system did you force any air through it to blow out old antifreeze? if you did, this may have broke some stuff loose in your heater core and plugged it up . it could also be air locked, if the system was completely empty and you refilled it . turn your radiator cap half open (not all the way open ) so it is still locked on but not tight and run your vehicle for a while to burp the air out of the system . add antifreeze if needed after this .
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1 check,Feel the heater hoses,do they get hot ,both or one?They should be hot,if not flush the heater core directly with a hose,back and forth at each hose connection.
2nd check,clamp off the top rad hose and force the hot water through the heater and check heat output.If there is heat with top rad hose clamped change the thermostat,it's either leaking or defective,new or not.
There are two possibilities, one is the thermostat. Many people remove them which spoils the whole heating / cooling system. Since you changed the thermostat, I would check the heater valve on the heater which allows the hot water to circulate through the heating system.
It may be necessary to remove the heater box and flush the heater core since you talk about a lot of rust, which could have clogged the heater core and / or the pipes leading to the heater.
If you flushed the coolant with the thermostat in, chances are you didn't flush the coolant. Regardless, it's easiest to check the controls inside first. Does the blower fan work? Does the air flow change from floor to vent, to dash as it's supposed to? Does the A/C change temps when knob is turned from cold to hot? Post results.
Did you bleed your system of air???....usually a bleed screw near the thermostat housing...get allllll the air out...simetimes the heater core is at the highest oart if the system..therefore if there is air in system..thats where the air settles and no coolant will flow through the heater cire!!
The thermostat could be stuck open or the heater core or radiator could be clogged or it could be a faulty heater control valve.I would flush the coolant sytem out with prestone super flush and put a new thermostat in it first.
CHECK SEE IF HEATER BLOWER MOTOR WORKING, REMOVE HEATER BLOWER MOTOR HOT WIRE HEATER BLOWER MOTOR SEE IF BLOWER MOTOR WORKING BLOWER MOTOR FAULTY OR YOU HAVE FAULTY WIRING AT BLOWER MOTOR AND RESISTOR.
it sounds like you have a air blockage, or the cooling system needs flushed. to flush system go to ( autorepair.about.com/od/regularmaintenance/ss/coolant_f...) click on 3rd one down. remember to bleed air out of system, this works the best. turn heater and blower on high, start adding coolant. start car let it idle till radiator thermostat opens. when top radiator hose gets hot you should have heat. some vehicles have a bleeder to let air from system. when filling putting coolant in system. if it does, then open bleeder while engine running and putting in coolant untill there are no air bubbles coming out. have a good day !! when doing flush if need be. you can go to any auto parts store and buy radiator flush. follow directions on the back ( prestone is best )
if you have changed the thermostat. did you bleed air out of system, if air is trapped in system it will not heat right! drain radiator and flush it good, but when refilling turn heater on high heat. then bleed air out when refilling system. most all cars have a bleeder for air. if in doubt, call any auto parts store to find out where yours is. if air is in system you will see bubbles appear from bleeder. also when flushing engine, make sure you start vehicle so it circulates through engine as well as refilling system. if the upper radiator hose gets hot then check for heat from car if it is ok! close bleeder and make sure radiator is full. I think the biggest culprit is air trapped in system. before starting the flush, be sure its not caused by low coolant in radiator. have a good day!!
Sounds exactly like what my mom's car was doing as for the blower only working on high. It was the resistor... I assumed it was the climate controls and replaced them but it didn't change anything then i thought that i must be the blower motor and replaced that too but it turned out to be the resistor which is under the dash on the passenger side of the car.