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My heater is not working in my alero what do i do?

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2001 olds alero. replaced thermostat last year. Heater still not blowing warm air just cold. AC works. Defrost blows cool air.


Heater core is bad. Part is about $40...labor is around $700. The entire dashboard has to be removed and this is a major time involved job. It takes 10 to 12 hours.

Aug 22, 2016 | 2001 Oldsmobile Alero

1 Answer

2003 oldsmobile alero a/c and heater fan quit working


Connect it directly to power to see if it works. If not, replace

Dec 07, 2013 | 2003 Oldsmobile Alero

1 Answer

2003 Alero, heater won't shut off? Fan shuts off but can't turn heater off.


Faulty heater control valve.Its located under the hood on the passenger side in front of the firewall.

Oct 29, 2012 | 2003 Oldsmobile Alero

2 Answers

Alero fuse 46 keeps blowing


I have seen this before were the 46 fuse keeps blowing and it is usually after somone has had the radio and heater control out. There should be 2 wire harnesses that plug into the back of the heater control but the 1 will fit the extra plug on the back of the radio and the customer had the heater harness pluged into the radio. Radio worked fine but the rear defogger and a few other heater controls did not and it would blow the 46 fuse as soon as the key is turned on,.

Dec 04, 2011 | 1999 Oldsmobile Alero

1 Answer

I have a 2001 Alero, rear defrost isn't working at all, frost inside my car, won't defrost and heat isn't working! :( HELP any idea's... I thought it was the heater core but there isn't any leakage un


You definatly have water inside the car. Pull the carpet back in the front and rear checking for water leaks. The only way frost can develope inside a vehicle is the presents of moisture.
The other possibility is your HVAC drain is plugged and water has built up inside the heater motor area. Have the drain checked and cleaned.

Nov 21, 2011 | 2001 Oldsmobile Alero

1 Answer

99 Alero 3400 engine heater will not heat, also the cooling fans auto headlihts rear defrost do not work what should I check


CHECK HEATER AND AC ALSO DEFOGGER ON A 10 AMP IGNITION FUSE. FOR AUTO HEADLIGHTS CHECK AUTO MATIC LAMP CONTROL RELAY CHECK DAYTIME RUNNING LAMPS RELAY.

Dec 19, 2010 | 1999 Oldsmobile Alero

1 Answer

Instuctions for removing heater core


  • Disconnect the negative cable from the Oldsmobile Alero's battery. While the car is securely raised on jack stands, drain the engine coolant into a clean container. Most models don't have a drain plug on the bottom of the radiator, so you must take off the lower radiator hose to drain the system.
  • Step 2 Remove the drain tube from the heater's housing and disconnect the heater hoses from the core. Take off the center console, if one is equipped. Then, take off the sound insulators on both sides of the car, the steering column's opening filler, the air outlet duct and the floor air outlet to reach the heater core.
  • Step 3 Disconnect the heater core cover. Remove the core-to-housing mounting clamps and remove the heater core.
  • Step 4 Install the replacement heater core. Connect the mounting clamps and replace the core cover.
  • Step 5 Replace the rear floor air outlet, air outlet duct, steering column opening filler, sound insulators and center console (if equipped). Reattach the heater hoses to the core and the drain tube to the housing.
  • Step 6 Fill the cooling system, using new coolant if the old liquid doesn't appear clean. Be sure the lower radiator hose is securely back in place before filling the radiator. Reconnect the negative battery cable.
  • Step 7 Start up the Oldsmobile Alero's engine and let it run until it reaches normal operating temperature. Observe the climate control operation and check for any leaks in the system.


  • Read more: How to Replace the Heater Core in an Oldsmobile Alero | eHow.com http://www.ehow.com/how_4590629_replace-heater-core-oldsmobile-alero.html#ixzz0uQeICxug

    Jul 22, 2010 | 2000 Oldsmobile Alero

    1 Answer

    2003 Alero, heater blower only works on the two highest position?


    The blower motor is located on the passenger side of the vehicle next to the blower motor. Run the fan on high and listen for the blower motor location if in question. The resistor will be mounted into the heater case and held in by two screws.
    Good Luck

    Mar 12, 2010 | 2003 Oldsmobile Alero

    1 Answer

    I have a 2000 Oldsmobile Alero and the heat wont work on any settings; why?


    It's possible the "heater control valve" is not working. Could be a cable or vacuume line. What ever controls it.
    Also the temp controls, behind the dash, ARE controled by vacuume. Could be a line is kinked or come off.
    Hopefully the heater core is not stopped up....

    Dec 03, 2009 | 1999 Oldsmobile Alero

    2 Answers

    Heater on a 2002 alero died


    check coolant.if check out okay .start engine let it get operating temp. then feel top hose if hot thermostat working .problem is in the dash the heater door not getting vacuum to open .could be stuck. or heater control unit could be bad

    Mar 05, 2009 | 1999 Oldsmobile Alero

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