Question about 1996 Chevrolet Blazer

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My heater is not blowing a good flow of warm air. The fan is working, but the sound of the air blowing is muffled like there is something blocking it. I just replaced the fan speed switch, the resistor unit and the heater core. I have read that the air deflector is vacuum operated. I have noticed that my engine idle speed has gone up about 300 RPM Any indication of a vacuum leak? I don't hear any whistling.Maybe not related. Tired of throwing money at it..HELP!!!

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  • Master
  • 371 Answers

Try replacing the cabin pollen filter its usually under the dash passengers side

Posted on May 30, 2017

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Posted on Jan 02, 2017

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SOURCE: blowing cold air

I had the same problem that I just fix by flushing the heater core out with a hose.   take the two hoses off the fire wall and put the water to it and let flush.  my heater is putting out 150 dg. F  of hot air.   I'm so excited!  i will stay warm now.

Posted on Feb 27, 2009

emissionwiz
  • 76630 Answers

SOURCE: Low air flow from AC/Heater fan on '98 Chev K2500

check the cabin air filter behind the glove box, if it is ok or is not equipped (was optional) then the problem is a clogged ac evaporator core.

Posted on Jun 23, 2009

  • 135 Answers

SOURCE: Have a 1999 Silverado 4x4 Ext. cab. Power steering

If your steering is easier above idle the problem is the pump.

Posted on Aug 04, 2009

  • 4044 Answers

SOURCE: Heater in my 99 gmc 2500 is not working

They could be related but most likely not. There are two water lines which go back to the firewall from the radiator. On one of those lines is going to be a controller that is cable or vacum controlled. If it has a vacum line you need to check the vacum pressure at the connection using a vacum pump. You want to make sure that valve is opening and closing accordingly. If it isn't then your heater will not work because no water is getting to the core. In this case you will need to isolate the vacum leak back to the source of the problem. If there is a cable connections make sure the cable moves freely and in sync with the cab control. If not replace the cable. Assuming the radiator is full this valve is the next place to look for a fault.

Posted on Sep 23, 2009

  • 192 Answers

SOURCE: my 06 cobalt's heater does not blow warm air...

your problem is possibly a temp door actuator

Posted on Oct 30, 2009

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2 Answers

The heater stop working a couple days after i added a radiator cleaner and the heater stop blowing warm air today, is there a fues to replace or did the heater valve get clogged


If the fan wont blow air at all then it is a fuse. If the fan works and the car is warm you have a clog somewhere. you could try pulling a heater hose off when the car is cold to check for flow.

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Sounds like you are on the right track with the flow of hot coolant not stopping. Check your heater control valve to make sure it is stopping the flow of coolant through the rear heater core. Let me know. Hope this helps.

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No hot air is due to low coolant, or even poor coolant flow. The engine heats up the coolant, and it passed through your heater core, and the heater blower motor pushes air through the heater core to warm up the air. If your "fan"is working, but the air is cold, make sure your coolant level is good.

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The blower fan uses a voltage ballast block to control the different speeds. Sounds like it needs to be replaced. However, usually the highest speed still works, but not necessarily.
This is an inexpensive part and usually easy to change.
The voltage ballast issue. this is an electrical block which controls voltage to change fan speeds. Usually found under the passenger side dash, right in the air flow comming from the fan and inside the air flow housing. Usually held in by 2 or 3 screws with a connector and 3-4 wires sticking out. this should be under $20 to buy and quite easy to change, if you can find it. Try behind glove box etc. Do not test the new one without it being in place, as it may burn out very quickly without the air flow to cool it.
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1 Answer

The air is not cool when idling, it blows warm. Also the setting 1 and 2 doesnt work, only 3 and for makes air blow.


Sounds like 2 different problems here. The ac gets warm when standing idle, is most likely the under hood fan not kicking on when ac is on. This may be a fuse issue or a relay. When ac is on, the fan should be on all the time. Relay maybe in an electrical box under the hood. Unplug the fan and test for power with a test light to see if the fan has power when ac is "on".

The inside fan not working on levels 1& 2 is likely the voltage ballast issue. this is an electrical block which controls voltage to change fan speeds. Usually found under the passenger side dash, right in the air flow comming from the fan and inside the air flow housing. Usually held in by 2 or 3 screws with a connector and 3-4 wires sticking out. this should be under $20 to buy and quite easy to change, if you can find it. Try behind glove box etc. Do not test the new one without it being in place, as it may burn out very quickly without the air flow to cool it.
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Apr 30, 2011 | 2002 Chevrolet Cavalier Coupe

1 Answer

I've had my 2004 Nissan Sentra to several mechanics. It's still there. No one can figure out why I'm only getting cold air, no heat. (for weeks now). I paid for new thermostat, water hose, radiator. ...


Assuming they checked the controls under the dash and everything is working, lets try to bleed the air from the cooling system. An air lock in the heater core could stop it from getting warm. You will need a gallon of antifreeze and a jack to raise the car. Here we go: remove the radiator cap. Set the parking brake, transmission in park, block the rear wheels. Jack up the front of the car so that the radiator is higher than the engine. Start the engine and put the heater controls on the hottest setting but don not turn the heater on. With the engine running, look in the radiator, the coolant at this point should not be moving, or flowing through the radiator because the thermostat has not reached the temperature required for it to open. If the coolant is flowing at this time, then the thermostat is open and should be replaced. Let the engine warm up and watch the coolant level. When the thermostat opens up, the coolant level will drop, and you will be able to see the coolant flowing or moving in the radiator. Add enough antifreeze to fill the radiator ack up. The coolant level will probably drop again, Add more coolant as required. Repeat this process until the coolant level stabilizes and no longer drops while there is flow or movement of the coolant. Replace the radiator cap and lower the jack. Turn the heater on. If the problem was an air lock in the heater core, you should now have warm air blowing from the heater.. Something else to observe is the cooling fan for the radiator. If the electric cooling fan was running the whole time the engine was running, then the switch controlling the fan is bad. The fan should not come on until the radiator is hot. If it runs all the time, the coolant won't get hot enough for the heater to work. Let me know is this works.

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1 Answer

Engine warms up prperly but no heat comes into cab.


sounds like the heater matrix, can you here the fan working on the heaters?

Jan 13, 2010 | 1998 Saturn SL

1 Answer

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EITHER VALVE STUCK TO ALLOW WATER IN MATRIX OR YOU HAVE AIR BLOCK IN IT. TAKE OFF TOP HOSE AND RUN MOTOR, TOP UP RAD AT SAME TIME, USED A DESCALANT IF WATER MUDDY /RUSTY LOOKING

Feb 02, 2009 | 1997 Dodge Neon

1 Answer

2001 tahoe front heater not working, rear heater blows warm air


Notorious for plugged heater cores. Also updated plastic restriction couplers mounted at heater core available from dealer. Try back flushing heater core. Run engine till its at operating temperature then carefully hold the inlet and outlet hose breifly with heater fan on high if hoses are nearly the same temp then flow is good , if not then core is plugged.

Jan 18, 2009 | 2001 Chevrolet Tahoe

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