Question about 1999 Chevrolet Blazer

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I put a new heater core in my blazer and now the heater is blowing cold air why?

Why is my heater blowing cold air after installing a new heater core?

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You need to verify that warm coolant is getting to the heater core by touching the hoses going into the firewall. If they are both the same temp or close, you might have a blend door actuator broken or sticking that does not direct warm air into cabin area

Posted on Feb 11, 2012

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Posted on Jan 02, 2017

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SOURCE: my 1999 chevy blazer will not blow heat

ther are two small tubes that open and close the valve to let in the hot air' one is from right under the carb intake and goes to the right (looking at the engine) right behind the fuse box. if there's o hole in that tube the heat will not work. just change mine becase the tube dry-rotted

Posted on Dec 04, 2011

  • 5 Answers

SOURCE: 1996 chevy s10 heater not blowing hot air

heater core or leak on cooling system

Posted on Jan 06, 2009

  • 3 Answers

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

  • 2418 Answers

SOURCE: on my 1995 chevy blazer s-10 my face vents are not blowing air

Your heater valve is stuck open, also in a pinch you can crimp off your hose to the heater coil at fire wall. Try to find the heater valve vacumb hose under the hood see if it is bad and fixit. or some models have a cable to the valve could be broken. 

Posted on Jul 28, 2009

morse008
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SOURCE: 1996 chevy blazer my air on heater will not blow

the idea of the switch is run on vacuum and is not making contact with the switch it self either worn contacts in the switch itself **** as an obstruction as well or the vent door is stuck in just that position either behind the glove box or the ash tray are the vacuum lines one of them may be pinched off or the door needs a bit of help until you can free it up

Posted on Sep 08, 2009

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1 Answer

Car heater blows cold air


It could be the heater control valve make sure the vacuum line is connected to the valve and that it is working properly. If it is not replace the valve. Hope this helps.

Jan 09, 2014 | 1999 Chevrolet Blazer

1 Answer

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This could be the problem, in center under the dash.

Nov 24, 2013 | Chevrolet Blazer Cars & Trucks

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Heater blowing cold air replaced thermastat next day heater blowed hot then it started blowing cold again has a new radiator and the water is not low


Flush coolant system out first with prestone or peak coolant flush if problem still exist replace heater core.

Apr 05, 2011 | 2001 Chevrolet Blazer

1 Answer

Air conditioner charged won't blow cold air, heater core will not let cold air enter into the vehicle. If I close off the heater it will blow cold air. Heat blows all the time even in off postions


It sounds like you either have bad controls or stuck dampers in your vents. The stuck dampers are usually caused by plant debris getting in to the air system.

Jun 07, 2010 | 1998 Chevrolet Blazer

2 Answers

My 99 Blazer won't blow hot air. The Heater core


The problem was a vacuum line leak. Replaced the line.

Dec 30, 2009 | 1999 Chevrolet Blazer

1 Answer

On hot days my A/C blows hot air and on cold days my heater blows cold air i dont know what the main problem is


your core could be clogged. you can flush it by removing both heater hoses coming from firewall and spaing the garden hose in one and then switching to the other until clean.

repair shops will not flush core when flushing coolant unless you ask them to.

Oct 14, 2009 | 1999 Chevrolet Blazer

1 Answer

No heat in 2001 blazer. only blows cold air


check for heater hose and or heater core clogged.

Sep 29, 2009 | 2001 Chevrolet Blazer

2 Answers

On my 1995 chevy blazer s-10 my face vents are not blowing air


Your heater valve is stuck open, also in a pinch you can crimp off your hose to the heater coil at fire wall. Try to find the heater valve vacumb hose under the hood see if it is bad and fixit. or some models have a cable to the valve could be broken. 

Jun 02, 2009 | 1995 Chevrolet Blazer

3 Answers

My 1999 chevy blazer will not blow heat


ther are two small tubes that open and close the valve to let in the hot air' one is from right under the carb intake and goes to the right (looking at the engine) right behind the fuse box. if there's o hole in that tube the heat will not work. just change mine becase the tube dry-rotted

Jan 08, 2009 | 1999 Chevrolet Blazer

1 Answer

Heater blows out cold air


sound like you need to change the thermostat it sticks closed so the hot water from the motor don't go through the heater core or the heater core is clogged .

Dec 20, 2008 | 1994 Chevrolet S-10 Blazer

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