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My heater is not working why?

Tiny
PEREZ GARCIA
  • MEMBER
  • 1 POST
  • 2001 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 65,000 MILES
I have no heat. It blows normal no leaking anywhere I put a new thermstat in but still nothing. Could it be a fuse?
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Saturday, November 14th, 2020 AT 4:04 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
When vehicle is hot feel the heater core hoses and get back to me with what you find. let me know their temperatures. of both of them. be specific.

This guide will help fix it

https://www.2carpros.com/articles/car-heater-not-working

Please run down this guide and report back.
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-1
Saturday, November 14th, 2020 AT 4:04 PM (Merged)
Tiny
KAREN BOBO
  • MEMBER
  • 1 POST
  • 2001 CHEVROLET BLAZER
  • 4.3L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 125 MILES
Not blowing hot
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Saturday, November 14th, 2020 AT 4:05 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,752 POSTS
That's way too much information to digest, so you might want to start by checking the coolant level. Feel the upper radiator hose and the two heater hoses. They should be too hot to hold onto for very long.
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Saturday, November 14th, 2020 AT 4:05 PM (Merged)
Tiny
BARB SMART
  • MEMBER
  • 1 POST
  • 2001 CHEVROLET BLAZER
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 11,100 MILES
My blazer has no heat. We have replaced the thermostat, flushed the heater core and recently replaced the intake manifold gasket. The blowers are working fine, could this be a problem with the vacum lines, if so, where are those located?
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Saturday, November 14th, 2020 AT 4:05 PM (Merged)
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
See if your blend door is working ok first. You may have a vaccum line disconnect by the engine. If not try to back flush the heater core and make sure it is not plugged. I know you said you did flush it, but did you back flush it. Some times you have to do a super flush on the heater core to clean it out. Prestone makes a flushing kit that works great for this
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Saturday, November 14th, 2020 AT 4:05 PM (Merged)
Tiny
CLIFF DEMOS
  • MEMBER
  • 2 POSTS
  • 2001 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 113,008 MILES
I have auto temp control and cant get any hot heat, only luke warm. Anti freeze is clean and the temp of the blazer is about 180. Could it be my temp dial and if so is it expensive?
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Saturday, November 14th, 2020 AT 4:05 PM (Merged)
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok on your truck it uses a blended heater system. Meaning that is uses a door to direct air through the heater core. The more through the core the warmer the air and the less through the core the cooler the air. So what needs to be checked is the operation of this door. Is there anything that fell down the vents that could be blocking the door? Now here is a pic of the heater blend door actuator and it should only take about an hour to replace.


https://www.2carpros.com/forum/automotive_pictures/249564_538244_1.jpg

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Saturday, November 14th, 2020 AT 4:05 PM (Merged)
Tiny
CLIFF DEMOS
  • MEMBER
  • 2 POSTS
Could you explane where vthis is located. Is it visable by just looking under the hood and if so does it look exactly like the pic or could it look a little different?
Thanks
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Saturday, November 14th, 2020 AT 4:05 PM (Merged)
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
It is inside the truck on the passenger side on the heater box behind the glove box. I am not sure exactly were but here is a pic of the heater box part that is behind the glove box. Hope this helps if not get back to me and I will see if I can find better pics ok.


https://www.2carpros.com/forum/automotive_pictures/249564_heater_box_1.jpg

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Saturday, November 14th, 2020 AT 4:05 PM (Merged)
Tiny
SUSANST58
  • MEMBER
  • 1 POST
  • 2001 CHEVROLET BLAZER
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Not throwing no heat husband flushed radiator didn't work change and put new thermostat in it and new radiator and fresh antifreeze and still no heat what else could it be beside heater core also having trouble if we push it to make it up a hill and we take it slow it goes but if he push it to make a steep hill it wants to die before we reach the top he cleaned out the mass floe thing and change air filter but still wants to die runs good any other time only on hills what could that be is it time to junk it
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Saturday, November 14th, 2020 AT 4:05 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
It sounds like you got a couple different problems? As far as performance issues, how long since a tune-up? Are there any applicable trouble codes? To check codes, yourself, at the least, you need an obd2 code reader. Some of the national brand auto stores will check codes for free, if there are any.

If the heater isn't blowing warm air, fell of heater hoses, both should be hot. Could be heater core issue, also, check temp door under the dash.

When going up steep hill, will the tranny downshift to lower gear? If you downshift does it do better going up the hill?
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Saturday, November 14th, 2020 AT 4:05 PM (Merged)

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