Heater no blowing hot?

BLACKOP555

MECHANIC
10,371 POSTS

The door is a little plastic door that causes the air to be pushed thru the heater core when it is hot. And when it is set to cool it bypases it.

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Thursday, July 16th, 2020 AT 10:28 AM (Merged)

ALEXIS9

MEMBER
1 POST
1998 CHEVROLET BLAZER
4 CYL
4WD
AUTOMATIC
148,000 MILES

My truck fogged up last night and I started smelling antifreeze, but I still get heat, but if I turn it on it fogs up really quick now I have no moisture on my passenger side carpet but I was told it was the heater core. But could it be the t-stat?

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Thursday, July 16th, 2020 AT 10:28 AM (Merged)

HMAC300

MECHANIC
48,601 POSTS

Nope it 's a heater core. The antifreeze is probably going out your a/c drain under the truck. This one is'nt easy as you haveto pull the dash to put the heater in.

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Thursday, July 16th, 2020 AT 10:28 AM (Merged)

J.CARTER4088

MEMBER
1 POST
1998 CHEVROLET BLAZER
6 CYL
4WD
AUTOMATIC
160,000 MILES

My 1998 s10 blazer is having a heater problem it blows out heat but not sufficiently enought the blower motor is pushing out the air its just not heating up as it should. Theres a slight antifreeze smell I was just wandering if it a heater core problem and I have to replace it or try to get it flushed if it could be clogged. Any answers would be great I need my heater considering its -11 out now!

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Thursday, July 16th, 2020 AT 10:28 AM (Merged)

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

If there is no coolant leakage anywhere (around heater hoses under hood or in cab on passenger side floor) then most likely the heater core needs flushed. If there is leakage then it will need replaced, or perhaps just a hose to the core needs replaced

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Thursday, July 16th, 2020 AT 10:28 AM (Merged)

STING48640

MEMBER
1 POST
1998 CHEVROLET BLAZER
6 CYL
4WD
AUTOMATIC
155,000 MILES

I have a new theromstat and its working fine. I put antifreeze in the radiator and still isnt recieving any heat

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Saturday, November 14th, 2020 AT 4:15 PM (Merged)

PEAR69

MECHANIC
1,482 POSTS

� After the engine has run for about 30 minutes or so, what is the engines' temperature? After this period, is there any pressure in the radiator? Also after this period, Is there a big difference in the temperature of the upper radiator hose, compared to the lower hose? Are they too hot to touch for a while?

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Saturday, November 14th, 2020 AT 4:15 PM (Merged)

RPAPADUKE

MEMBER
1 POST
1998 CHEVROLET BLAZER

Heater problem
1998 Chevy Blazer 6 cyl Four Wheel Drive Automatic

no heat coming inside no fuses blown get air but no heat thermostat new computer controled

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Saturday, November 14th, 2020 AT 4:15 PM (Merged)

BMRFIXIT

MECHANIC
19,053 POSTS

Engine reaching operating temp ?
if not check thermostat and coolant
if it is check heater hoses both should be hot if not heater core need to be flushed
if they are suspect blend door
good luck

need manual CHECK IT @
https://www.2carpros.com/kpages/auto_repair_manuals.htm

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Saturday, November 14th, 2020 AT 4:15 PM (Merged)

JAMESMOTT82

MEMBER
1 POST
1997 CHEVROLET BLAZER
6 CYL
2WD
AUTOMATIC
160,000 MILES

I am having problems with my blazer not getting hot the heat is luke warm and the temp of the truck never gets above 170 I have replaced the thermostat twice and still same thing also there is no pressure on the upper radiator hose ever I can drive down the highway for hours and still no pressure on the upper hose what else could it be

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Saturday, November 14th, 2020 AT 4:15 PM (Merged)

BIGJIM79