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I have a 1999 chevy blazer the heater wont work change the thermostat and flush the core still no heat the engine heat normal dont know what to do next the big hose gets hot but small does not

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Are the small hoses to the firewall heating up? ck the heater control valve

Posted on Dec 14, 2016

Testimonial: "the big hose get hot but the little one does not and it has be back fuse"

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1 Answer

No heat in 2001 chevy nblazer


If the thermostat is not working the engine will not warm up. So the temp gauge should show cold after running the engine for 10 or 15 min.
If the engine is warming up but the heater hoses are not warm, you could have air in the cooling system.

Sep 11, 2012 | 2001 Chevrolet Blazer

1 Answer

I have no heat in my 1999 chevy blazer.It has a new thermostat and the engine temp is normal.


back flush your heater core. find the hoses under the hood that go to and from your core and reverse the flow with a garden hose of plane water. you will notice if your core was plugged by the color of the water comming out. put the hose thats coming out of the core in a bucket to see this.

Jan 09, 2011 | 1999 Chevrolet Blazer

3 Answers

My heater takes a long time to warm up


You may need a new thermostat. They are cheap and easy to install on a blazer. They sell different temp ones. ask for a higher temp thermostat if you want warmer heat. Also it would be a good idea to get the cooling system flushed. That helps a lot.

Dec 29, 2009 | 1999 Chevrolet Blazer

1 Answer

I have a 2003 chevy blazer but no heat,nothing but


Start by flushing your coolant system and replacing your thermostat. You may later find that you have a clogged heater core.

Dec 27, 2009 | 2003 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

4 Answers

No heat in 2000 chevy lazer just replaced thermostat


I own a 200 Chevrolet Blazer and I have it for over 4 years mine does the same thing I actually just noticed my heat getting less. My husband found the best way to fix it and the cheapest way to fix it. He takes the tube off the heater and attaches a water hose to it and flushes out the gunk whatever is blocking the hose and after he does that the heat works great. No cost and if I wanted to I could do it because its so easy. My husband did some searching on the internet and a person that this happens all the time to let me husband know. If you need more info let me know I can ask my husband he isn't home at the moment I so I don't have exact details. Thanks Amy

Dec 24, 2008 | 2000 Chevrolet Blazer

1 Answer

No heat


if engine temp is normal after running awhile. i would try to flush the heater core.(disconnecting the heater hoses from engine and flushing separately) ford cars and trucks have a "brown coolant" problem and the coolant will eventually clog heater core.

Dec 13, 2008 | 1999 Mercury Sable

1 Answer

Heat dont work


Sounds rather silly,but a mouse could have made a home in the duct work! Do check the valve on the heater hose connection, as this more likely your prob! Frankster016

Nov 30, 2008 | 1996 Chevrolet Blazer

1 Answer

Heater keeps blowing hot air for awhile then it blows cold. replaced thermostat and did not fix the problem. was suggested to change heat sensor. need to know where it is located.


if youre driving down the road with decent heat and all of a sudden it gets cooler, and the engine temperature remains normal, i would strongly suggest flushing out the heater core at the firewall in engine compartment, very common problem due to the dex-cool antefreeze used be GM.

Nov 17, 2008 | 1999 Chevrolet Blazer

3 Answers

No Heat for 2001 Chevy Blazer


what about electric system, is it connected could me a loose wire that disconnected on ur heater, check on that

Oct 30, 2008 | 2001 Chevrolet Blazer

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