Question about 1999 Chevrolet Blazer

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Recently did head job repair on 99 Blazer. Filled radiator & resovoir. Heater not heatin. so I replaced thermostat, still no heat. Antifreeze capacity is nearly 3 gallons, I have only been able to

Replaced all vacuum lines also.

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  • Chevrolet Expert
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May have air trapped in the system check this as well let the engine run to normal opperating temp shut engine down feel of the heater hoses going in to the firewall are they about the same temp if one is hot and one not the heater core stoped up if both warm the problem is in the hvac system

Posted on Nov 23, 2013

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: 96 Blazer Overheating

Yes the issue is most likely an air block, jack the front of the truck up as far as you can, fill the recovery bottle and run the engine for about 10 min, then shut down and run cold water over the radiator, this should purge the air, recheck the recovery tank and refill as ness.

Posted on Oct 30, 2008

  • 1 Answer

SOURCE: No Heat for 2001 Chevy Blazer

All I did with my 1999 blazer is pull the a/c fuses from under the hood and heat blows just fine.
good luck

Posted on Dec 04, 2008

  • 6982 Answers

SOURCE: where is the heater control valve on my 1995 camaro 3.4 v6

If yours has a control valve, it will be inline in a heater hose just ahead of the firewall. before taking it out make sure it has a vacuum line attached. If I remember correctly, default is heat. I hope you checked the vacuum motors on the heater box and made sure that the plenum doors are operating and not jammed while you had it out!!

Posted on Oct 06, 2009

  • 112 Answers

SOURCE: antifreeze leaking into cab under glove comp.

heater hose or heater core you can solder the heater core if you can find the leak oh and if the rest of it is good

Posted on Nov 22, 2009

  • 3 Answers

SOURCE: how to make heater get hot in 94 chevy caprice.

This is a very common problem with the 94, really common with the LT1. I have done everything I can think of with my Caprice, and lets just say I don't drive it in the winter anymore.

Posted on Jul 17, 2010

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Replaced thermostat and flushed out heater core 3 times 3 times it was cloggged, flushed system twice got good radiator flow and ther very hot just heat like luke warm one line in to core hot one oming out...


If the heater core is not damaged or leaking ie: if you don't see coolant on the INSIDE of your windshield or coolant on the floor inside the car then chances are you may just need to BLEED the radiator.

remove radiator cap

Fill coolant resovoir to the cold line if the engine is cold from sitting overnight.

Start engine with cap off

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While waiting you will see a big gurgle of air bubbles come out and the coolant level will drop

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When the fans come on and it stops gurgling air install the radiator cap

You are done

Watch the coolant level for the next few days and top off in the resovoir as needed to keep it filled.

Your heat should be very hot now providing you installed the correct oem thermostat correctly.

Hope this helps

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My 1999 chevy blazer will not blow heat


the age of the vehicle does suggest the heater core could be plugged, when the motor has been run awhile where is the temperature gauge (if it has one). ?
If i remember right it's not that bad a job to replace the heater core in those trucks... but it's been awhile for me. I would suggest some cardboard or something in front of the rad to see if it warms up at all. if so it is likely a thermostat that needs to be replaced.

Robert

Dec 15, 2008 | 2000 Chevrolet Blazer

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