Replaced all vacuum lines also.
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
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.
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
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!!
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
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.
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