I just replaced my heat core, but I'm still not getting any heat. I check the coolant and hose level and had the coolant replace about 3 months ago. The core is not plugged and the coolant is circulating properly.

 

What does your temperature gauge show for operating tempereature? The thermostat may have failed in the open position.

 

^^^i agree....are you getting cold air, warm air or what? Do you hear a swishing sound near the heatercore?

 

I just replaced the thermostat and its in the proper range.

 

how much did it cost to have the thermostat replaced?

 

what os this swishing sound, I am on my 2nd Blazer and both of them have made this sound, generally within the first 5 minutes or so after the truck has been started.

 

A water sloshing sound in the Blazer is probably trapped air in the system. Park the Blazer with the front higher than the back. With engine running, radiator cap open and vehicle up to operating temp, slowly fill radiator to capacity. This should drive out any trapped air in the system. Occasionally rev engine to force water to circulate through the block and back to the radiator, then when FULL, park on level ground and fill radiator to capacity if it's not up to the top. Sloshing sound should go away. If the radiator level drops after a few days or the sloshing sound returns, you may have a leak somewhere (either internal = intake manifold gaskets, or externel = sometimes very hard to see some leak prone areas, again intake manifold gaskets would be the culprit).

 

my heat is tempermental...when it wont work i turn the **** on,pop the hood and punch the condensor and it turns right on


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I'm sorry, when you say "punch the condensor", I don't understand what you mean. The condensor is in the front of the vehicle (assuming you have AC), in front of the radiator. How can you "punch" it?

If you meant that big black box on the passenger side of the engine compartment, the blower motor is in there and you could have a bad connection to the motor.

The other thing to consider, although it doesn't sound likely in your case, is a vacuum problem to the heater control switch.

I'd focus on the blower motor connection first (if that is what you "punch" to get it to work). Good Luck.