OBS NO HEAT !!

[catlinB]

so my truck will not put out any heat.... and the temp gauge on the dash is still reading normal were it always did befor i lost my heater, the fan still blows cold air , and the heat knob is turned to the hot side, all the controls are working , truck does not over heat or anything and no steam or anything from anyplace and no water in the oil

so i swapped out my heater core for a new one and also put in a new thermostat..... and i'm still getting no heat !! and one line will get hot (the one coming from the block going to the heater core)
and the one coming from the top of the water pump to the heater core stays cold.... the water pump was just put on my truck new befor i bought it last year so its probly 2 years old ? , i'm at a lose why i have no heat!! ??? any ideas??

also the radiator in my truck is the one that has no cap right on the rad.... its one that has a little copper like canister off to the passenger side with the cp on it there... and the feed line goes out the bottom and to the bottom of the water pump ???????

i've also left it high idleing in the yard with the cap off for 2 hours in case it was air locked.....

[catlinB]

bump bump.....

[BuickLeSabre1960]

See if the two small hoses going into the heater core are getting hot and if the both are then check and make sure the blend door is moving properly

[catlinB]

the door is moving properly

only one hose will get hot-the one coming out of the passenger side of the block

the hose coming from top of the water pump is staying cold

[catlinB]

any other ideas guys ???

[bob harris]

THERMOSTAT JAMMED CLOSED ??

[catlinB]

Originally Posted by bob harris

THERMOSTAT JAMMED CLOSED ??

i've had this same problem with the old thermostat in (that i just put in the truck in October) and i put another new one in yesterday with the same results, but the heater was working fine last week.... my coolant temps are good also in the motor i had that checked today on a scan tool. it just seems like its wont circulate through the heater core, and i just was out and pulled my lines from the heater core, the lines are not plugged im at a lose here.... it does not seem to be air locked but i cant tell because my cap is not on the radiator like i said in my first post

[catlinB]

bump bump bump

[bob harris]

HEATER CORE MUST BE BLOCKED

[catlinB]

heater core is new, and i dont think anything was wrong with the old one because i can blow through the old on no problem with no restrictions the same as i could the new one befor i installed it . i blew through both lines, one going to the block and on going to the water pump, both of them had no restricitons, also they both pour out liquid