Engine won't get hot!

[K-5 Bomber]

And it's not the T-sat. I already changed it and tested the one that I pulled out. The old one was still opening at 195*. Now my wife has an '86 and it's doing the same thing. What gives? My heater used to be one of the best pieces of equipment on my truck. Now it just blows. Someone, please bless me with some divine insight!

 

[dhcomp]

the engine won't get hot, or the heater won't get hot? IF heater, your heater core could be plugged up pretty good...

 

[K-5 Bomber]

Heater core is brand new. Temp guage reads somewhere near 140*.

 

[76zimmer]

get a infrared temp gun, and check different areas of your cooling system. I'm sure the engine is putting out the heat, it just a matter of where its going. That temp guage may be off too. What shape is the radiator(s) in.

 

[gmc4cw]

if the heater core was just replaced it could have air trapped in it.

 

[4xcrazy]

if the heater core was just replaced it could have air trapped in it.

I think you JUST woke up when you posted this comment,,,,

You are going to have to some serious looking in to the system, fan clutch opperating properly, water flow, check the cap to make sure it's holding pressure, check the temps around the motor, SOMETHING isn't working like it should, and even if the t-stat was staying open, due to failure, you shold still get more heat than 140*, obviously it would heat up if it were stuck closed.

BTW, after replacing the heatercore,,,,i would HOPE your water pump would have enough pressure to push out the air in the system after running a bit

 

[Jason4x4]

are the heater hoses hooked up correctly, one to the intake or w/p, and one to the radiator, if they are both hooked up on the engine side it might not work properly, also, do you have a fan clutvh or is it run direct?

 

[Thunder]

Maby you have heater controll problems. Bad/missing Vaccum line or a broken or loose cable?