got a 95 3.9 auto with little heat i have replaced water pump about a month ago flushed the heater core in early nov. and new 195 stant thermostat in it and i put an aftermarket electric temp gauge in it and it barely reads 100 degrees and only about luke warm air and i replaced the temp sensor (single wire) when i first put the motor in in april 08 and now i am runnin out of ideas thanks for the help guys

 

I'd throw a new thermostat in, it's possible you got a bad one out of the box.

 

Where did you put the electric temp gauge?

 

Possible the heater core is clogged even after being flushed.

 

There are a few possibilities here, yes, the stat could be lodged in the open position thus it's bad. Depending on which direction you flushed the heater core could make the difference. if you flushed in the direction the water is already going it possibly didn't give the desired effect. You may want to flush in the opposite direction (kinda going against the grain if you will). This may clean more of the possible clog. Just a thought. Crazy poses a great question, where did you place that electronic sensor? How about the heater control lever? Are you sure that it is operating properly? Make sure the movement is fluid and it fully operates the gate to allow the heat to get into the cab. If all of the above checks out then, how are the actual heater hoses? When was the last time they were inspected or replaced?

I hoped I've stirred the creative thinking jucies...

 

when the engines up to temp squeeze the top radiator hose, if its not pressurized it may be the radiator cap. i would change it anyways if its origional, no heat on mine and it was the cap

 

crazy i put the temp gauge on the piller in a gauge cage and when i flushed it i went both ways but i will try it again when its warm cause its like 3 degrees here and garden hose is froze and ill go ahead and put a new thermostat in it. Thanks For the help guys I love this site

 

he means, where did you put the sensor for the temp gauge... not physical mounting place...

 

Yes what he said.

 

it is on the single wire sensor its purple and yellow all i did was splice in to it and now since i changed the thermostat still not much heat