snake doctor

My work truck is a 97 F-150 4x4. I replaced tstat and flushed coolant. since then I have very little heat. I'm pretty sure I have all the air out of the system. My temp gauge seems to be way on the cool side. Could the sensors cause heating problems?

Fast Hampster

Welcome to the forum! No, sensors can't cause heat loss. Something must be wrong with thermostat - looks like it's stuck open. It also affects mileage because engine is not operating at optimal temperature.

torkum

Did you use the bleeder screw to release the air. Tritons are bad to trap air in the engine after a coolant repair.

dewman

Make sure you installed the thermostat with the correct side up.
If reversed, the coolant can't flow and you will not get any heat.

Good old Bill

Agree with all comments posted. Would you please clarify a couple things. Very little heat? Assuming you are talking about the heater in the vehicle. Could be air bound here. Both heater hoses should be very warm or even hot to the touch.
Temp gauge, was the correct t-stat range used. Believe should be 192 degrees. Again top radiator hose should be much hotter then the lower to verify proper circulation and operation.

texasedition

My guess is that your tstat is stuck open. Replace it, and give ot plenty of time to burp.

texasedition

When was the last time you did a proper coolant flush on it?

snake doctor

First let me appologize, I'm new to the site. Still trying to figure things out. Correct tstat used and it's working properly. All hoses are warm to touch. I'll have to check if botomm hose is hotter. When I flushed the system I did not use the bleeder valve. not sure where it's located. Thanks!

snake doctor

No, I did not use the bleeder scew where is it located? Thanks for the help.