I already posted this but the topic was all wrong

So I have a surging idle problem that has slowly gotten worse over the last few months. For a while it was a little bit while it was cold. Now almost all the time. Well last night i was driving it (im a delivery driver) and it started sputtering a little in first and second and then the heat started shooting up. Went from the the center of hot and cold to the quarter hot mark and kept rising. I got it parked. let it cool for 2 hours then tried to drive it 4 miles home. Didn't make it because it shot up again and i shut it off right away and I "walked it" the rest on the way. When I turn on the accessory. The fan should come on right? Its now. We check the fan by hotwiring it. It still works. Any things I should check?

 

Coolant temp sensor. Its on the Thermostat housing. Your fan kicks on when you wire it straight to power right? Does it not come on when your car is on and just sitting? If it doesn't kick on its your coolant temp sensor

 

Your fan could be working but not come on and check your coolent 50/50 mix. hotwire your fan so it will stay on when you start your car. Termastat mit not be opening, change it out if it is old.

 

Yea. I will try all of that today. Any other ideas. please post!!!

 

make sure you dont have any bubbles in your coolant system

 

So I added more coolant. Let it heat up. Fan never turned on. Heater will also NOT heat up. Blows cold the whole time. Does that explain anything?

 

well then most likely its going to be your thermostat

 

any coolant loss?

 

Thermostat probably, and bleed the coolant system (let car run with radiator cap off)