Random Overheating 03 Dakota

[y1fsm8s]

Hello all, I am new to these boards and have a quick question.

I drive an 03 3.9L v6 dakota 2dr. I have been experiencing random overheating as of late. It happened once or twice before, but now it is becoming more and more frequent. I am located in chicago so it is quite cold right now. I have yet to figure out a pattern of how it is doing it, but im trying. I let my car warm up for 15-20 minutes every morning and first off my heat does not work unless im driving. When i first start driving i notice the temp gauge start to rise quite rapidly almost into the red, but then the heat kicks on and the temp gauge goes back to normal. It will run fine for a while then randomly the temp gauge will rise and the heat will shut off again. then one minute later or so, it will be back to normal. It did this to me 4 times this morning on the way to work (45 min drive). I have no idea what could be causing this. I have no check engine lights or anything like that. Any help would be greatly appreciated.

thanks!

[Airjer_]

Your low on coolant. No heat until your driving tells me your low enought on coolant to leave the heater core empty until the RPM's are high enough to circulate some coolant through them. I would bet the radiator is about half empty.

[y1fsm8s]

Originally Posted by Airjer_

Your low on coolant. No heat until your driving tells me your low enought on coolant to leave the heater core empty until the RPM's are high enough to circulate some coolant through them. I would bet the radiator is about half empty.

Well you were right. I had little to no coolant in my tank. I filled it up and hopefully that does the trick. Maybe i have a coolant leak if it was almost empty?

[Airjer_]

If its low its has to be going somewhere. Some common things are radiators, waterpumps, and the gasket for the t-stat. Since you haven't noticed it leaking I would take a close look at the t-stat housing area. If its full off dried up coolant that may not be a bad start to replace the gasket.

[y1fsm8s]

Originally Posted by Airjer_

If its low its has to be going somewhere. Some common things are radiators, waterpumps, and the gasket for the t-stat. Since you haven't noticed it leaking I would take a close look at the t-stat housing area. If its full off dried up coolant that may not be a bad start to replace the gasket.

Can coolant be red? And sorry but i am a total car noob. what is a t-stat?

[y1fsm8s]

I replaced the coolant and ran the car for a while, but still get no heat off the start. Only get heat when driving. Any ideas?

[Airjer_]

If you ran it that low there is air in the system. Its going to take a while to get the air out. After driving it let it cool down and recheck the level and top off as necessary. You can also let it run in park with the radiator cap off to help burp out the air. The heater core is the highest point of the cooling system and is the first to stop working when low on coolant and the last to and hardest to "burp" the air out of when it has been run low.

[Scrapper]

you may want to put a new thermostat in it if you haven't changed it fo awhile? and can you hear your blower motor running?