put in a new thermostat just in case the old one was no good and now its worse, runs almost at the red line. Bled it out again, one gallon this time and still running hot. I NEED HELP!!!!

 

Ok, i decided to bleed it one more time, temps are now at the red line. I figured for the heck of it i would see what temps i get with my temp gun, (i am big into RC stuff) and I am getting 220 at the bleeder housing, 175 on the upper hose, 190-198 on the engine itself at the base of the valve cover, when you open the hood it doesnt seem very hot at all. Is it possible the sending unit is not working correctly? It reads at the bottom of the line when you first start it but quickly climbs to the 3rd-red line (within 10 minutes) and its in the 50's here. Where would I find this sending unit on the engine?

 

Does anyone know where the temprature sending unit is on a 1986 porsche 944, not the one for the fan but the one thats for the temp guage, i cant find this anywhere, even the repair manual i have. Even though its at the red line i take the temps with a temp gun i have and it reads around 220 at the bleeder housing, 190 at the head, 180 at the upper radiator hose.

 

Hey, another thing you should look at is on the reservoir by the cap is a rubber hose, that is your pressure release hose. Make sure that that hose isn't bent or stopped up. I just had the problems that you're having with my car and fixing that tube solved my problem.

 

Thanks for the reply, i just checked all the hoses coming from the reservior and they all seem fine, its very strange. I honeslty dont think its overheating unless a 210 degree engine is overheating, thats the temp i am getting on the engine itself with a temp gun. I would think that the needle on the red that it would be warmer than that, the engine doesnt seem to be hot, you can usually smell or feel the heat from a hot engine.

For the life of me, i cant find the temprature sending unit, lol

 

ok, the bottom radiator hose is ice cold, top is hot. I am going to remove the thermostat tomorrow and see what the deal is, i have put 2 new ones in but what else could it be, i will run without the thermostat and see what the deal is.

 

that's normal. if you look back in this forum you'll know why.

 

could you enlighten me? I have searched these and other forums with no answer. Why not just give the answer? I dont think an engine overheating orsaying its overheating is normal.

 

sorry bout that, i was wrong.

 

ok, put another thermostat in it, this one has a small opening on it, was told this is the correct one, its 180 not 195 like the one i just put it, runs in the middle now or goes to the 3rd line. Bleeding the air out of it and seems like its getting better, the serpantine belt flew off so i had to have it towed and replaced today and the mechanic took the the thermostat out to check for me and thinks thats the problem, i will let you guys know.