5.3ls in E30 overheating

[mzracer13]

Having issues with cooling.




i have a 3core e30 radiator remounted farther forward and lower. I have a 2quart fill tank mounted high on the left rear of engine bay. The steam tubes are routed into the overflow tube AND BACK TO THE FILL TANK. I am not running a thermostat. The engine overheats even with the fans running. When I feel the radiator, it is cool. Obviously, I have a air bubble. The question is,: How to remove it . The bubble is in the top hose between the pump and the radiator, I think. I am about out of ideas for getting this thing to cool. Any ideas?

[roguetoaster]

Well, is the water pump actually working? Have you continued to fill the system to overflowing as you run the engine, perhaps from both the overflow and the radiator cap (should yours have one of course)? Is the overflow absolutely the highest point in the cooling system? Perhaps try changing the angle of the vehicle relative to level as you bleed the system, both front down and front up.

So many unknowns, but systems will bleed if liquid is circulating and air has a chance to be displaced/escape to the highest point without getting trapped by a restriction or siphon effect.

[The Dark Side of Will]

Overall pics of the engine bay?

Is your bleed line uphill all the way to the fill tank or does it have a low spot?

[mzracer13]

Yes,I have already replaced the water pup. Bleed line is uphill. Took some pics, but too many hoops to jump to put in here.

[Pootis]

When you filled it with coolant did you fill the engine first by pouring coolant into the upper radiator hose until it was completely full? That is how everyone says to fill the ls with coolant.

[The Dark Side of Will]

Took some pics, but too many hoops to jump to put in here.

Do you want help or not?

[tyeler18]

Is your fill tank a pressurized SURGE tank or just an overflow? Where are you filling the system from? The fill point obviously needs to be the highest point so if your tank isn't a surge tank you're going to air lock wherever you're filling from. You could use a vacuum filler to fill it, but you won't be able to check the fluid level if that's the case. With no t-stat and still air locking it sounds like your fill point isn't the highest point.

[sgtskid]

My water pump was sitting higher than the radiator. I drilled and tapped a port in the top of the water pump and ran a hose to the top of the radiator to let air out from the water pump. Centrifugal pumps are no good at moving air....

[The Dark Side of Will]

Lol... *cough* TURBO *cough*

[mzracer13]

When you filled it with coolant did you fill the engine first by pouring coolant into the upper radiator hose until it was completely full? That is how everyone says to fill the ls with coolant.

That worked

[Pootis]