thanks for all the help guys. i asked my shop teacher about this today and he said, i changed the characteristics of the cooling system, so it may read differently. would the larger radiator make the car run hotter though? i thought it was supposed to do the opposite.

 

you've changed the characteristics of the cooling system by making the engine run cooler. having your needle fluctuate the way is it has nothing to do with you changing your radiator. like many said before, you probably have air bubbles in your lines.

 

ok, ill try bleeding the cooling system. thanks again.

jon

 

no prob.. :thumbup: keep us posted!!!

 

ok so i tried bleeding it. to start off, i took off the radiator cap because i didnt find the bleeder nippple. some coolent overflowed out and i whiped it up. i started up the car and nothing was happening. as the engine warms up the coolent starts flowing out slowly ( no bubbles ). so i stick my rag in the radiator to soak up some of the coolent. the coolent keeps rising as the engine gets warmer. later on it stops expanding so i shut offf the engine and give up. now what!? lol

 

did you run your heater full blast to get coolant flowing through the heater core?

 

actually he hasn't changed the heating system that much.

Lets assume the koyo is a larger more efficient radiator than the stock unit.

He has increased the coolant capacity of the cooling system. The increased capacity gives him X amount more water.

The unit is more efficient than the stock radiator, so water is cooled faster or to a lower temperature.

Both of those things would mean his car should operate at an overall cooler temerature.

But since the thermostate controls the radiators use....

If the radiator can cool the water cool enough that the thermostate closes on the freeway, he will probably see the car operate on city streets and spirited driving at similar temps as his old unit.

He will just have more heat capacity.

 

racer- you need to find the bleed valve. The nice thing about air bubbles in the cooling system is they don't move around much, which is presumably why you have this problem in the first place.

And turn on the heater full when you do this, it opens up the lines to the heater core in the dash

 

Nice picture......That was pretty helpful of you :thumbup:

 

yes, i had the heater on full blast. LAUBO says there isnt a bleeder valve for my block? so what should i do? how do you get the air bubbles to move around? i read somewhere about the thermostat being stuck open or somthing..does that have anything to do with it?