warmeck

okay so my car was off and coolant was being pushed out of the overflow reservoir, i took some coolant out and it then drained back down into the radiator? should i worry about this? i cleaned up the coolant that spilled out; maybe i over filled it? i filled it up like 3 weeks ago which is why im kinda confused as to why it is happening now. Maybe because its getting warmer?

Fatdog2

Is your radiator cap a GM cap or a aftermarket?I had the radiator flushed and the mechanic put a stant cap on and had problems.I bought a GM cap from parts geek(I think)for $15.00 or so and have had no problems.Hope this helps.

warmeck

yeah its gm

shoebox

Make sure the steam pipe and overflow hoses are not swapped at the radiator (if you have done some recent work). The overflow goes to the very top port on the neck, under the cap.

Injuneer

Test it to make sure it will hold 18psi.

warmeck

Sorry my mistake meant to reply to this. How do I test this cap? I am going to replace the thermostat today. If it's easier to buy the cap then I will just go to dealer today and pick one up

moparman

Keep in mind these cars have their own special thermostat. The standard Chevy one won't work properly.

Injuneer

You can borrow a hand pump at an auto parts store. It can be used to pressure the radiator to test it for leaks, and should include an adapter to test the cap to see if it can hold the rated pressure.

warmeck

okay ill pick one up and if i find out that the cap is good and there is no leaks?

Injuneer

Dd you check post #4, above?

warmeck

yes i rechecked what the dealership did via shoebox guide everything checks out

warmeck

i also installed a new thermostat just to make sure and now it dosent overheat but it gets to about 230ish almost red zone

Injuneer

230 ish is not red zone.... stock programming doesn't even turn the 2nd fan (or both on high speed, depending on whether you have,an "early" or "late" model year 94) on until 235°F.

Is is still puking coolant out of the reservoir? If so, next is a check for hydrocarbons in the coolant.... an indicator of a blown head gasket.

warmeck

it is not puking out of the reservoir anymore im just super paranoid because i seen it get to that red zone. i tested my radiator cap and it held the psi stated but im going to replace it just to be safe. so 230 is normal temp?

Injuneer

No, still high, but not harmful. Typically you want it no more than the mid-point of the gauge, about 210°F. What temp t'stat did you get?