i gotta 86 305 TPI z28......

what ive changed:

new 3 core radiator
new water pump
new thermostat (180 or a 195 i forgot)
new sensors (forgot what their called)

everytime i drive a long distance, turn off the car all you hear is the overflow rumblin, smoke comin out of it wit a lil bit a anti-freeze drippin out.....

idk what else i can do to make it stop doing this.....all my fluids are good, i even checked the oil to see if the head gasket was goin but the oil is good.....

im at work right now so i cant type in other stuff, but if theres any other info you need then ill post it when i get back home

thanks to all that help out....

 

Is the gauge showing that it is overheating? Or are you just hearing coolant bubbling into the overflow when you park it. When the car is parked, some coolant will bubble into the overflow since the water pump is no longer running and the fan is shut off. That is fairly normal (assuming it is not bubbling over). If the gauge is staying in the cool zone (out of the red, probably 220 or below), I'd not worry about it. If it is dripping coolant, you will need to find where that is coming from and correct it (replace hoses, tighten clamps, etc).

Hope that helps.

 

Air might be getting in to the system & causing this as well.

 

Buy a new radiator cap. Dollars to donuts that's what it is

 

Timing out of adjustment can cause it to run hot also.

 

sometimes when i park it ull hear a lili rumble from the overflow, and sometime it soundsl like its just gonna erupt....the temp goes up to 220, fan kicks on temp drops, n then the temp will sometimes go above 220. its not dripping coolant at at. i need to worry bout this cuz this is my only transportation and i dont have the money to get it rebuilt, buy new engine, or a car....also when the temp goes above 220 it feels like the car just gets weak

 

how do i check for this??

 

good idea, ima pick one up today then

 

true, forgot bout that

 

I don't know but my timing curve is a little more aggressive than stock but I don't have these problems. I still think the problem lies within the cooling system. Are the fans coming on at the right points

 

I dont know but a good shop will know because you have to use a vaccum to vaccum out the air bubble.



Was watching Boyd Coddington do this on Amercain hotrod last year.

 

when a car gets hotter, they lose power, a cooler car is better they say. sounds like something is up, whats an hour of labor worth to save your car, take it to get checked, youll be glad you did. mine drips coolant out of the cap cause the cap dosent get tight its cheap plastic gm junk, so when i hit bumps, and we know this cars take bumps well itll fling some out, but if its bubbling like that its probably boiling over, maybe the guage is bad thier not to accurate anyway, pick up those coolant tools from your local advance thier nifty, i got a set myself

 

This usually only happens when the radiator is lower than the top of the engine (ie.corvette,coustom rods etc.). Corvettes have a bleeder up top for doing this. This is not to say you don't have a air pocket ,but I dout it. Change the cap and if you have air cond. clean out between the rad.and the condenser,this area always catches crap and lodges in there,which cuts the air flow. Last but not least (did not read all posts) make sure you have that air dam under the radiator and it is not folding back at speed.

Also check you lower rad hose,it should not be soft.

 

ummm air dam? your talking about what directs the air into the intake, correct?? and what do you mean by "not folding back at speed?"

can someone please explain how changing the radiator cap can stop an overheating problem??

 

yeah the fan kicks on at about the 220 mark........