ls/vtec just assembled..block and head was running before put together.. 95 ls block ..95 gsr head with a drag 3 kit...car started then started to overheat...at fisrt it revved fine then later it doesnt want to rev anymore..coolant flew everywehere when attempted to remove the radiator cap after about 5 minutes of just idling..

 

run a compression test.
also check the oil for coolant.

 

i did a compression test it was all from 165-170...high mileage block..im just using it temp till my other block gets back..so i didnt think of changing the headgasket..thanx for the reply..what would compression be if gasket was out??

 

That is seriously THE dumbest thing you can possibly do.....

 

ok i admit dumb thing but still could we stay on the topic please...anyone??

 

If compression is OK-> not head gasket. Plus you'd have nice plume of white smoke. Been there.

Overheating- cooling system - Did the fan come on? Are you getting a CEL? I'm hoping the water pump is running.

Try this:

1. Let the car cool down, like for an hour.
2. Open the radiator cap (make sure it's filled)
3. Make sure the heating seting is on full "heat"
4. start the car and let it idle. After about 2 minutes, you should be able to "feel" the lower radiator hose getting hotter (t-stat opens) and start to see flow through the radiator.
5. the fan shold kick on

If it failed to do any of these, you'd know where to look.

I'd check to make sure the fan switch is plugged in, it's different from the coolant temp sensor (It's right next to the t-stat) and that it works (try shoring it out to turn the fan on, etc)

Sean

 

thanx a bunch ill try that tomorrow and ill let ya know how it goes...thanx again

 

Did you even use copper head gasket sray on the gasket??? Always use a new head gasket and make sure you drain all fuilds and start from square one

Peace