hey....iv got an 87 rx7 n/a. i replaced the thermastat, rodded the radiator, and put an electric fan in it. i dont see any leeks in the water pump so that is fine. the car overheats when it idels and overheats when its going down the road. Iv been stuck on this problem, so if u have any suggestions please lemme know!! thanks

 

do you constanly have to fill the rad???
does your exhaust smell sweet??
you could have a housing seal thats leaking coolant into you engine..
do a coolant pressure test, if it holds pressure i have no idea, if it leaks pressure find the leak, if the leak is not visual you might need a rebuild.

 

What do you mean by rodding the radiator? Do you still have the plastic belly pan thingy? Did you use an OEM thermostat?

 

How old is the water pump?

 

did you wire your efan to turn ON?

 

Radiator cap?

 

my exhaust doesnt smell sweet....i dont have to keep filling the radiator up. I think ill look into doing that test and try to find a leak. my radiator still has the plastic belly and its the original thermostat. i dont know how old the water pump is ( i bought the car about a year ago.....and i havent changed it so who knows?)

how does a coolent presure test work? and if it does leak....what needs to be rebuilt? the whole engine?

 

Nah, don't worry about an engine rebuild unless she's eating the coolant...

Original thermostat? Man, replace that sucker first. It's cheap, easy to get to, and just may solve all of your problems

 

i did replace the thermostat.....i ment to write water pump.

 

Ahh, OK...You've checked the rad, t-stat, cooling fan, and the water pump doesn't leak...Although that doesn't mean that the impellers aren't corroded to nothingness, which would cause overheating.

Did this happen all of a sudden, or did the overheating take time to progress?

And what are you calling "overheating"? Steam gushing out after a ride, high indication on the gauge? Engine glowing red?

 

is it oem thermostat??

 

is the thermostat in upside down?

 

Maybe air in the system?

 

well it kinda just started happing in like a weeks time....... the temp gauge is showing like three quarters of the way (i shut it off b4 it gets to high) and when i shut it off the coolent is boiling and the engine smells real hott. the thermostat is in correct cus i can tell when it opens up. so maybe its just that the propellars inside the water pump are coroded.

 

and it did steam the first time it happend cus i let it get to hott.

 

im gonna go take the water pump out now....thanks for the advice. ill let u know tonight wats up if u want to know. thanks

 

well the water pump wasnt the problem.... it was the electric fan...it wasnt pulling hard enough...so i knew i had to put a stock clutch fan back in. so i took my broken one and bent the peice of metal outwards. So now the fan is always on, robbing my hp, but hey its doesnt overheat

 

dude it's the water pump samething just happened to me rip out the old dirt monkey and slap on a new one/ rebuilt one