I have an 88 FC SE, and i bought a used radiator off of an 86 FC.
There is no filler cap on the new radiator, but there is one on the old radiator that came with the car.

is this going to be a bad result in the future?
Do i NEED a filler cap on the radiator?
Can I use this radiator?
It seems that the 86 FC apparently can run without that filler cap. Can mine?

Any help would be appreciated.

thank you

 

there should be a cap on the water neck, I'm pretty sure you can run that radiator aslong as you have that where the upper radiator hose meets the front of the engine.

 

You need to have a filler cap.... either on the rad, or on the water neck. As long as you have one you will be fine.

 

how do you bleed this radiator? or cooling system??

 

radiator is stone cold after we started it up, and the heat started rising, so we killed it right away.
do you have to bleed these things?

 

you're not answering anyone's questions do you have a filler cap on your water pump neck?

also, I would probably replace your thermostat, it might be dead.

 

thermostat was just replaced, and yes there is a filler cap leading to the top hose. and that long *** neck haha

 

just turn the heater on when you fill it

 

does the car have to be running when i fill it, and also turn the heater on while doing so?

 

it doesn't have to be running, but sometimes you can get an airbubble in the heater core.... running the heat helps there.... it also helps to fill from the highest point on the coolant system.... like the filler neck!

 

ok i will try this in the morning. thank you

 

also while the car is running massage the radiator hoses you should see bubbles come out

 

yea.... massage those tubes baby! FEELS GOOD!!!!

 

Warm the engine up with the cap off. Don't worry about the cap on the rad. Make sure the caps and thermostat are OEM. Have the logicon (heater control) temp slider to warm, to open the water valve (listen for it moving), and avoid air pockets.

Tip. You may want to fill the engine side up to the thermostat with it off, then install thermostat. Sometimes, if the coolant doesn't reach the thermostat, it doesn't open soon enough after replacing coolant. Also, make sure the thermostat has a little vent hole and jiggle pin to let air escape. Also when filling, loosen the bleed plug near the top neck of the rad to let air escape. See FSM for orientation of the vent hole in the thermostat (link in my sig.). I have also posted pics about this...will look for it.

 

https://www.rx7club.com/showthread.p...rmostat+jiggle

Let us know how it goes...

 

so the thermostat i got, doesnt have the "jiggle pin", but the car runs cool.
however i need to put a better gasket on because its leaking a little ffrom the thermostat. *sigh*

on another note, this radiator I got off the 86 FC, doesnt have the pressure cap on the radiator, therefor it doesnt have an over flow tube. WTF??

what am I supposed to do about the overflow??
and why it idles so weird, i have no idea. until its warm.. then idles fine.

 

I bet the car you grabbed the radiator from has the water filler neck piece where the cap goes with the nipple on it for the overflow. I think I've seen that before

 

craaaaaaaap

 

you're in orange county? I see fcs on craigslist for cheap especilly broken ones. Some for parts, off someone $20 bones for their filler neck if its the right one else offer some 40 for a radiaotor WITH the cap on it and sell the one you got. I's help you out brosef but all my na goodies are gone

 

ya im in OC.. but the car is in AZ, so its kinda hard to get parts to it, etc. paps is the one doin all the work on it. lmao