Hey I have an ef hatch wit b series swap!! I'm wondering why wen the car is warm water starts to come out through the radiator cap and the little hose!! Even the water resavoir starts boiling! The problem is that wen this starts happening the cooling fan does not turn on and the temperature gauge is normal!! Anyone kno why this is happening?

 

Does the car ever go above the normal spot on the temp gauge?

Seems like you need to do a leakdown test and see if your headgasket it on its way out. You can rent the tool from Advance Auto or maybe AutoZone (not 100% on them)

I'v seen where headgaskets are blown and it pushes air back into the overflow tank due to the blow by where the gasket is ripped, thus creating bubbles in the overflow tank.

 

I already changed the fan switch and put another radiator! It still did the same thing and the cooling fan still did not turn on!! Just this time I kept the car on for longer and it started to overheat now!! Wen it was overheating the cooling fan did not turn on!! So its the head gasket?

 

anyone out there?!!!!!!!!!!!??

 

Check fuses.

Short the two wires on the thermo switch.
Run the engine - shorting those two wires should close the relay and make the fan come on.
If it DOES come on then you have a problem with your thermo switch.

If it does NOT come on then connect the fan directly to battery (polarity does not matter).
Your fan should run.
If it does NOT run then replace the fan motor.

If it DOES run then troubleshoot your fan relay and wiring.

 

yea i just bought a new fan switch!!! and that was not the problem!! my fan still does not turn on!! i lost my ef haynes book! do u happen to kno where the fan relay is again???

 

how about your radiator cap? it could be shot.

 

I don't think a radiator cap failure is going to prevent his fan from turning on.

 

well the car started to heat up!! it only heats up wen its in place!! but wen im driving w out a cooling fan the car does not heat up!! so its the cooling fan not coming on wen the car is stopped in place!! thats wen it starts to overheat! and the fan stays off!!

 

Sounds right.
When you are driving, the air passes through the radiator and cools the water off.
When you stop, the fan isn't working so the water can't cool off and you heat up.

Troubleshoot the fan system like I suggested a couple posts up and see what you get.

 

thanks 4dref!! im a try to short the wires n see if the realy is the problem!! is there a certain ground wire that the fan uses????

 

Don't count out the Rad cap. If your cap is bad and can't hold pressure (14-16lbs or so) then the system won't pressurize and the water/antifreeze will boil at a lower temperature. Also check the strength of your antifreeze. If it's finished it will boil over at 100C/212F degrees as if it was plain water. And your fan will likely not come on since the activation temp for the fan hasn't been reached.

 

but wouldnt it still do it while im running the car!!? ive changed the radiator cap like 3 times! it still does the same!!

 

thank you.

 

have you checked the temp switch? or even the fan relay? its on the radiator support bracket. at least thats where it is on my da.

 

yes i checked both of them i jumped the fan switch and it did not turn on! i dont know if that works but i bought a new and it still did not work. and i exchanged the relay and it still did not turn on!!!!!!!!

 

why haven't you checked the fan yet?? Postive and negative to the battery.

 

Do you have any leaks around the timing cover area? It could also be a water pump failing...

 

No. it's can't be that.

Failing water pump won't make your fan stop working.


OP - jump your fan direct to battery. Fan motor might be dead.

 

Well think about this... failing water pumps can cause hotspots. Making the water boil but not in the vicinity of the thermo switch which is on the back of the block. He said that the gauge was reading normal as well but the water was boiling. So in all reality it could in fact be the water pump. So don't close your eyes so quickly to the realm of possibilities.

 

Eyes are slammed shut to the water pump being faulty.
He also said that he shorted the fan switch wires together and the fan didn't work.

 

that was the first thing i did!! i connected the fan to the battery n it turned on!!
so next was the thermo switch! i jumped it and it did not turn on! so i replaced it with a new one, and it still did not turn on! someone had told me that when u jump the thermo switch that does not work!! ive tried everything already im just not tryin to do a ghetto job n connect the fan to be on all the time!!

 

Assuming your turned the car on with the thermoswitch wires jumped, the fan should turn on.
It does work - you can even put a switch on these two wires and make a manual fan switch. (Actually only need to wire up to one of them - the other wire goes to ground).

Anyway - you have a problem between the thermoswitch and the fan.
The only components left are the fan relay and wiring.

 

yes that exactly wat i did! the thermo switch was jumped and wen i turned the car on... the fan did not turn on!!
does the fan have anything to do with the heater boxes!!?? because i removed all of them and there is a bunch of plugs loose from the harness next to the ecu!!

 

Nope. nothing to do with anything inside the car.