luispequeno

i have a 00 civic si with a jdm b16a that is overheating!

i have replaced the water pump, radiator (3 core), fan switch, thermostat and is still overheating. when the temperature rises the fan does not activate. and when i jump it at the fan switch it cools down but still past running temperature.

only thing i can figure is the coolant is getting stuck at the heater core but i disconnect the line and it seems like its full, not clogged.

also when i turn the heater on it doesnt blow hot air. but the valve in the firewall is messed up. its no longer bolted on the firewall and just hanging.

someone please help me troubleshoot this car!!

thanks!

Fnix

iTrader: (1)

does the temperature fluctuate or stay hot?

luispequeno

i dont want to overheat the head and warp it. what would be the difference? should i bypass the heater core?

seth13

i would check the valve. If you're not getting hot air when the heat is on it has to be related to the heater core and supporting parts, or maybe you got a faulty thermostat?... just a few thoughts.

luispequeno

when i installed the radiator i lifted the front end of the car to eliminate air pockets and filled it up.... took it for a spin and realize its still getting hot.

so i then disconnected each hose to see if there was coolant or if i could find where my system might be stopped up.... all hoses have fluid in them so i'm sure the thermostat is opening....


my biggest worry is why is my fan switch NOT activating my fan unless i bypass it? which rises a question about my ECT Sensor that i've replaced before....

and why does it continue to get hot if the fan is kicked on!?!?

Yoitshector

Try replacing the ect sensor

luispequeno

i wanna troubleshoot it, not sit around and guess

Ryan Lwin

You said you lifted the car and filled up the radiator. But did you properly burp the system? Did you follow the direction exactly? You don't just pour coolant into radiator with lifted car. That defeats the purpose.

luispequeno

no, i did not.

how do i burp the system?

Ryan Lwin

1. Lift the front of the car up to be higher than the back.
2. Open the radiator cap
3. Start the engine and put the heater on MAX with fan on full blast
4. Fill up the radiator everytime it goes down (the coolant will go down as car get hotter)
5. Keep filling until the fan comes on (When the fan comes on, it'll drain really fast. It's important that you don't let the coolant go lower at that moment. So be extra careful when the bottom hose gets hot)
6. After fan turns off and coolant is top off, close the radiator cap.
7. Press and hold the RPM at 3000 for about 10 seconds.
8. Open the reservoir tank and fill up to the MAX position only.

Done.

luispequeno

i usually do something similar to these steps but my fan wont kick on.... i just noticed i have one of the heater core hoses to the head and the other one to the intake manifold.... which is wrong.

i'm momentarily going to correct it and HOPE it fixes my problem!!

thanks for all the responses H-T! I WILL GET BACK SHORTLY

Ryan Lwin

No. You have to do this until fan kicks on. No matter how long you have to wait. If you wait too long and fan doesn't turn on and your car starts to overheat, then it's your fan and its connections such as relay and thermostat are bad.

Also after you take the hoses out and drain the coolant, you always have to do these steps to fill the coolant. It's obvious that you are just pouring coolant in and then thinks all ok. No. You have to wait for the fan to come on when you fill the coolant after you drain.

luispequeno

i've done 3 engines on this same car... i'm aware of the process....

my heater core lines werent in the proper place and i suppose no hot fluid was running into the thermostat to activate it!

FANS ARE NOW WORKING!!!

THANK YOU HT!!

Ryan Lwin

Well, since you have done 3 engines on this car, I supposed you wouldn't mess up such basis like coolant hoses which are essential to the engine cooling system......