i have a civic si 2000 and i was draining the coolant from the radiator hoses and i went to put all the hoses back on and refill the coolant made sure everything was connected and went to start the car and it started overheating and the radiator fan wasn't kicking on.Ive tried everything to try to fix it nothing is working though. the engine was getting hot but the bottom radiator hose wasn't so i thought the thermostat might be stuck closed so i replaced that but it still didn't work. PLEASE anyone have any advice , i missed a car show cuz of this.

 

well first thing would be why were u draining the coolant form the hoses? and did u put them back on right? its kind of hard to help u out because thers no telling what u have actually done.

 

I think you may have air trapped in the system. When the engine is cool, remove the radiator cap and top off the coolant level in the radiator and reservoir. Then bleed the system.

 

well for the car show i was trying to make my engine look cleaner so i was trying to install a dress up kit for all the hoses, i figured that they might give me that extra point for judging but anyways so i had to take them off and drain them to put the kit on them and yes i made sure they were put back on correctly

 

this might be a stupid question but how do you bleed the system cuz i know that only the older Integras have a bleed of valve right?

 

Yeah, when engine is cool, remove radiator cap and top off the radiator and reservoir with coolant. Place the radiator cap back on loosely and then idle engine until the radiator fan turns on three times. Top off with coolant again, tighten radiator cap, and you are good to go.

 

exactly wat you do

 

so i tried bleeding out the system but for some reason the fan isnt kicking on and also i found out that a small tube coming out of the engine next to the thermostat is cracked and is leaking coolant so i got to get that replaced. I still dont get why the fan isn't switching on any ideas? I dont get that just by taking off the radiator hoses it caused all these problems.

 

First fix the coolant leak and then bleed the system. During the bleeding, check again whether the radiator fan fails to run when the engine is hot.

If the fan won't run, supply battery power directly to the motor. If it runs, the fan motor is obviously fine.

If the fan motor is fine, uncouple the 2P connector from the coolant temp switch on the thermostat housing, and put a jumper wire across the connector's terminals. When you turn the ignition key to ON, the fan should run continuously. If so, the temp switch is bad and and must be replaced.

 

i think the fan relay went bad so i got that ordered and its coming in wednesday ill let you guys know if that fixes it thanks for all the advice!

 

So i checked the radiator fan motor and its fine and i checked the fuse and replaced the fan relay and the engine coolant temp sensor and they all are good and i replace any leaking hoses and made sure nothing was disconnected or loose and made sure there was enough coolant in the reservoir and i topped off the coolant in the radiator ive pretty much tried everything to fix this overheating problem and nothing seems to work any other ideas to try and fix this PLEASE ! im running out of ideas

 

Is the radiator fan still not running when the engine is hot? If so, check for a broken/damaged wire or connector in the circuit.

 

hey I dont know what i did but suddenly tonight it just started working without changing anything lol so it fixed itself thanks for all your help!

 

If it happens again, check for a loose connection in the circuit.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RonJ@HT &raquo;</TD></TR><TR><TD CLASS="quote">If it happens again, check for a loose connection in the circuit.</TD></TR></TABLE>

Or a wet connection.

He said he washed it out, double check to make sure the plug doesn't get wet next time, if there's a drop of non-distilled (tap) water in between the two nodes (power and ground) it'll complete the circuit without ever reaching the fan motor.

 

When you are filling your coolant system do it with the car running fill it up completely leave the cap off and let the car run and warm up to operating temp. this will allow the thermostat to open. Which in turn will get rid of all the air bubbles out of your coolant system. You will have to keep refilling the radiator cause the water level will drop as air bubbles escape.The air bubbles might be causing your engine to overheat! One thing to be cautious of is that when the motor is at running temp and all the air bubbles are out put the cap back on before you turn the motor off because I've seen boiling hot coolant shoot out about 6 feet in the air when a friend of mine shut his car off with no radiator cap!

 

just fill up the radiator, leave the cap open, start the car and turn the heater on(vent mode not recirculation), wait for the fan to kick on,, then top off the coolant and cap the radiator

 

helps to park on a bit of an incline with the front of the car going up as well.