Hey guys,

i have a 99 ej8 and just finished swapping in a 98 gsr.

When i first crank the car, i would say after only 5 seconds the temp starts rising quickly to normal. i can drive it, and it will rise to about half, then go down to normal on deceleration. BUT after i come back for a drive, and let it idle, it starts to go up to about 3/4. The Fans never come on.

I put a new thermo switch, new thermostat, Heat is working, both radiator hoses are hot. i even jumped the plug at the thermo switch to confirm that the fan is working.

Someone told me that there is still air in the system somewhere, in the many years ive been working on cars, ive ran into some stubborn cars with air in the system.

ive bled this damn thing many times now.

Anyone have any ideas?
please and thanks in advance

 

Are you bleeding the cooling system like this:

https://honda-tech.com/forums/showth...1#post39830585

 

havent on an incline, no

also the radiator never comes on, even if temp gauge reads 3/4

 

Try following those instructions to the tee.

This^ can be caused by a trapped air pocket in the cooling system. Rule that out first.

 

ha meant to say radiator fan..
ill do it, but do you think it could have anything to do with the temp sensor on the head? the one the gauge reads from.

Maybe i can check the resistance, may be out of spec, or have an air pocket around it?

 

Nope

You installed a new fan switch already, right? Just do another bleed and then go from there.

 

alright, sorry it took some days to get back over here..

so, today i put up on some stands in the front to try and bleed it..
after about an hour of trying to get the air out (assuming there is/was air in it) i got the radiator fan to turn on for maybe 10 seconds. After that, couldn't get it to work again, even with temperatures at 3/4. so that tells me what? that the wires and sensors were functioning. The temperature rises when i hold the rev anything higher than idle, like 3k for example, it will go up to 3/4, maybe a hair more.

i did swap the radiator fan relay with the a/c clutch relay because its working properly. Also, would the obd2b to obd2a jumper harness have anything to do with this problem? i wouldn't think so since the fan did come on momentarily.

the radiator hoses aren't building up a excessive pressure, just the normal. When i turn on the A/C only the condenser fan turns on. For some reason i thought both should come on but maybe I'm mistaken. Haven't check Mitchell for the wiring diagrams on that.

Dunno what else to do, ill try again tomorrow bleeding it. Any suggestions ill appreciate it

thanks

 

Maybe your fan switch is not the right one?

If you unplug the fan switch and short the connector with a piece of wire to make the fan run continuously, does the engine still overheat when idling? (don't let the needle get too far past halfway before letting the engine cool)