Once again, I'm having trouble with the in-laws '98 accord 3.0 v6 j30a1.

Since the engine swap it has been running flawlessly. Now I am having issues with the engine cooling fan not running, causing it to over heat. When the car is run with the A/C on, both fans cycle and keep the temps in check. So for about the last 2 weeks that's what they've been doing to drive the car.

Which of the coolant sensors feed the fan signal on this engine. There seems to be 4-5 coolant temp sensors. I could be mis-identifying them, but I don't want to just throw parts at the car.. Anyone have any input as to where to start??

 

Here is a quick test to point you in the right direction

1. Locate the cooling fan temperature switch on the thermostat housing behind the distributor on the lower radiator hose. The wire colors at the switch are Green and Black. First with the engine running, unplug the switch and jump the connector, and the fans should run. If the fans do not run, check the Black wire for a good ground.

2. If the Black wire has a good ground and the fans do not operate, then check for an open Green wire between the switch and the fan relays.

3. If the fans do run when the switch is jumped, then verify that there is good coolant flow to the switch. The switch needs to get to 199 degrees F to close and run the cooling fans. If there is not hot enough coolant at the switch, check for a stuck thermostat or a restricted radiator. If the temperature is at or over 199 degrees F and the switch does not close and turn on the fans, then replace the coolant temperature switch.

Hope this helps

 

Thank you!! Thats the kind of answer I was lookin for! I'll get on it, and will post results.

 

Anothe question while we are here... What is the best procedure to bleed the J30a1 cooling system?

 

Bump up to the top Amy hints on the cooling system bleed??