Hello Drive Accord!,
I have a 1999 Accord V6 3.0 EXL that Ive owned since new, and it just started overheating recently.
I immediately noticed the fans were not coming on. I turned the AC on, and the fans came on. I removed the connector from the fan switch, jumped it with a paperclip, and with KOEO, the fans came on.
Ive done a ton of web searching, and looked to be the fan switch, so I purchased a new OEM fan switch and an OEM thermostat, and replaced both. Still overheating, and the fans are still not coming on.
Here is a summary of the troubleshooting things I have done so far in attempt to figure this out:
Tomorrow I will be pressure testing the system after I reinstall the thermostat with a coolant pressure tester I got from the autoparts store loan a tool program.
Here are a few things I am suspect of.
It seems as soon as I start the car when cold, the temp gauge is immediately at 50%. Seems like this was only about 1/3rd before, and that was after it warmed up for a few minutes. Seems like it stayed at cold for the first few minutes prior to the problem, but I cant say for sure.
Could this be the Coolant Temp Sensor that is bad? Could that be 1) giving me a false reading of an overheated condition, and 2), could that prevent the fans from coming on? I am not seeing any boiling in the overflow tank, but the hoses are quite hot.
Thanks for the help in diagnosing this. Ive been suffering with this on-and-off for almost two weeks now.
I have a 1999 Accord V6 3.0 EXL that Ive owned since new, and it just started overheating recently.
I immediately noticed the fans were not coming on. I turned the AC on, and the fans came on. I removed the connector from the fan switch, jumped it with a paperclip, and with KOEO, the fans came on.
Ive done a ton of web searching, and looked to be the fan switch, so I purchased a new OEM fan switch and an OEM thermostat, and replaced both. Still overheating, and the fans are still not coming on.
Here is a summary of the troubleshooting things I have done so far in attempt to figure this out:
- Fans work when fan switch is jumped.
- Replaced the fan switch with a brand new Honda OEM switch., but fans still dont come on.
- Fans DO come on when AC is turned on, but dont seem to reduce the temp.
- The heater DOES blow hot air.
- Ive already replaced the thermostat with a new OEM Honda thermostat
- Ive tested the fan switch in boiling water. There is no continuity when cold, but once its in the boiling water for a few minutes, there is continuity.
- Ive tested the Thermostat, and it opens in boiling water, closes slowly when I remove it.
- I removed the radiator, and when I put a garden hose on the thermostat housing and run water through it, water comes out of the top hose port with what seems like a good flow.
- Removed the thermostat completely and looks like there is some flow when looking in through the radiator cap opening. Cant say it looks like great flow, but the water seems to be moving.
- I see no visible collapse or kinks in the two hoses.
Tomorrow I will be pressure testing the system after I reinstall the thermostat with a coolant pressure tester I got from the autoparts store loan a tool program.
Here are a few things I am suspect of.
It seems as soon as I start the car when cold, the temp gauge is immediately at 50%. Seems like this was only about 1/3rd before, and that was after it warmed up for a few minutes. Seems like it stayed at cold for the first few minutes prior to the problem, but I cant say for sure.
Could this be the Coolant Temp Sensor that is bad? Could that be 1) giving me a false reading of an overheated condition, and 2), could that prevent the fans from coming on? I am not seeing any boiling in the overflow tank, but the hoses are quite hot.
Thanks for the help in diagnosing this. Ive been suffering with this on-and-off for almost two weeks now.