I just had to have the engine (4 cylinder) in my '99 Accord replaced. There is a very long store behind the replacement but suffice it to say that it now has a 2000 Accord engine.

Original Engine: F23A1
New Engine: F23A4

Problem: Coolant temp gauge does not work due to the fact that the new engine uses 1 sensor instead of 2.

Is there any way to get the gauge to work?

 

Take the plug out of the cylinder head and put the gauge temp sender from your old engine in.

 

Roader nailed it, just swap over the one from your old engine.

 

Thanks. Questions:

1. Do I need to drain any coolant before removing the plug?
2. Would this not being connected affect how the engine runs or is this function controlled by the other sensor that connects back to the ECT/PCM?
3. I know there is another unit that controls the fans, but does this unit also have control over the fans? The reason I ask is because the fans seem to only come on whe I turn on the air conditioner.

 

1. You'll lose some coolant. Best to replace it when the engine is stone cold. The sender is high up on the cylinder head so draining the radiator will reduce coolant loss to a minimum.
2. It's just for the gauge. Another sensor, the ECT, tells the computer how hot the engine is.
3. Nothing to do with your fans either. You don't list your location, but @ 70°F the fans rarely turn on unless the car's been idling for 20 minutes to a half an hour.

 

Thanks.

Fans: I drove it for about an hour on a fairly hilly road. The outside temp as below 70 degrees and I when I stopped I would have expected that the fans would have been running. Is this true?

Also, I have a code scanner that will show me realtime data, how hot should the coolant get?

 

I doubt fans ever turn on when driving >20mph with the A/C off. If you would have let the engine idle I'm guessing that the fans would have come on within ten minutes or so after that drive, if they're working correctly.

I've never used a code scanner.

 

Honda likes to have there coolant temp maintained right around 200 degrees. fans should come on around 203 +/-

 

Thanks. I will just let it idle for a while and see what happens.

 

Just me but didn't the ECT drive the temp gauge on the 6th gen's?

EDIT- and then the PCM drives it on the '00 and up.