I have a 98 civic ex d16y8, it mqinly overheats in stop and go traffic and when the ac is on. I replaced the thermostat, radiator, radiator fan and fan switch, bled system of air. Still fluctuating from 219 tp 225 degrees. WTH I can drive all day on freeway doing 85 and stays at 176 degrees but soon as I stop with ac on it jumps. what els could this be.

 

Change the thermostat to a colder one. Possibly you have a thermostat meant to run hot. go to a 180 degree or 160 if your in super warm climate.

 

Is your timing retarded? I believe if its too retarded you will run hot.

 

Yea I live in texas so its pretty hot. I have a mushimoto 165 degree thermostat I n supposidly lol I can check the timing. I was hoping it wouldn't be anything big like head gasket but I'm not losing any coolant and it we ould overheat all the time. I do have a new waterpump if that might help. The car just hit 183k o have no clue when it was done last

 

are you sure you don't have any leakage in your coolant system ?

 

What's normal operating temp on a civic?

 

I did a leak test and radiator had a leak so replaced that

 

You replaced the radiator before and are still having problems, correct?

175-204F is generally what I see on my EJ8 in so. Cal.

Cooling and condenser fan both operating?

Check your A/C condenser as well. if it's clogged with dirt or debris or has damaged fins, your compressor may work harder to compensate, potentially causing an overheat.

 

A lot of times the water pump find will wear out also causing poor circulation At idle and low rpm

 

If you're at a stop and the temp needle is going up try putting it in neutral and revving to 3k or 4k rpm. If the needle goes down it could mean you need a new water pump.