1st timer

i just changed the thermostat 2 weeks ago because my car was overheating and this morning it started overheating again. While in park the temp gauge was up and as soon as gave it some gas the temp dropped. What could it this time?

desired_speeds

waterpump.

eleventure

+1.
how much miles do you have? are you on the original pump/belts?

acutee

Or radiator fan not running, could be radiator temp sensor.

1st timer

would the temp drop when i rev? Car has 133k km

acutee

revving up wont drop the temperature unless it is the problem with the water pump. Revving will cause temp to go up.

totaledTL

Air in system, perform correct bleed procedure.

1st timer

and how do you do that?

juanclopez2786

iTrader: (3)

did you bleed the system when you added the coolant after replacing the thermostat? if not try that first, just take the radiator cap off and run the car till all the air comes out of the system. they have coolant funnels that fit right on the radiator that make it easier. when i bleed the system i let the car run til the fans kick on twice and then thats when i put the radiator cap back on.

1st timer

But why would the temp go down when i press on the gas ?

MurdaZ

iTrader: (1)

so when u revved it up it cooled down? the only thing i can think of is that the fan turned on when u revved up....revving will only increase the temp like acutee stated. try what juan said. mainly because it happened to me be4, i didnt have enuff fluid inside, air got in, and kept overheating after 10 min of driving, let it bled and was fine again. if it still does it i would check ur water pump and the tstat again. if anything to test the tstat, put it in boiling water, drop it in the cold pot, then crank the heat, and look for it opening...u would need specs, and a heat gun, but if it opens up u can rule that out.

1st timer

I'm ruling out t stat cause i changed it. Sometimes it won't overheat at all and then all of a sudden ,it overheats.When i rev the engine,i'm assuming the temp drops because the water pump is pumping more coolant????
I'm changing my timing belt and water pump soon along with the tensioner,what else should i change since i'm doing all this?.How can i check if the switch is in working order?

juanclopez2786

iTrader: (3)

bleed the cooling system before you do anything else. if you didnt do it right the first time you wont do it right the second time after u change the water pump.

totaledTL

It's in the owner's manual. Look under "coolant, replacing" in the index.

murky

As far as I can tell the instructions in the owner's manual for what to do after refilling coolant involve running the car with the radiator cap on and periodically instruct you to top up.

Is this the same process I'm supposed to follow if I have added some coolant and/or want to bleed air (not after a drain and fill).

In my case my reservoir is already at max and my radiator full. I want to bleed the system but running my engine with the cap on doesn't drop the level.

If I remove the cap and run the car the level in the radiator rises and then overflows.

1st timer

This is getting annoying.Today as i'm driving the temp was normal after a while as i came to a full stop the temp dropped all the way down and as i accelerated it went up till half way maybe a bit more and when i stopped again it went all the way down...WTF!!!

spiro

Seems like a malfunctioning temp gauge!!

juanclopez2786

iTrader: (3)

sounds to me like you might need to have the cooling system pressure tested making sure theres no air getting into the system. bring it somewhere so they can vacuum the cooling system till all the hoses are flat and then fill it knowing theres no air in the system. if that fails you should look at having a cylinder leakdown test to make sure your head gasket isnt blown.

1st timer

If it was the head gasket i would've had white smoke come out of the exhaust.
Could it be a malfunctioning temp sensor?

totaledTL

Sure sounds like air pockets are in the system. Would explain the fluctuating gauge.

1st timer

what is the best way to remove the air pockets?

spiro

Turn the ignition switch on (II). Set the displayed temperature on the climate control system to 90°F (32°C) , then turn off the ignition switch. Make sure the engine and radiator are cool to the touch.
Remove the radiator cap.

Install the radiator cap loosely.
Start the engine and let it run until it warms up (the radiator fan comes on at least twice).
Turn off the engine. Check the level in the radiator, and add Honda All Season Antifreeze/Coolant Type 2 if needed.
Put the radiator cap on tightly, then run the engine again and check for leaks.

MurdaZ

iTrader: (1)

put a damp cloth/towel over the rad cap, easier to touch

totaledTL

Post #14.... did you read the manual & do that?

1st timer

I did this but without putting the cap on loosely and coolant was constantly coming out and don't ask why i did this but i squeezed the rad hose the rad overflowed a bit i turned of the engine and put back the cap.

1st timer

Once again i loosened the cap and let the car run for a good 10 mins,temp gauge was reading normal temp but the fan did go on.Went for spiritted ride and the temp remained at normal.

1st timer

I was driving the car today and the temp was fine and then all of a sudden,the temp gauge dropped all the way down and got a code 006. After about 5 mins,the temp went back up to normal.What could this be?

juanclopez2786

iTrader: (3)

seems like a bad temp sensor since the temp dropped.

1st timer

After my drive back from work i checked to see if the fan was working. With the a/c on,they both work but when i turn off the a/c,the driver side fan does not go on.I drove with my car for 15 mins and when i came home i waited for another 5 mins but the fan never came on.I guess the fan switch needs to be replaced. Is it under the rad on the 00 TL?

1st timer

Just an update...The "occasional" overheating was caused by temp sensor,witch also caused erratic rpms.

1st timer

the sensor i'm talking about is located where the radiator hose ends.Follow the rad hose and you'll see it. It's number 15 on the diagram.

deepconcentratn

Hey way to go,

It seems that 2nd Generation TL's have that problem. I recently had to replace and now everything is all good.
Have you replaced that blower motor and sub-harness yet?

1st timer

nope.

zenally

Very good information here! This site prevents us females from getting ripped off a lot.

Thanks
Zenally