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Discussion Starter · #1 ·
hey after driving for an hour, i parked it for half an hour. Then after I started driving again all of a sudden the temp. gauge kept going up.

i pulled over and let it cool down. I opened the cap, and the coolant was boiling and spilling. Now when I drive on the highway, the temp. gauge goes down and when I have to slow down in traffic or a light, the temp. keeps going up.

It never hit the red zone, but its near there.
Anyone know what this could be? when I turned on the car, i saw the fan go on. I dont think I noticed any leaks, but there is pressure and coolant in the cap.

Goes up high when stopped and goes back to normal on the highway.
This never happened before, any one know?

thanks
 

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Is your radiator full?
Is your radiator overflow can to the full line?
Check the radiator cap first (simple/cheap),
then the thermostat next (not quite as simple/cheap)
If your car still has the plastic cover under the motor, you may not notice any leaks.
Check for leaking when the motor is running, but not scalding hot.
Look around the radiator bottom, top, sides,
Look at the hoses, esp around where they connect to the rad and engine,
Look on the passenger side of the engine about in the middle, that's where the water pump is. If it's leaking, it is expensive and a pain in the ass to change. I do my own work. I paid to get this done. If it's the pump, pay to change the belts and timing belt if it's close to time, or if you don't know if it's been changed.
Just went through all that over the last couple months.
You may think it is possibly the fan control module, I did, $40 and you have to drain the radiator to replace it.
Hope it helps...
ABOVE ALL, When it's hot (above half the gauge) check the water/antifreeze (when cold) and keep it full. Hell, I limped mine along with a leaking waterpump for two months. Just keep it full.
 

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Discussion Starter · #4 ·
hey guess wat, now everything seems to be back to normal. I drove around in traffic and on highway, even kept the car on for 15 mins.

Now the temp. gauge is back to normal.

Now i dont know what to do, didnt notice any leaks or anything.
 

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Be sure and check the fluid levels, if you are low, the airspeed on the freeway will assist in cooling quite a bit, then when your in town, the temp will rise.
 

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Discussion Starter · #6 ·
i checked all the fluids, the coolant reservoir was full.

When i kept the car running, i saw the fan kept going on and off and the coolant was flowing into and out of the reservoir.

I think this happened or is related to when I floored the car. After flooring, my gf thought she heard something. I didint and we smelled a burning odor.

maybe 5 to 10 mins later the temp. went up.

now, everything is fine !

i dont know why but i think its the fan control module, i dont remember noticing if the fan was going on or not
 

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was the burning like electrical smell, or antifreeze smell?
If electrical, and the fan doesn't come on, it prob is the fan control unit. It's easy to replace, just have to deal with the drain.
 

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Jiggy89LS said:
i checked all the fluids, the coolant reservoir was full.

When i kept the car running, i saw the fan kept going on and off and the coolant was flowing into and out of the reservoir.

<snip>

My only experience with coolant reservoirs filling up and draining that quickly was with a diesel Rabbit.

The cylinder wall developed a hole in it (casting flaw).
 

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are you sure you didn't blow your head gasket? Look for white smoke when you start it, and look for water/coolent on your
oil dipstick. Otherwise, your symtoms sound like it may just have been a stuck thermostat (i.e., temp going up, then down). You should probably change this just to be sure. I don't know how easy it is to fix on a c series, but I've done it on both a b and a d series, and it's very simple.

I just had to have my radiator on my CRX replaced this week, since it developed a crack, and started over heating really bad. Not cheap, but I was out of town, and without my tools, so I had to have someone replace it for me.

(as a side note, my buddie's mkii supra had a head gasket light on the dash because they're so prone to blowing.)
 

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Discussion Starter · #10 ·
today i got it checked by my mechanic, he used a little scanner which checked the temp. near the engine bay

he concluded that most likely my temp. gauge sensor has gone bad because the temp. near the engine was around 220.

he said he will look into the matter whenever i bring it to him for a day, but that could be the culprit since the fans are working and there no leaks.

funny thing is that when i drove home the temp. gauge was normal again, it seems as if during the day the temp. gauge goes up and down, while at night it stays normal.

question, do the fans go on even after the car has been turning off?
it was running on when i went to the pharmacy and when I put the key in the ignition, the fans turned off.

any ideas?

thanks for everyones help by the way
 

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I would look into changing the temp sensor myself. any manual will give you directions it is not to hard from what I have heard. 30 dollars at your auto part store. Ten minutes to plug it in.
 
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