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Discussion Starter #1
On the way into work this morning I looked down to see the temp light was barely above the normal mark. Kept and eye on it and a couple blocks later is started to rise quickly. Pulled over and checked the coolant to make sure I had coolant and checked the oil to make sure I had oil. Waited a bit and the temps were at normal. Pulled out and about a mile down the road the same thing happened. This time never getting more then 3/4 however.

Pulled over again to let it cool for 20min. Drove off and it began to rise again. Figured I would have it towed in to the shop so was looking to pull over. Hit a damn pothole and immediately there after the temps went back down to normal. WTH?

I was initially convinced it was thermostat but that doesn't explain normalizing after hitting a pothole. Short somewhere? Possibly just the ECT sensor having a problem?
I already checked all the fuses and fluids.
The odd part was that when I turned the heat to max to help let some heat out of the coolant system the heat would come and go.
Possibly just air in the system?
 

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Yes Air..

Burp it..

Cap
 

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Discussion Starter #4
My coolant was just above the low mark.
I burped the system and then drove around for over half and hour and it never did it again. Took side streets with stop and go driving and then even hit the highway. Didn't happen again.
 

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Sounds like air in the system. I've had air pockets develop in my cooling system randomly. A good burping procedure and I'm good to go. It seems like it happens about once a year to me.
 

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Discussion Starter #7
Will see if it gives me anymore immediate problems in the next day or so. Already got a thermostat and gasket waiting just in case. After checking it out the serp belt needs replacing. Will get under the car and look for a possible water pump issue.
 

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http://i1199.photobucket.com/albums/aa480/kbranch4/100_0511_00.jpg
http://i1199.photobucket.com/albums/aa480/kbranch4/100_0510.jpg
http://i1199.photobucket.com/albums/aa480/kbranch4/100_0511.jpg

It's the toyota manual, I bought mine off E-bay (175$ and worth every penny). There are some posts on the net from people on how to do this. If you decide to do this and have questions along the way contact me. see pics if it helps (try zooming in if you can)

Edit: http://www.spydermagazine.com/2002/Nov/coolant/coolant.htm
Try this site, I used it for reference when I changed mine.

Oh, the 2 main line drains have gaskets. Copper crush washers, I re-used mine as they were in good shape but they should be changed. Your car should have sevice hoses (clear plastic hoses) attached when you remove your frunk cover. you can use this hose when draining fluid. I bought extra hoses at the hardware store but you don't really have to.
from a previous post
 

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Bizarre. A very large air bubble managed to work its way out of the coolant system this AM - just 2 short years after changing the coolant (and just in time to replace it). This is after several attempts at bleeding/burping/cajoling/coercing the air out.

it's vacuum fills for me from now on (but I suspect that still won't be foolproof on this car).
 

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When I changed the coolant the bleed hoses up front where set in the folded position and took a bit of time to uncollapse. Nest time I will have two extra hoses not folded to keep them open. Minor but better.
 
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