Mysterious coolant disappearance. Help!

[Bills86e]

All of your problems are a result of not knowing how to bleed the air out. The bleed screw is near the fill cap. A bleed proceedure
of 8 times, bleed air out, fill, warm up engine, let it cool, re-pete.
YEAH.........8 times! All it takes is just a small air bubble and the
thermostate WILL NOT OPEN, or work right. Overheat & failure is
the result. As far as the "fan" goes, IF you have the air out, the
hot water will operate the LS switch, if not, the low speed that is
supposed to be activating the low speed of the dual speed fan
fails because it is in air. You have to get every air bubble OUT!
When the A/C dash switch is depressed, that turns on the High
speed fan motor, but THAT will fail if the sensor/switch is in an
air bubble. Overheat results. It will take you about 8 times of the bleed proceedure to get the air out. ALSO, the heat cycle must
be in the ON position, as the heater coils will hold air and you
will airlock the system and not ever get it bled! Hope you read
this advice and understand this. From undernieth the front on
driver side you can unplug the fan and three wires inside are:
Brown-ground, Black/green-low speed, Black/grey-high speed.
I add this info so you can test both electric speeds of the fan.

This may not be the answer you want, but its the answer you need.

[fly2thesun]

Although this is a 2-year-old thread revived, I'd like to add a little to agree with you, Bills86e.

It was indeed due to improper bleeding by the stupid mechanic. They didn't bleed properly, which led to occasional overheating. It was not bad enough to kill the engine, but enough to cause a leak in the radiator. Without realizing why the radiator cracked, I had the radiator replaced at the same mechanic.. and found the next day that the coolant level is lower again, without any trace of leakage. At this point I was 100% sure that it was a bleeding problem. So I did the bleeding myself (it was really easy), and then everything was fine.

It's a shame that there are mechanics around who can't (or don't?) do such a simple and obvious thing to do.

[tiFreak]

Originally Posted by fly2thesun

It's a shame that there are mechanics around who can't (or don't?) do such a simple and obvious thing to do.

the ti is much harder to bleed than an average car, the reservoir tank is not the highest point in the system as it should be, which is why you have to let the car run so many times to bleed it

[drrty byl]

Yep, bleeding is the key. That, and making sure there are no leaks and that the plastic coolant connector on the back of the engine isn't cracked.