Quote Originally Posted by JayAz View Post
I had a similar issue last summer with my 2000 GT. It was slowly leaking coolant over time (my low coolant sensor doesnt work right).
Engine temp just jumped up to max while on the freeway.
I managed to add coolant, and it seemed 'ok' for another month.

There is a plastic 90 degree elbow (newer models have 2 plastic elbows) on that was cracked and deteriorated. It is located on the drive belt tensioner, which is under the alternator.
Get these elbow(s) replaced, part cost is about $11 each from the dealer. It is called a upper and lower thermostat bypass pipe assembly (same part # for both). 1 hour DIY project.

The overheating though, warped my UIM Plenum (I have a N/A, VIN K).
Eventually (month later), coolant leaked into my engine. $1180 went to my local shop to have it fixed.
I think this is the problem I have... My upper/lower thermostat bypass pipe assembly ruptured over the weekend, thankfully right when I pulled into my driveway. I'm looking at it again tomorrow, but from what I could see tonight, it really only looks like I could replace it by pulling off the belts, tensioner, etc. (Not a 1 hour DIY project - least of ways for me). The tube is hard plastic, so it doesn't look like it could fit without pulling out some of the components off of the belts.

Is there a step-by-step someone knows of or an easier way to do it than pulling all of this off?

Much appreciated! I need to get it fixed ASAP.