I'm writing to you because I need your help. As my sig says I have a 1990 Q45 with 251,000+ miles on the original engine. This summer, the following was done: new thermostat, radiator hoses, the under plenum hoses that were cracking were replaced, O2 sensors replaced, cooling system flushed and refilled with 70% water, 30% antifreeze, bg44k used, plenum removal and cleaning of throttle body etc.
Here's my problem. So in Lawrence last week it got up to as high as 109 degrees outside. I already posted an overheating problem that is now a little buried but anyway:
Last Monday I was driving my brother home from Wal-Mart when my temp gauge started rising. By the time we got near his dorm (1 minute later), it was a high as it could go. I immediately shut the car off and left it parked. Later that night I picked it up, drove it home and it had no overheating issues. The only peculiar thing was that when I parked the car at my apartment, when I shifted in park the rpm's shot up to 2100 and would not come down. I shut the car off and vowed not to drive it until the temperature cooled down.
Today it is 68 degrees outside, I went to go do laundry and on my way back to my apartment, it started to overheat again. Amazingly, this was as I was in the parking lot so I parked it. First problem was the rpm's shot up to 2500 and started fluctuating between 1700 and 2500 and would not stop. I turned off the car and popped open the hood to see the engine smoking a little. I have not gone back out to check oil and antifreeze because it is still too hot.
So the question is, what do you guys think is wrong? I'm thinking this may spell the end for my car but we shall see.
Please help
Nick
