Posted: Apr 29 2008 at 10:47pm | IP Logged
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I have an overheating issue and I have read some of the issues posted here. A lot has been done, and still no solution, so allow me to start from the beginning.
I was driving home from a long hour drive and didn't realize it until I pulled into my neighborhood, that the engine was running hot. I got out and saw it steaming from the radiator cap and could hear the coolant boiling. There was radiator fluid sprayed all over the place and I think that the garage I just took it to that day forgot to put the radiator cap on all the way when they were doing thier "free" diagnostic tests. The next day, I flushed the system several times and the fluid was rusty. I put new coolant in and the truck overheated again. It has about 105k miles, so I went ahead and replaced the waterpump, thermostat, all hoses and clamps, and on a side note, the timing belt, and all drivebelts. I cleaned the radiator and changed the oil. When I got it running again, I had the truck pressure tested and everything looked good. No leaks or anything. I ran the truck for about 20 minutes and it started to overheat again. I replaced the fan clutch and it still overheats. This time, it overheats after I have been driving for close to 30 minutes. I got on the interstate and once cruising on that at 65-70 mph for a sustained period of time (15 minutes) it starts to overheat. If I just run around town, it has no problems. When I was on the interstate and it started to overheat, I pulled over and checked some things. There was no steam, odor, or noticeable overheating signs. The upper hose was hot, but the lower one was only warm. I would wait about 3-5 minutes and start the truck again, and the gage read normal operating temperature and I could make it about 10 more minutes before it would tell me the truck was overheating again.
Could this be a problem with my gage or a sensor somewhere? Waiting 5 minutes shouldn't allow the truck to cool that much.
I ran to Autozone and got the codes........just the knock sensor code. That has been there for about 2 years now. I'm stuck and really don't want to have to take it in.
__________________ 2000 Frontier
3.3L V6 Desert Runner (2WD)
Manual 105k
Keller, TX
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