Recent content by zephyr429

My 2003 TB LT 4x4 was doing this a while back. I tried changing the oil, changing the sending unit, even changing the oil pressure stepper motor. No luck. Turns out the cause of mine was the oil filter. I had switched from ACDelco to Fram for a few oil changes and realized this is when it...

Greeting everyone. So I'm looking for a little input from anyone that might have experience with this. My mother has a 2003 TB LS, 2x4, with a 2004 4.2, and when I drove it today it wouldn't start when I got back in. After a moment I realized that I had inadvertently left it in drivenwhen I...

I literally just had my AC rebuilt. My problem was my compressor was on its way out. It would blow cold occasionally. But most times it would blow hot, or start cold then hot around 20 minutes after it was turned on. After I had it replaced it worked fine but would occasionally blow hot. I found...

FYI to anyone with the same issue of dropping oil pressure at idle after checking all possible problems, try changing your oil filter. At soon as I switched to a Purolator (parts store was out of the AC Delco) I started having the issues with pressure after 2k miles. I changed the oil and went...

I just finished a 433 mile trip to the beach. I changed my oil just before I left. The false low oil pressure warning and zero pressure never popped back up. Maybe a combination of new pressure switch and new oil/filter solved it, at least I'm hoping.

So time for an update. I believe that I've corrected the over heating issue. After changing all the parts and chasing my tail it was staring me right in the face. I replace the radiator on a warranty claim, telling the it was leaking, and the over heating issue seems to have went away. Driving...

Yes it does. I'm guessing that it rules out the problem being the step motor for the gauge. It only happens when I'm overheating and only at full stop. Once I start rolling the needle goes back up and the "check gauges" light goes out. All of the trouble started when I had the AC compressor and...

@Mooseman @gmcman @MAY03LT : Was out tinkering again before I sent it to the shop. Found that at normal temp it's between 207 and 210. Once it start going up its at 220-212. And then my oil pressure drops to zero. It's not actually dropping. The truck just thinks it is. Any ideas on that?

Ok. Time for an update. Sorry for the delay I have been out of town for a few weeks house sitting for a friend. Today I had the time to remove the alternator to get to the coolant temperature sensor and changed the sensor. Put everything back together and test drove it down in interstate 20...

Its an oem cap. I use oem when ever possible. I haven't pressure tested it though.

The entire system was flushed a few days ago by a radiator shop. I thought of air also. I have two trailblazer engines in my garage right now. I'll prolly swap the sending unit out and run it down the highway.

Well back to the drawing board. My CAT is clear and free flowing. About the only part I haven't replaced is the temperature sensor above the thermostat. It just raises one question, when I temperature sensor goes out is it all or nothing? Meaning could it be sending skewed reading, or would it...

@gmcman : I only use dexcool. I noticed when I got my trailblazer several years ago that the graduation was closer together after 210. I could tow a fully loaded trailer in the dead of a Georgia summer and the needle would not budge. Two ticks the the right is abnormal for mine. If I let it go...

@Mooseman : the thought had occurred to me about the fuse and/or relay but the fan engages with no problems. Moves plenty of air. However if I am incorrect in my logic we have 2 other trailblazers that I can pull one from. My mom loves my trailblazer and I found 2 dirt cheap, an 04 with a...

I'll keep that in mind if it's not the CAT as kind of a worse case scenario. It's just strange, annoying, and expensive. I have never had a over heating issue like this. It all started after the AC repair. Well maybe before and I wasn't aware because I couldn't run the air. Lol.