Question about 2005 Chevrolet Trailblazer Ext

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What should the pressure gauge reading be when the a.c. is fully charged on a 2005 Chevy trailblazer?

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High pressure circuit about 200 lbs but it can vary depending on make of AC machinery ,i have had them as low as 120lbs and they still work ok .biggest problem is not always the compressor but the expansion valve itself ,if its not working right then no pressure and 90 % of the time is the expansion valve and not the compressor

Posted on Nov 13, 2010

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I have a2005 chevy trailblazer 5.3...no oil pressure at a idle...50 lbs when I step on the gas.changed the oil pump same thing


Have you checked the pressure with a mechanical gauge to make sure the gauge on the dash is correct ?
And did you check the rod and main bearings for excessive wear when you replaced the pump ?

Mar 25, 2016 | 2005 Chevrolet Chevrolet TrailBlazer EXT...

2 Answers

MY OIL PRESSURE GAUGE GOES UP WHEN I DRIVE BUT WHEN I STOP IT GOES BACK TO 40 IS THIS SAFE? I JUST GOT A OIL AND FILTERED CHANGE.


At idle, the gauge usually reads about 40, when engine revs up, the gauge will go up to about 50 or 60. This totally normal and you should know that the reading on the gauge is just made up by the computer because the engine does not have an actual oil pressure sensor.

Sep 03, 2011 | 2005 Chevrolet TrailBlazer

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I have a 2005 trailblazer. The oil pressure gauge is ffine running around 40-50. When I come to a stop it drops to zero (under 1000rpms) I change the oil last night and it stilldoes this


The correct way of checking this is to put a mechanical test gauge on the engine and check the actual oil pressure. (your gauge is electro mechanical and it could have a "dead spot" in it.) However, if you don't have a test gauge, buying one or having a shop test it will cost you far more than the actual sending unit would. Therefore, providing that the engine isn't knocking or tapping while the gauge reads "0" ( which would indicate that the pressure was indeed low) I'd suggest that you replace the sending unit and see if it corrects the problem. The unit generally costs around $25.

Jun 23, 2011 | 2005 Chevrolet TrailBlazer

2 Answers

Fuel gauge and oil pressure gauge dont work on my 2005 chevy tailblazer


Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Trailblazer instrument cluster repair

Sep 02, 2010 | 2005 Chevrolet TrailBlazer

2 Answers

2005 Trailblazer Ext: how doi fix a gas gauge on my chevy trailblazer 20...


Common problem on the 03-06 Trailblazer instrument clusters for the fuel gauge to go out. It's usually caused by one of two main problems, either the stepper motor on the cluster's circuit board is going out or the sending unit on the fuel pump is going out. Check out this blog post about the problem - Trailblazer fuel gauge problems

May 16, 2010 | 2005 Chevrolet Trailblazer Ext

2 Answers

Oil pressure at 0 on 2005 trailblazer


It sure sounds like the oil sending unit is at fault,now sometimes,not always,the oil sending unit will seep oil or leak oil if they go bad,but like I said,not always,change the unit,and the oil and filter just for precaution.

Apr 21, 2010 | 2005 Chevrolet TrailBlazer

2 Answers

The oil gage on my 2005 chevy trailbaizer is starting to act up sometimes by reading zero. The truck has 87000 miles is this something that can be fixed? I checked the dipstick and I have plenty of oil??


Most likely the oil pressure sending unit is going bad or has a loose connection,but it would be safe to have a manual oil pressure test done to be sure it's not a problem with the oil pump.

Jun 22, 2009 | 2005 Chevrolet TrailBlazer

3 Answers

Chevy cavalier 2005 speedometer stuck not working


Google used speed cluster. Buy one and have it installed. I found one for $112 shipped and installed for $30 bucks. Sorry if I posted twice. Good Luck.

Mike 611

Jun 28, 2008 | 2005 Chevrolet Cavalier

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