Oil pressure 'guage' going up and down while driving

Asked by Apr 19, 2012 at 07:52 PM about the 2005 Chevrolet TrailBlazer LT

Question type: Maintenance & Repair

I have a '05 Trailblazer with 175K miles on it and today while driving home the warning light came on to ck. the guages.  Looked over and noticed the Oil guage went from the average of 40 down to 0 and remained there for a couple of minutes.  Then it shot back up to 40 again and the warning light went back off.  It did this, that I noticed, about 5 times in a matter of just a couple of minutes.  Not sure if it means anything but the AC fan just an hour before this had stopped blowing almost completely.  Still blew cold but was blowing like  it was turned to '0' when it was turned to '5'.  Might just be a coinsidence but not sure....Any help would be greatly appreciated.  

1 Answer

305

ac fan not likely related. possible faulty blower motor or blower resistor assembly failure there. Dropping to 0 and back up is likely either an intermittent wiring problem in the oil sending unit or the sending unit itself. not likely to be engine related unless you hear bearing noises or have metal in your engine oil. also once oil pressure goes low mechanically it usually never comes back to normal.

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