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Chevy Blazer GMC Jimmy Maintenance and Repair



  • Coolant should NOT drop more than what, 1/8" or so it at all over a month or so as the cycling of the coolamt in and out of the reservior to the radiator has a minimal evaporation. So, gurgling was a clogged heater core - sure they really change it the first time cause its pull the whole dash out and $600 job - maybe they lied - did I say that - and flushed it to get it going and save money. The core is just a small radiator that the blower blows air thru to heat the air. See the 2 heater hose on the firewall underhood - 1 in, 1 out. Insist they clean or wipe down the heater box that houses the core cause that Dex cool is sticky and will smell for months and if you got that puff of steam in the vents at anytime due to this the ducts may smell for awhile too. Make sure the repairs are documented in writing.
  • Thank you, repairdog, for your kind comments.
  • Where is the fuel fiter and pcv valve located. I am having trouble starting the car. It usually starts on second crank or more, but never first. Not sure if it is fuel pump, but want to start by elimination.

  • Fuel filter is under the inside of the frame rail about under the drivers seat. One end is quick release other takes 2 wrenches. You will need to remove the 1 bolt holding the bracket on usually to get the filter out and the 3 lines on top of teh bracket just snap out (hard) and you will get gas on you. Then, tuneup is next with a cap/rotor, plugs, and wires if original. Have to use a fuel pressure tester to see if pump and I've posted the info on that many times.
  • Got the bolt off, got the quick release, is there a trick to the 2 that need wrenches? Is it a typical counterclockwise to loosen or opposite?



    BTW, where is the fuel pressure tester valve?
  • I think I got the right sizes, 5/8 on the smaller size and 13/16 on the other.
  • Make sure you do not destroy the small nut on the line side - that one slides on the pipe and comes on it. If it won't turn spray some rust remover for a few days on it and go buy a brake line or tubing wrench that has a third side on it to grab the nut. Under the hood at the rear side of the engine see the 2 metal fuel lines and in the middle of one is a cap and a schreader valve - Actron has a tester runs under $40 at most stores.
  • Blower works properly but no hot air. I changed the thermostat and still no hot air. Any and all suggestions appreciated. Winter is coming on and I will need heat.

  • See post #2493 on flushing the heater core. In fact, if you have never done it the entire cooling suystem needs to be flushed and Dex cool replaced and a new Stant cap 16 lb.
    Only other possible is the heater door is not moving - do you have Climate Control (actual temps on controls) - that could be an electric blend door - first is the heater core and system flush - Dex cool every 3 years - 5/100 GM ad is BS and if the system gets ant air in it that Dex turns to sludge. Reservior should be to Hot full when cold.
  • Where are the o2 located on a 96 jimmy? Thanks!
  • In exhaust pipes underneath the Blazer. Bank 1 is drivers side with 1, and bank 2 pass side with 1 in front and 1 in back of the cat. Unless you pull the code I would not change them - up to you but $55 each and they say they help mileage but only if bad usually.
  • I have a problem with my 4x4
    the 4x4 stopped working instantly it is completely dead, no more lights for 4x4(2hi,4hi,4lo) everything is dead, I have checked the 20 amp fuse for the 4x4 and it is good. Any idea what the problem can be? or if you can guide me to previous post, I have checked all the post for an hour and I can't find anything similar.
    Thank you
  • All mine are 98up and there is a "4wd" fuse inside mine by drivers door #15 and another underhood called "ATC" for the transfer case. Look at those then you may have to pull the switch and probe for voltage there to see if it failed. Then theres the TCCM or computer for the system mine is in pass side kick panel (96 maybe behind there or center of console behind ashtray. Best I can do on this - sure sounds like a fuse or switch. Has your dash been taken out cause they have to disconnect the switch when they pull that for the heater core.
  • I have had my 1998 Jimmy for 5 weeks. I have been having some severe problems for the last week with getting it to move from a stopped position. At times it takes off normally but at other times it feels like you're pushing your foot on a cinderblock instead of a gas pedal. When this happens the engine "revs" but the wheels don't move at all. It doesn't do it all of the time, just 50% so far. I thought it was the transmission, but today has made me think otherwise. Since the day after I bought it I have had problems with it dying when I slow down or stop but only when it has around a quarter of a tank of gas in it. After driving it today I had it running in park for a minute while I closed the gate at the end of our driveway. While in park and no feet on any pedals the engine suddenly revved as hard as it could and the needle in my rpm's gauge shot up to 6 (which is in the red/orange). It stayed like this for a few seconds then went to normal and then the engine just died. But after it died I started it right back up again with no problem. Any ideas?
  • Have you read the SES codes out - must be one. Autozone and Advance/Discount read for free. Sounds like a throttle position sensor (TPS) with the surging but could be a PCM (computer) problem. Fuel pressure should be checked after that. Plugged cat usually makes them bog. Most other sensors will cause no run or rough running but not surging. Also if around 100k miles does it have a new Delco (don't buy cheapo one) cap and rotor, plugs, and wires? If no code I suggest a dealer visit - $80 or so for an hour to analyze and saves you from throwing parts at it.
  • Thanks, Anyone knows where to find the tccm on a Blazer 96,
    I checked under the passenger side kick panel but it is not there. Is there a fuse on the tccm?
    Thanks AJ
  • Thank you for answering, after reading your reply this morning I called and made an appointment for tomorrow to have it put on the computer at a local garage to read the SES codes. My service engine light soon has been on since a few days after I got it so I had the codes done once but the woman working at Autozone was so vague about the two it came up with (she was new at the time and had no idea what the codes meant). As far as I know there hasn't been a change in the Delco cap or plugs and wires yet but I will have them check them tomorrow. In the 5 weeks that I've owned it I have had to replace both front wheel bearings, two tires, a new radiator cap (the coolant reserve cap is next, it was missing when I bought it), and I had to have the ABS unhooked because the pump went bad and caused me to have no breaks. I also had to have it to the shop because the previous owner only put 1 and 1/2 quarts of oil in it so the oil pressure kept dropping on me...thankfully it was only in need of a new oil change and nothing worse...I hope. I will let you know how it goes, wish me luck, I'm probably going to need it :(
  • I had the Jimmy put on the computer today and they told me that the O2 sensor in Bank #1 is bad and the 3-2 shift solenoid in the transmission is bad. It's a little expensive but not as bad as if I had to have a whole new transmission. Thank you for all your help, it's very much appreciated :).
  • I'm glad to help-I have 4 Blazers and kids so see many problems. Often hard to determine the cause without a scan tool that runs a min of $400 so the dealer is a good option today - many smaller shops do not have the experience to quickly find Blazer problems. Its still cheaper than a new vehicle! The solenoid also gives you a trans filter and 3 qts of new fluid so thats good.
  • That's good to hear about the filter and the fluid, after all of the money I have sunk into the car I'm about to lose my mind :blush: I have ordered the solenoid and picked up the O2 sensor and it goes to the shop on Friday. Hopefully this will fix it and I will be able to relax a little bit. Thanks again!! :)
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