Question about 2004 Chevrolet TrailBlazer

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2004 trailblazer changed alternator and when i turned on heat it started losing power lights flicker and now it seems to be running hot after a couple of mins of running and no service engine light or coolant light is on what could this be please help

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  • Chevrolet Master
  • 450 Answers

I'll try, sure its the right alternator? belt on tight ? did you do something different , are all connections correct, tight, not connected ? when you changed the alt, did you remove the ground cable from the battery first ? may have shorted something out. check your belt tension, maybe thats it. try all this first, you might need prfessional help

Posted on Jan 13, 2013

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Posted on Jan 02, 2017

  • 2920 Answers

SOURCE: engine running hot after thermostat installed

you have a bad water pump the water isnt circulationg as it should so you need to replace the water pump and soon before it causes damage

Posted on Jan 22, 2009

  • 184 Answers

SOURCE: P0410 Secondary air injection system fault, P0128 Coolant temp

most ecu controlled vehicles have a 'limp home'mode if 2 or more fault codes are stored,it is designed to get your attention before damage is caused and to get you to the nearest w.shop to fix,i would have codes cleared and retest vehicle,it is the cheapest and 1st option for any shop,some late models even have excessive mileage past service interval in the 'limp' program

Posted on Jul 24, 2009

  • 10 Answers

SOURCE: 2004 Blazer Dome lights, dash lights and headlamps with flicker

bad ground at battery or chase.

Posted on Jan 28, 2010

  • 1311 Answers

SOURCE: 2004 chevy trailblazer-Reduce engine power

You need to get the fault codes read to determine where the problem is that set the SES light. Autozone will scan your car at no charge. At some point you will need to get a mechanic involved to further diagnose the codes.

Posted on Sep 25, 2010

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1 Answer

Reduce Engine light on; battery light on; low charge from charging system; vehicle won't run faster than 30 mph


You may have damaged the ECM with a power surge from shorting out the alternator. Try to reset the CPU program using a code reader and look for fault codes while you are at it

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You would need to know for sure that the radiator is full and that the serpentine belt is not slipping.
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Headlights flicker


this seems most likely a loose connection corrosion or bad connection at one of your fuses or the battery.
start at your battery and check the cables are ok, expecially the Black earth, maybe the connection to the chassis is loose or corroded, ensure this connection is clean. check the connection to the battery is clean and tight. then check the fuse box only do this when the vehicle is swiced off, and spray some contact spray into the fuses a little on each fuse this may resolve the problem.

I hope this was useful

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Low power lean conditions cracked air intake tube GM Testing by a qualified repair person with proper diagnostic tools is the way to a proper fix , not someone guessing !

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1 Answer

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SOUND LIKE ALTERNATOR,FIRST CHECK ALTERNATOR DRIVE BELT MAKE SURE BELT NOT LOOSE AND DAMAGE AND BELT TENSIONER BAD,CHECK THE ALTERNATOR WIRES FOR DAMAGE.CHECK ALTERNATOR VOLTAGE WHILE ENGINE IDLING SHOULD BE 13.5 - 14.5 VOLTS. IF NOT ALTERNATOR VOLTAGE REGULATOR FAILING. FIRST TURN OFF RADIO IF YOU DISCONNECT NEGATIVE BATTERY TO REPLACE ALTERNATOR BECAUSE THAT WILL KEEP YOU FROM LOCKING OUT RADIO AND LOSING THE PLAYING CODE.

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1 Answer

I have a 2004 Hyundai elantra. When driving all my gauges turn off including my odometer and speedometer. My car loses power and the automatic trans. has trouble shifting. My battery completely dies,...


I am having the same problem with my 2004 Elantra. I have had the alternator tested twice and did replace the battery. This morning I had it running ad put a volt meter on it ( red to the battery pos black to the engine block) I did get a reading of 14 volts for about 30 seconds then the idle lowered and the voltage dropped to 12 volts. I tried this again later but could not get a voltage reading above 12 volts with the motor running. Any suggestions?

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Why is the fuel relay buzzing and car won't start? the dash lights are flickering on and off, and the relay buzzes for like 3-5 seconds, and the startes just keeps trying to turn over the engine. it...


sounds like originally your alternator is over charging causing dash lights to come on and flicker while driving then battery is flat(low) causing problem when starting
jump start engine, check alternator charge rate, and get battery recharged and then checked(load tested)

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