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JusT changed out the heater core on my 1991 gmc sonoma 4.3l v6. Put everything back together to find that no air will come out of All vents Including the floor ones.

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  • 267 Answers

You may have missed a vacuum hoses for one of the heat control doors

Posted on Apr 22, 2015

  • Anthony erickson Apr 22, 2015

    Theres no sound when I adjust the power from lo to hi, did I possibly accidentally disconnect the fan?

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  • 229 Answers

Retrace all steps and see what is unplugged.

Posted on Apr 22, 2015

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: NEED TO REMOVE DASH TO

yes you have to remove the whole dash assambly to replace the heater core..have fun i had to do mine twice.my new heater core lasted about 6 months.

Posted on Mar 30, 2009

  • 1071 Answers

SOURCE: GMC Sonoma SLE 4.3L 1991- Coolant Temp Gauge Not reading

there are 2 coolant sensors one for gauge and one for ecm

Posted on Jul 23, 2009

dnewcombe1
  • 1564 Answers

SOURCE: Replacing heater core in 2000 GMC sonoma. Dash is

If the dash is removed you've saved about 9 10ths of the job endurance. Look around, what you believe to be, the perimeter of the heater box. I cannot, and no one else can, tell you exactly where the bolts and nuts that mount the heater box are. Therefore you must viually sixe the box and check outide in the engine compartment and inside under the dash for the mounting bolts.You'll want to start by removing the heater hoses. Then starting at the passenger side engine compartment look for a group of 10mm or 7/16ths nuts retaining the housing and remove them. Do the same inside. The housing is usually held together with screws or clips, it changes year to year. Keep a log or pix of the wires and cables and hoses(vacuum) that are connected to the housing for reassembly. You'll need to "roll" the box out from under the dash depending on how much of the dash has been removed. The core is easy to spot for is has two hoses sticking out, and, is encircled with clips or screws . Also make sure you remove the bracket around the two entry hoses if it has one. Thank you, Dana

Posted on Oct 04, 2009

unvme
  • 266 Answers

SOURCE: how to replace heater core 1998 gmc sonoma

your heatercore is behind the glovebox, get you a cordless drill, #2 phillips, torx 10,15,20 , 8mm, 10mm, sockets, you are going to remove 1/2 of the dash, take picts of were the 200 bolts and screws come out at, it should take you 12 hours to fix it, have fun

Posted on Sep 06, 2010

  • 13 Answers

SOURCE: How do change Heater core in a 1999 gmc sonoma

By removing most of the dashboard. its behind the glove box buried under all of the stuff you see there and then some.
It is possible, but not easy and takes time, but its worth it because a shop will charge you over 500 and the part is around 100.
If you get into it and get stuck, post another question.

Posted on Sep 19, 2010

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Dec 12, 2015 | 1991 GMC Sonoma

1 Answer

My 2000 gmc truck is leaking water from the heater and vapor enters the cab through the air vents


your heater core is leaking in to the cab.you need to change the heater core

Sep 07, 2011 | 2000 GMC Sonoma Extended Cab

2 Answers

NO HEAT BLOWING COLD AIR


Make sure the coolant level is full. If coolant levels are ok you made need to replace the thermostat .You can disconnect the heater hoses going to the heater core and flushing water through with a garden hose at low pressure. If the vehicle has the 4.3L engine these are quite prone to heater cores plugging up. Would try flushing the heater core first.If that does not work most likely the thermostat is causing your issue. Be sure to fill coolant back up after servicing and allow air to bleed from the cooling system.

Dec 01, 2010 | 2003 GMC Sonoma Extended Cab

2 Answers

Heater doesnt work blows cold air, replaced thermostat and flushed heater hoses appears to have no flow through heater core, but lines arent plugged on a 1995 gmc sonoma. Why is the hot air not flowing...


This is what I did to solve the exact same problem.I got a pump that you can hook to a drill that has garden hose connections on it.I made 2 hoses to pump into my heater core and hook to the pump. I bought some radiator cleaner at Auto Zone and put it in a 5 gallon pail with about 2 gallons of hot water.I pumped the cleaner from the pail into the OUTLET side of the heater core.(By going in the outlet side you are back flushing the core.) I put an old cloth over the top of the bucket and let the outcoming cleaner run onto this cloth acting as a filter for the dirt coming out of the heater core and let the pump run about 10 minutes. Believe me,A LOT!!!!!!!!!!! of dirt,rust etc. came out of my heater core. The heat now works excellent! Good luck.

Jan 05, 2010 | 1995 GMC Sonoma

2 Answers

Replacing heater core in 2000 GMC sonoma. Dash is


Usually the whole hvac box has to come out of the vehicle to replace the heater core. Once the box is out it can be opened and the heater core removed. Be careful with all the vent doors and actuators, make note of how everything came apart. The last thing you want to do is have to remove the dash and box because something wasn't on just right. Good luck.

Oct 04, 2009 | 2000 GMC Sonoma Extended Cab

1 Answer

Won't idle


Try cleaning the throttle plate with carb cleaner and a toothbrush, be sure to clean the edges.

Aug 03, 2009 | 1991 GMC Sonoma

2 Answers

GMC Sonoma SLE 4.3L 1991- Coolant Temp Gauge Not reading


there are 2 coolant sensors one for gauge and one for ecm

Jul 23, 2009 | 1991 GMC Sonoma

1 Answer

Got heater core need to put it in,want to now how to do it the right and fastest way


In order to replace a heater core in a 1998 gmc jimmy the coolant must be completely drained and the entire dash including radio, vents and panel covers must be removed. four screws hold the top portion(closest to the windsheild) in place. they can be found under the windshield defrost vent. after the entire dash is removed a safety harness under the steering column must be removed and the steering column must be dropped to the driver seat. The heater core housing(black plastic) is located right center of the dash and is a two part housing one piece on top of the other. the housing is attached to the fire wall and must detached before replacement can continue. after detaching the housing from the fire wall separate the housing by unscrewing the six screws that hold it together. the heater core is now exposed. disconnect the heater core from the two hoses and discard. installation is the un installation process in reverse.
Good luck, it is a very long and drawn out process that is not accomplished in just an hour or two . make sure you have most of the day or several afternoons to finish . i started this and it took me 2 afternoons to take apart and put back together 

May 29, 2009 | 1998 GMC Jimmy

4 Answers

The heater still won't work after I changed the thermostat on my


Get a female garden hose adapter from the local hardware store. Disconnect the heater hose from behind the fan pulley and attach the hose connection. Disconnect the other heater hose behind the alternator, aim it towards the ground and flush water through the heater core. This worked on my truck.

Feb 12, 2009 | 1999 GMC Sonoma

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