Question about 1987 GMC G2500

1 Answer

2002 vortex 4.3

Flushed heater core out, got water on motor ,ran fine for about 15 min then started to miss then died ,doesn't run .seems like it doesn't have full fire, looked at cap and rotor, seems fin?

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • GMC Master
  • 50,084 Answers

Spray the cap and distributor and all the HT leads with a water dispersant (wd-40 or CRC spray) Any moisture in the cap will cause a ht short circuit and any dirt tracks outside will do the same.

Posted on Feb 09, 2014


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

  • 3854 Answers

SOURCE: 2001 GMC Safari. Changed spark plugs, rotor cap

Try changing the fuel filter and checking the fuel pressure at the shredder valve. The readings should be 60 to 65psi with the fuel line pressurized with the engine not running, once the engine is running. It should drop by 5psi. Start with the simple things first. Keep me posted, be glad to help.

Posted on Jun 28, 2009

  • 3 Answers


Check the fuel cap!! If the vacuum relief is not working it can impede the fuel flow and cause the engine to shut down or not restart after a stop. Waiting usually gives things a chance to stabalize and the engine will restsrt. When this happens again try loosening the cap and see if the engine will restart.....If it restarts immediately, REPLACE the fuel cap..Do Not leave it loose because this will cause other problems. If it is not the fuel cap the problem may be the filter, the fuel pump, or aome other fuel system malfunction.

Posted on Jan 24, 2010

Testimonial: "Great will try it "

  • 1 Answer

SOURCE: flushing the heater core

I removed the hoses and took a air nozzle at low pressure and blew in the return hose connection of the core. A big chunk of paste like substance shot out then pure liquid. I put the hoses back on and tested it. Now its blowing hot!!!!!!!

Posted on Dec 14, 2010

  • 784 Answers



Posted on Mar 07, 2011

  • 189 Answers

SOURCE: 90 gmc sierra no start

did you use the dylectric grease that should have came with the ignition module?
the module can be ruined by excessive heat, the grease is to insulate the module from too much heat.
also check for lose connections.
hope this is helpfull

Posted on Oct 27, 2011

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

2001 Taurus No Heat

heat control valvue could be stuck closed not allowing water to pass through the heater core

Nov 25, 2012 | 2001 Ford Taurus

1 Answer

Pontiac sunfire overheating

hello! I had the same problem with my 2000 Pontiac Sunfire... there might be one of these 2 problems with it.... maybe the Heater Core is jammed and the coolant dosen't flow thru the engine to cool it off, or the water pump is defective.... does the heating works or not? if yes, the water pump is defect, if not, the heater core is jammed, try a ''radiator hose cleaner'' (sold in Napa's or Carquest..) it will act as a kind of ''decloaker''.. if works, good! 15$ solution... if not, replace Heater Core... ~150$

Jan 09, 2012 | 2000 Pontiac Sunfire

2 Answers

Thermostat and engine heat seem fine, seems that heat knob, gears and cable are all working fine, but have practically no heat from heater.....96 Dodge Ram 1500 4 x 4. No problems with ducts switching...

Hello. First, does the fan speed work correctly? When you put it in the high possition does the air come out faster?, if so, raise the hood, look back on the firewall, ( behind the motor ), and locate 2 hoses that are about 1 1/4 inch in diameter that both hook up to pipes on the firewall. This is your inlet, and outlet for your heater core. I suspect you will find that these hoses have been joined together to bypass the heater core. Often when a heater core is leaking people don't have the money to replace the heater core, they generally cost $300 to $400 and sometimes more, then you have to pay the labor, in some cases, to remove about half of the dash to get to the heater core. This repair can be expensive indeed, so, often people just bypass the heater core by joining the inlet and outlet hoses of the core directly together skipping the core altogether.
Good luck!

Jan 09, 2011 | Dodge Pickup Cars & Trucks

1 Answer

Heater not working... dealership said I needed a heater core? said it was "clogged".... $1600 parts and labor.. any other suggestions?

This helped on a different vehicle. I disconnected both heater hoses and connected my own hoses to heatercore. Flushed it,then poured in a 50/50 of water and CLR (like one tv). Left it for 15 min then flushed it again. The water and clr came out totally white with deposits. It did help.

Jan 01, 2011 | 2002 Volkswagen Passat

1 Answer

2002 buick lesabre custom has had issues lately with at speed 50-55 it kinda misses and just yesterday overheated and has no heat, i put a new thermostat in did not fix the problem but the radiator was...

if your radiator has a cap remove it and start the motor turn the heater on high and put it on defrost watch the coolant when the bubbles stop coming out and the fluid is at a full level there should be no more air in the system. a miss fire is caused by bad plugs or plug wires and i would back flush the heater core remover the hoses going to the firewall and flush the heater core with water from your garden hose. to check the water pump start the motor and watch the pump to see if any fluid comes from it.

Dec 16, 2010 | 2002 Buick LeSabre

2 Answers

Heater core problems no heat changed thermostat still no heat any ideas

try flushing cooling system could be a blocked heater core.if flushing doesnt work remove and replace heatercore.

Nov 26, 2010 | 2002 Ford Taurus

1 Answer

No heat. Changed the thermostat and flushed the radiator, had heat, now two weeks later no heat. Might be the heater core, yes/no, is it difficult to change? Just wanting to know.Where can I find...

I'ld say yes, heater core. But before swapping it out try this. There are two hoses that lead to your heater core. Disconnect them and add two longer hoses to it. Run one down to a bucket on the floor. The other flush with high water pressure, then there is this acid you can add. WARNING, I DID SAY ACID. It will eat your skin and if you leave in your heater core too long it will eat you core too! After say 2-3 mins flush with high water pressure again. On second flush I'ld flush for a good 10 15 mins to make sure it's all out. Reconnect factory hoses and refill system.

Jan 27, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

1999 Taurus-NO HEAT-replaced thermostat,flushed heater core,still NO HEAT,ANY SUGGESTIONS?

Sounds like the problem has to be the valve is not opening and thus not allowing the hot coolant to enter the heater coil. Manualy open the valve (engine firewall) and see if heat is present. If this works check your cable from the dash switch as it isn't working the valve properly and needs replacing.

Dec 29, 2009 | 1999 Ford Taurus

2 Answers

When I turn my heater on, it doesnt blow out warm or hot air. I have had the coolant flushed. A/C works fine. Blower motor works fine.

your core is clogged. This is what I was told by Hibdons Tires Plus, unless you specify them to flush the core when they flush your coolant it doesnt get flushed. It is simple to do yourself. disconnect both hoses running from firewall where they connect to engine. spray water from the garden hose through both of them untl it comes out clean. it took me about 15 minutes to flush mine and then I had heat again. I had my coolant flushed and then flushed the core about a week later and all kinds of junk came out of my core. give it a try, I think it will work for you.

Oct 09, 2009 | 1995 Ford Thunderbird

2 Answers

No heat

The heater core may very well be plugged and in need of replacement. a repair centre can confirm that.


Aug 28, 2008 | 2004 Ford Taurus

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

37 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

79186 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides