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1996 GMC Jimmy Overheating

Tiny
DONJ808
  • MEMBER
  • 1996 GMC JIMMY
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
Hi,
My 1996 Jimmy is overheating. I recently replaced the thermostat and the water pump. Also the heater is working erratically blowing cold air mostly. If I turn up the heat to high and give a lot of gas to the engine, after a few minutes it will lower the gauge below 210 however it continues to creep back up to the red level afterwards. At this point I have no clue what is happening. Any ideas will be helpful. Thanks.
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Wednesday, January 2nd, 2008 AT 10:21 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try bleeding the cooling system

Always bleed air from cooling system after replacing coolant. Set heater for maximum heat. Remove radiator cap. Loosen drain plug and remove drain bolt (if equipped) from engine block.

Drain coolant reservoir. Fill coolant reservoir to MAX mark with 50/50 water-coolant mixture. Loosen bleed bolt and fill radiator up to base of filler neck. Close bleed bolt when coolant flows out without bubbles. Tighten bleed bolt.

With radiator cap removed, start and operate engine to normal operating temperature. Add coolant if necessary and check for leaks.
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Wednesday, January 2nd, 2008 AT 12:11 PM

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