Question about 1999 GMC Jimmy

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My 1999 gmc jimmy is leaking coolant, how do I know if it is the radiator or a water pump problem??? is this a difficult repair if it is the radiator????

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If the coolant is leaking out of the radiator or out of the bottom of the radiator support then it is the radiator. The water pump is attached to the front of the motor. It's directly behind the fan. If the coolant is leaking down the front of the the engine then it is the water pump. Changing the radiator is a relatively easy repair with basic hand tools. I suggest purchasing a Chilton or Haynes manual for your vehicle. It will do wonders for your confidence having pictures and step by step guidance while you do the repair project.

Posted on Feb 23, 2010

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1 Answer

I have a 91 Jimmy, I have a coolant leak and can't


how about the heater core?most times it will leak inside the vehicle.. but its just a guess

Sep 27, 2013 | Cars & Trucks

1 Answer

My 1998 jimmy has always leaked antifreeze but the last month it has got bad to were i have to fill it up everyday


You need to get or rent a coolant system tester and identify where it is leaking from. They are very simple to use. You just remove your radiator cap and install the tester and pump up the cooling system and then you watch for where the coolant is coming from. Look closely at your water pump, intake manifold gasket, radiator, heater hose coupler on the intake manifold, and coolant hoses. Those are all the common leak areas.

May 21, 2011 | 1998 GMC Jimmy

1 Answer

My 1995 GMC Jimmy is overheating.. it had a leak and we found that it was leaking coolant from the rear freeze plug that has been fixed no more leaking, but it still over heats we bought a new water pump,...


Check that the fan is turning in the right direction, in all the changes it is possible that you may have crossed the fan wires and not the fan is blowing forwards instead of backwards. Also check that there are no air locks in the system and that there is a positive flow of coolant.

Mar 08, 2011 | 1995 GMC Jimmy

1 Answer

I have a water leak in the back of the engine fan


there is a small "weep" hole in the water pump. When the bearing seals go out on the water pump coolant will exit this hole.

Oct 29, 2010 | 1999 GMC Jimmy

1 Answer

I NEED DIRECTIONS ON HOW TO REPLACE MY WATER PUMP


Remove or Disconnect
  1. Coolant from the radiator.
  2. Multiple ribbed drive belt.
  3. Upper fan shroud.
  4. Fan and fan clutch assembly.
  5. Coolant pump pulley.
  6. Radiator outlet hose clamp and hose.
  7. Bolts and stud.
  8. Coolant pump.
  9. Gasket(s). Inspect
    • All parts and replace as necessary.
Important
  • Be sure all mating surfaces are free of burrs or other imperfections.
Install or Connect
  1. Gasket(s) in place.
  2. Coolant pump.
  3. Bolts and stud.
    • Sealant (GM P/N 1052080 or equivalent) must be applied to the bolt threads.
Tighten
  • Bolts and stud to 41 N.m (30 ft. lbs.) , 4.3 engines.
  1. Radiator outlet hose and clamp.
  2. Coolant pump pulley.
  3. Fan and fan clutch assembly.
  4. Multiple ribbed drive belt.
  5. Upper fan shroud.
  6. Coolant to the radiator. Important
    • Start the engine and check for leaks.

May 06, 2010 | 1993 GMC Jimmy

2 Answers

Engine is pouring antifreeze all over the ground and over heats?


Start the vehicle. Check the radiator, hoses, and water pump for leaks. Look at the location of the leak. Is it under the radiator or further back under the water pump? If coolant is leaking from vent or "weep" hole on the water pump, then the pump is defective. If you can find no leaks, then it is most likely a faulty thermostat. Hope this helped and best wishes.

Aug 05, 2009 | 1999 GMC Jimmy

1 Answer

Waterpump leaks


Maybe. You could put an additive in, at the radiator cap, but there is no saying it will stop the leak. Are you sure it's the gasket and not the water pump itself. It has abuilt in leak to let you know it's wearing out. Check under the water pump and see if your coolant is coming out of the small hole on the bottom of the pump. If it is change the pump.

Aug 01, 2009 | 1992 GMC Jimmy

1 Answer

I need directions to change my water pump


drain engine coolant.relieve belt tension .and remove the drive belt.remove upper fan shroud.remove fan or fan and clutch assembly.remove water pump pulley and coolant hoses from water pump.remove water pump bolts.then remove pump from engine.pay attention to bolts location because they are different lenghts.clean water pump gasket mounting surface dont scratch .or pump gasket wont seal and leak .apply sealant to water pump bolts.install water pump with new gasket.if gasket paper put a sealant on it.torque water pump bolts to 30 ft lbs.if you got a 2.2L engine torque water pump bolts to 18 ft lbs.install coolant hoses on pump .install water pump pulley.install fan and fan clutch assembly.install the drive belt .and the upper fan shroud.fill the radiator with coolant.then run engine to check for leaks.WARNING AS A SAFETY PRECAUTION REMOVE NEGATIVE BATTERY CABLE SO CAR WONT BE CRANK BY ACCIDENT. ALSOOOO DONT FORGET TO TURN OFF RADIO FIRST BEFORE DISCONNECTING BATTERY SO YOU WONT LOSE YOUR RADIO CODE.

Jun 01, 2009 | 1999 GMC Jimmy

2 Answers

1999 GMC Jimmy Running Hot w/ Engine coolant reservoir empty


I guess the burning question is , where is the coolant going.
Is this a 4.3 engine? How many miles does the vehicle have?
Has the intake gasket been changed?
I'm guessing a can of "Bars Leak" may cure your problem.
Let me know.
Regards,

Apr 03, 2009 | 1999 GMC Jimmy

1 Answer

Trouble starting


Sounds like the head gaskets are leaking.

Nov 09, 2008 | 1999 GMC Jimmy

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