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Re: loosing coolant in 2003 GMC Jimmy, had new rad...
Go to a self-serve car wash and hit the bottom of the engine with a water jet to clean it off. then after driving the truck, stop the engine and get underneath and look for the path of water. I like the water pump as a suspect.
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What is the problem with the intake, is it leaking air, coolant oil or a combination of the 3? The answer really depends on your particular concern with the vehicle. Is it the upper or lower intake? What size engine do you have?
It is probably either an intake manifold gasket or a rear engine freeze plug. If it is a freeze plug, the transmission will have to be removed to fix it and if it is the intake gaskets, the intake manifold will have to be removed. I would recommend using an inspection mirror to look at the back of the manifold to see which it is.
I had this happen to me the first time I replaced my intake manifold gaskets. It was hard to install the intake and gasket moved just enough and I had a coolant leak. Removed manifold and installed new gaskets and problem was solved. Good Luck.
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.
Here is a detailed summary on the procedure of how to replace the intake manifold gasket on a 1996 gmc jimmy;
REMOVING THE UPPER INTAKE MANIFOLD(PLENUM)
Disconnect Battery (may not be absolutely necessary, but a good practice to avoid shorting a positive wire to ground).
Remove serpentine belt.
Drain the coolant.
Remove air cleaner ducting and disconnect wires.
Disconnect throttle linkage and bracket.
Disconnect cruise control cable.
Remove brake booster vacuum hose at manifold.
Remove PCV hose.
Remove ignition coil and bracket.
Remove purge solenoid and bracket.
Relieve fuel pressure at test port.
Remove fuel lines and bracket.
Remove upper intake manifold.
REMOVING THE LOWER INTAKE MANIFOLD
Remove the distributor and label the spark plug wires.
Remove heater hoses and bypass hose.
Remove upper radiator hose.
Remove EGR valve?
Remove sensors and bracket on right side.
Remove EGR tube, clamp and bolt.
Remove PCV valve (and replace).
Unbolt A/C compressor and move it aside.
Loosen compressor bracket and slide forward, but do not remove it.
Remove alternator bracket bolt (or remove alternator and set aside)
Unplug all vacuum lines from intake manifold.
Unplug all electrical connectors from manifold.
Take note of the intake manifold bolts and mark the location of the bolts.
Remove intake manifold bolts, and manifold.
Clean mating surfaces
THE MAIN INSTALLATION
Set the new gaskets in place and apply silicone to flat areas on front and rear of engine block.
Apply thread locking compound to manifold bolts.
Install the manifold and tighten bolts to 35 ft-lbs, in proper sequence.
Install the distributor.
Install the upper intake manifold.
The remaining installation procedures are basically the reverse of removal.
Either one of the coolant hoses routed near the firewall is leaking (heater core lines, etc) or the intake manifold gasket (common failure point on those vehicles) is leaking and will need to be replaced. You will have to either run the engine or pressurize the system and look for leaks.
Follow the upper radiator hose to the outlet elbow (the waterneck!) and it is located under it:
Removal & Installation
Drain the radiator until the coolant level is below the thermostat level (below the level of the intake manifold).
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.
Remove the water outlet elbow assembly from the engine. Remove the thermostat from inside the elbow.
Install new thermostat in the reverse order of removal, making sure the spring side is inserted into the elbow. Clean the gasket surfaces on the water outlet elbow and the intake manifold. Use a new gasket when installing the elbow to the manifold. On later models the thermostat housing may have been sealed with RTV sealant. If so, place a 1/8 inch bead of RTV sealer all around the thermostat housing sealing surface on the intake manifold and install the housing while it is still wet. Refill the radiator to approximately 21/2 inch below the filler neck.
If the thermostat is equipped with a pin hole, be sure to install pin side facing upwards.
Usually intake has to do with the induction system, as in intake manifold , The intake manifold can have several types of leaks, the intake can have a vacuum leak, oil leak, coolant leak or a combination of any of the before mentioned....hope this helps,
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,