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If I'm understanding you correctly, you're saying there is oil in your reservoir? Could be the head gasket starting to go bad. If you're saying it's leaking out of the reservoir, then you have a crack somewhere in the reservoir or the rubber line that connects to it.
You'll need to pull the bottle out to see where the leak is occuring. Look for
* split hoses from the pump(s). This is the more likely cause of the leak. * pump O-rings. Remove and clean, and reassemble.
If the bottle itself has a crack or split, I've had success using a large 40W soldering iron with a flat tip to to CAREFULLY heat the plastic (often something like nylon) and effectively weld the split back together.
The black rubber hose may be bad and needs replaced. This hose should connect to the radiator at the radiator cap and run along the firewall to the coolant reservoir. Also the coolant reservoir might be cracked and leaking on to the rubber hose, if this is the cause just replace the coolant reservoir which may be a dealer only item, check at you local auto parts store and they will tell you if it is a dealer only item. If you have to replace the coolant reservoir, make sure the car has not been run and the coolant at the radiator is cool, cause when the engine is hot the hot coolant runs into the coolant reservoir till it cools and returns to the radiator when engine is turned off and cools.
Probably any repair you do to the reservoir will not hold you will need to replace, Sometimes you can buy the reservoir separate then the pump on this vehicle I am unsure you will have to consult your parts store ..
No not usually. Sometimes the reservoir will get a crack in it that necessitates its replacement. The washer pump is removable and can be replaced. Most parts houses carry a selection of washerpumps. If all else fails, a universal pump that plugs into the rubber pickup hose from the reservoir will generally work pretty good.
Typically, on a GM truck, there are two 10mm bolts at the top of the reservoir which hold the reservoir to the fenderwall. Remove these bolts, lift straight up on the reservoir, and the tabs cast into the bottom of the reservoir will slip out of their slots in the fenderwall. Remove the reservoir only so far as required to locate and unplug the washer motor wiring harness. The motor sometimes does not come with the replacement reservoir. There are 2, 3, or 4 bolts which hold the motor to the reservoir, and there is a gasket between the motor and the reservoir body. Remove, retain, and re-use these parts on the new reservoir. Check the fluid line near the motor for cracks, and shorten enough to re-use if necessary.
Most of them push in. It sounds as if the reservoir may have a hole or crack in it. If you replace this always use a new one not used. A used one could be contaminated and cause more problems than it repairs.
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