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Most brake systems use brake fluid, not oil. Most cars and trucks have a reservoir under the hood on the firewall with a removable cap where you add fluid. The cap will usually have information as to the type of fluid to use. If you are losing fluid you may need to have someone find the leak, as having the brakes fail while driving can be dangerous.
Holts Wondarweld Flush engine. EXTERNAL CRACKS 1 Run engine until hot,drain off enough coolant to remove thermostat. 2 Remove thermostat. 3 Mix contents of can thoughoughly! and pour contents into thermostat opening. 4 Replace thermostat cover.& fill radiator with hot water,replace radiator cap. 5 Run engine at a fast idle for 15 mins,dont allow to boil.Top up if necessary. 6 Leave Wondarweld in system for 2-3 days then drain off,flush system replace thermostat and refill. HAIRLINE CRACKS 1 MIX thoroughly and pour into cold engine (radiator if it has a cap) 2 Run engine until hot. 3 Allow engine to cool then run again until hot. 4 Follow procedure 6 above. INTERNAL CRACKS 1 Follow external crack instructions except after pouring Wondarweld into engine remove spark plug from affected cylinder and run engine for 20 mins. If more than one cylinder affected run for 5 minute intervals. 2 Allow engine to cool then drain cooling system and refill with clean water. 3 Drain sump & flush,refill with fresh oil. Note:- 1/2 pint of Wondarweld for every 6 pints of water,DO NOT add antifreeze for at least 3 days after process.
When was the last time you tuned up your Jeep? Spark plugs, cap and rotor can certainly attribute to if not cause the problem you are describing. Definitely sounds like a fuel problem (too much fuel being dumped in the cylinders.)
The differential will have a plug in the driver's side of the housing that is removed with a 3/8" drive ratchet or square drive. Be sure you know what type of fluid is recommended for your vehicle. It will depend on whether it is a locking differential or standard.
if oil and transmission is not leaking, then no reason to fill them. The oil dipstick is marked with an "ADD" and "FULL" mark. Pull the oil dipstick and check the fluid level. It is is at ADD or below, add 1 quart and repeat the process of checking the level.
To check the trasnsmission fluid, you have to start the car, let it warm up for a few minutes, and then check the dipstick while the car is running.
radiator antifreeze: open drain **** on radiator and drain refill with water re plug and leave radiator cap off. start vehicle. watch when coolant drops or rises drastically as that is the thermostat opening. at that time re open drain **** and fill radiator with hose water at the same time. when water coming out is completely clear again turn vehicle off and drain radiator again. fill with antifreeze and water mix. 50/50
oil: jack up car, find oil plug, directly behind steering rack on oil pan. undo plug and drain oil into container. while oil is draining remove oil filter. wait for oil to drain completely then re-install drain plug and new oil filter(filled with oil) undo oil cap and pour in oil 4.5 quarts on n/a and 5 for turbo. tighten cap and your done.
brake system: dont attempt, use an experienced mechanic as the lines need to be bled in numerous places including inside the car from the abs module mounted behind the passenger seat.
easy brake system: individually bleed brakes while adding fluid until clear fluid comes out. (not efficient)
a/c: do not attempt unless you have an evac pump for ac systems.
clutch: same as easy brake except using the bleed valves at the slave cylinder and on passenger side fender well.
washer fluid: add fluid and squirt a little to make sure there is no air in the line
In most cases, the problem is the system is low on refrigerant. The AC compressor requires a minimum of 20psi of refrigerant to turn on. There are refill kits available at the auto parts stores. If doing this yourself, select a kit that includes compressor oil, and a refill hose.
RECHARGING AC SYSTEM
Turn the truck on and turn AC on HIGH
Locate the low side AC line (will have a valve and cap similar to the cap on a tire)
Insert the oil or R-134A can to the hose (Do not turn the screw to puncture the can yet)
Insert the other end of the refill hose to the low side valve
Puncture the R-134A can with the screw on the refill hose
You should feel the system suction the refrigerant out of the can
Check for frost on the AC lines and the air blowing inside the truck
If frost develops and the air is cold, you've successfully recharged the system and disconnect the refill hose. DO NOT ADD MORE REFRIGERANT...overcharging the system will damage your compressor and will be less effective
Hopefully this answers your question and you're able to get your AC working again. Best of luck.
The Cobalt transition is sealed and do not have a place to user/owner-refill the oil. The oil should work fine 50,000 miles and then at the 50M inspection the dealer should check it and refill it if necessary or change it.