Why oil is leaking from air cleaner 1999 chevy venture?

I couldn't find a heater hose diagram specific to the 1999 Chevrolet Venture with rear heat and air, but I can give you the general location of the heater hoses and how to identify which ones go to the rear heat. The heater hoses on a 1999 Chevy Venture are located on the passenger side of the engine compartment. There are two heater hoses, one that is hot and one that is cold. The hot heater hose will be connected to the heater core, which is located under the dashboard. The cold heater hose will be connected to the engine. To identify which heater hose goes to the rear heat, you can look for the hose that is connected to the heater core outlet that is labeled "Rear Heat." The other heater hose will be connected to the heater core outlet that is labeled "Heating Core Inlet." Once you have identified the heater hoses that go to the rear heat, you can reconnect them to the heater core. Be sure to use new clamps when you reconnect the hoses. Here are the steps on how to replace the heater hoses on a 1999 Chevy Venture with rear heat and air: Disconnect the negative battery cable. Drain the coolant from the radiator. Remove the heater hoses from the engine and heater core. Install the new heater hoses. Fill the cooling system with coolant. Reconnect the battery cable. Start the engine and check for leaks.

use carb cleaner to find leak on vacuum hose. TPS--MAP Mass air flow sensors need checked

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there is a drain plug on the bottom of the oil pan you remove to drain the oil its ether a 15mm or 14mm wrench while the oil pan is draining out unscrew the filter apply a thin coating of oil on the gasket of the new filter make sure the gasket from the old filter didn't stick to the engine install the drain plug and new filter add 4 quarts of new oil and run the car recheck for leaks and oil level that one holds 4 quarts or 4 and half not sure but 4 will be safe to start the engine

it may be a slow leak in the system or it may have ait in the lines go under the hood there will be two valves a high and a low side test both and see if you have any freon if so it may be air in the line or even a bad comprssor clutch but not likely

It is located in the air cleaner.Take off the air filter cover/air boot.\Then there are 2 8mm headed bolts on the top of the air cleaner.remove the two bolts and pull off the cover.The pcm is located behind there.

plugs,plug wires and air cleaner, change oil and filter and tranny fluids. rotate tires, check tire pressures. totally flush radiator out, install new fluid and "water pump lubricant"..... and most important check all coolant lines for cracks or little leaks around fittings. coolant hoses don't last forever you know....and last but not least... your belts, espescially the idler pulley assembly for a good solid snap back return when relased. use a semi premium gas.... like a techron or shell that have an added chemical that will keep the internals parts cleaner and run more efficient. 89 octane will do just fine. you get what you pay for when you buy cheap gas.

1. Remove air cleaner and duct assembly.
2. Drain the coolant.
1. Remove the engine mount struts.
2. Remove the cooling fans with the cooling fan shroud.
3. Remove the radiator upper hose from the radiator.
4. Remove the radiator lower hose from the radiator.
5. Disconnect the transaxle oil cooler lines from the radiator.
6. Remove the radiator brackets and bolts.
7. Remove the radiator. Installation Procedure
1. Install the radiator. Notice: Refer to Fastener Notice in Service Precautions.
1. Install the radiator brackets and bolts.
• Tighten the bolts to 24 Nm (18 ft. lbs.) .
1. Connect the transaxle oil cooler lines to the radiator.
2. Install the radiator upper hose to the radiator.
3. Install the radiator lower hose to the radiator.
4. Install the cooling fans with the cooling fan shroud.
5. Install the engine mount struts. Notice: When adding coolant, it is important that you use GM Goodwrench DEX-COOL (R) or HAVOLINE (R) DEX-COOL (R) coolant. If Coolant other than DEX-COOL (R) or HAVOLINE (R) DEX-COOL (R) is added to the system the engine coolant will require change sooner; at 50,000 km (30,000 mi) or 24 months.
6. Fill the cooling system.
7. Install the air cleaner and duct assembly.

sounds like u might have a blown head gasket is your oil milky colored

I believe this is an evaporative system leak such as a loose gas cap or leak in an evaporative system line.

easy to change u just need a special tool for removed on front of motor at right of oil filter its look like a coolant sensor or a little bottle with a connetor removed the connector and take the tool to remove