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What is the hose that comes out of the air folter and goes into the engine

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There are several hoses. One or more for vacuum. The correct answer depends on your year and other specifics,
However,
Some hoses may be Intake heater, this usually collects heat from exhaust manifold and keeps intake from suffering icing. I witnessed icing at 67 degrees, measured!

Another is part of the Positive Crankcase Ventilation system. This has twom modes: normally filtered air goes in this hose (1/2 inch press fit), throught the engine crankcase, through PCV valve and gets burned. On hard acceleration, the PCV valve closes (to keep backfiring from blowing pan and valve covers off), and crankcase fumes travel into the air filter, then get sucked into the carb for buring. Really a great system and absoultely efficient.

Hope this helps you.

Posted on Sep 09, 2010

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Not sure what vehicle you have, but it sounds like the PCV hose. Is there a small metal valve at the hose where in enters the valve cover grommet?

Posted on Sep 09, 2010

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Gas Cap Loose Service Engine Soon Light On


This can happen if the gas cap is not properly installed. Make sure you hear several clicks when installing. After 10 or so starts the Service Engine Soon light usually goes away.

A second cause could be a problem with the ground wire that comes from the gas cap sensor and goes to the body. Look up into the wheel well by the filler pipe to check.

A third can be the result of a vacuum leak in the fuel evaporator (EVAP) system. Look for any hoses that go from the air intake to a sensor on the fuel rail (fuel injected cars). Many cars have plastic engine covers that have to be removed to see the fuel rails, sensors and hoses. Most require unscrewing the oil filler to get the cover off. You may not think the hose is leaking but replacing may make your problem go away. A small vacuum leak can also affect the fuel flow and affect the engine operation.

My experience is with the 3.8 engine but this probably applies to lots of engines. On the 3.8 it is the two piece hose that comes from the air intake with one small hose going to the top of the engine and the other going across the front of the engine into a hose that does a 180 degree turn that comes back to a sensor. It costs about $25 and is a dealer item.

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Cadilac deville 2001 runs hot when you get into stop and go trffic.


The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.


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Engine overheating in 1999 Cadillac Deville. Cooling fan not coming on but does kick in when A/C is on. This is my Mom's car and I need help


The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.

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