Question about 1999 Jeep Grand Cherokee

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Had the exact same problem, checked under hood and vacuum hose

Had come off. Put it back on and everythings fine now. Thanks Chryslerguy. CJ North Carolina

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Vacuum hose had come off. Put it back on and everything working fine.Thanks to Chryslerguy for the help.

Posted on Jun 17, 2009


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1 Answer

How come i dont get no heat?

The heater core may be plugged with rust. Good way to test it is with the engine warmed up put the controls in heat mode and then go under the hood and locate both water hoses going t the heater core. Hold on to both hoses to see if the temperature of both hoses are the same. If not, no water is getting into the core. . If the temp is the same, then control vacuum is not working. There is a check valve in the line to the control head that prevents vacuum fluctuations from moving the blend door when accelerating. Check it.

Sep 25, 2016 | 2001 Chevrolet S-10

1 Answer

Where can I get an engine vacuum line routing diagram for 2001 JEEP CHEROKEE 4.7?

in uSA/?
open hood, look up, and under, see that vacuum map.
or read the FSM
all that is covered in the huge book,, just read it.
did the lines fall off? what is the reason to ask? JOB at hand.?
there is very little engine vacuum lines.
there is brake, cruise, HVAC, too.
a vacuum reservoir
the emission page covers most. EVAP, is one.
and fuel. (FPR reg uses vacuum)
would be nice if you named one hose loose.
not ask for them all.... but you can read the book , like all can.
MAP sensor does not use lines
if one hose lose. tell where it goes,?????????


Dec 17, 2015 | 2001 Jeep Cherokee

1 Answer

I have a 1997 jeep cherokee. In the morning, it starts just fine but as it gets warmer, it will stall and die and I have to put starter fluiud in the air intake to start up again. I have changed the fuel...

The age of your vehicle guarantee's a vacuum leak. It may sound silly but the truth is rubber grommets and hose's shrink and dry out over time and the harsh environment under the hood makes it worse. Check all vacuum lines and fittings attached to the intake manifold, valve covers(pcv valve), and be sure to check for a vacuum fitting on top of the intake just behind the throttle body. Does it fit tight in the hole? You can seal loose fittings with a high-temp RTV (Red) silicone sealant/adhesive. Several small leaks add up and your engine, heat/AC, will be all to glad to tell you about it.

A vacuum leak will cause exactly what you said your engine does.

Aug 24, 2011 | 1997 Jeep Grand Cherokee

1 Answer

2002 ford explorer....Just changed the blower motor. Everything worked fine for a few days and now the air will only come out of the defrost and floor vent areas. When I turn the vent selector switch...

Check under dash in duct system for any vacuum hoses blown off then check under the hood on the passenger side of engine compartent.If all hoses are connected then you will have to check the heater blend door actuator and the heater blend door lever for proper operation.

Aug 04, 2011 | 2002 Ford Explorer

1 Answer

Heater air will only come out at windshield

your a/c controls in this vehicle are vacuum operated. you more than likely have a vacuum leak that can be under the hood or under the dash. take a look under the hood and inspect all of the vacuum hoses, mainly the small colored hard plastic hoses. if your car also runs poorly that means you may have a leak in your engine vacuum, check larger black vacuum hoses and rubber seal on brake booster that manifold vacuum hose goes to. if no leak found under hood check those colored hard plastic hoses. with any luck you'll have heat blowing throuh your vents in no time.

Dec 16, 2010 | 1996 Ford Mustang

2 Answers

AC is blowing cold air, but it is coming out of the defrost and not the front vents. Why are the front vents not working?

Check over on the passenger side under the hood by the fire wall, there will be some elec. connection, just below that there will be a small vacum line that should go into your fire wall, check that it has vacum, it should also have a one way valve, small round looking some time that get clog, needs to have vacum that is what power the blend door's.

Jun 30, 2010 | 2003 Ford Expedition

1 Answer

A/c blows at bilevel even though it is selected for upper vents

probably a vacuum hose. Check all over under the hood. Have it running and listen for a hiss while wiggling hoses around. I ran into the same problem a while back, and it was a cracked hose in about the middle of the intake. Be sure and check the hose to your vacuum pot, too. They are quite often mounted to the under side of the hood, and should ahve a vacuum line running to it.

Jul 24, 2009 | 1995 GMC Suburban

2 Answers

Vents blow hot air all the time and heater/ac controls do nothing

I had the exact same problem with my '85 300ZX. Turned out to be a vacuum hose under the dash that had come loose. I noticed that others were brittle and would soon probably crack, so I replaced them all. There is some good info at

Jan 25, 2009 | 1985 Nissan 300ZX

3 Answers

Air Vents

Check the vaccume line going into the firewall. Mine dry rotted and I had the same problem. I replaced the line and now it works fine.

Jun 14, 2008 | 1997 Jeep Grand Cherokee

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