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1998 ranger V-6 ext cab. metal tube that comes off intake manifold behind and below alternater, leaking changes to rubber tube, looks like goes to heater core. what is this tube/hose called ?

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Bypass heater hose

Posted on Dec 14, 2016

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87 ford ranger coolant leak not from water pump replaced it today appears to be coming from right behind it


I can give you a couple of possible causes(1)freeze plugs in the block,there round & look like drink coasters,but are brass(2)intake manifold gasket can be leaking from the corners where water jackets are/also the head gasket both are on all four corners,I don't know what motor you have,but there are pipes that are called crossovers that run from the back off the timing cover to the heater core on the fire wall,sometimes on top of the manifold on one side & there will be a hose connected to it possible bad hose or corroded tube?

Dec 27, 2012 | 1987 Ford Ranger

1 Answer

My 1997 ford ranger a/c dash vents won't blow


Vacuum supply starts on the drivers side of the engine. There is a vacuum line going into the brake vacuum assist from the manifold. branching off of that line is a double line that snakes under the intake manifold, behind the valve cover, along side the valve cover on the passenger side headed to the front of the engine. Then it curves to the right side of the engine. One set of hoses from this line goes to a valve control (red and green i think). The other line goes to the vacuum storage ball, it should be black. The vacuum circuit continues out of the ball in another black line that snakes into the firewall. It goes under the heater core black box and disappears under it. Now go into the passenger compartment and drop the glovebox. look to the back right you will see a black and a white vacuum line coming out of the firewall. The black line is your vacuum supply from the engine. It goes up to a little rubber manifold. disconnect the lines coming from the dash switch and check for vacuum on the manifold where the black line is going in. The white line controls the cabin air intake under the glovebox and the thermostat shutoff under the hood. It should only have vacuum when the switch is in a certian position, AC probly. The other three lines coming off the rubber manifold snake behind the dash vent door assemble and come out near the gas peddle. The red one controls the dash vent. apply vacuum to the red hose and see if the vents go to the center dash position/AC. The yellow and blue? ones control the floor vent control near the gas peddle. yellow gives you half floor and half defrost. blue gives you all floor. you can use a small vacuum line to connect the black vacuum supply to each individual line on the manifold and check the function of each vacuum control assembly individually. I hope this helps. On my truck each control unit works fine when i apply vacuum to them individually but when I hook the dash switch up to the rubber manifold it goes to defrost. I tried changing the dash switch and the lines running from the switch to the rubber manifold and the vacuum ball under the hood, nothing works. I suspect I may have leak i just haven't found yet. next step is to get a vacuum gage and start checking the amount of vacuum i am getting at each vacuum line. I'm sure it is supposed to be getting a specific amount of vacuum and will not work if the vacuum drops below a certian level due to a leak in a line somewhere? God bless.

May 28, 2012 | 1997 Ford Ranger SuperCab

1 Answer

Intake manifold runner bank 1 stuck open. Please help, is it a vaccuum tube, how do i check


You can check by taking off the breather and covering the intake (smother it). If you have a leak it will keep running.

Feb 24, 2011 | 2002 Ford Ranger Regular Cab

1 Answer

Sometimes when slowing to stop engine will drop voltage and stall, already put in new battery alternater maybe?


mcdevito75 here, It could be the air idle sensor or 1 associated, or a vacumn leak at the intake manifold, have your local shop take a look.

Jun 18, 2010 | 2002 Cadillac Escalade Ext

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Leak from 2001 Ford ranger Water Intake Manifold - There is an aluminum part coming out of the manifold on top of the engine that is leaking. It is not on the rubber hose but on the metal part that...


The piece you are describing sounds like the thermostat housing. These housings are normally bolted to the manifold, so you can simply unbolt it. If it is cracked, you will need to replace it. If it is not, you can replace the gasket underneath it and reinstall it.

May 15, 2010 | 2001 Ford Ranger Regular Cab

2 Answers

It leaks coolant under the thermostat houseing between the block and manifold


Sounds like your intake manifold gasket is leaking. This is a very common problem for these trucks.

Mar 28, 2010 | 1998 GMC Sierra

1 Answer

My 2002 Ford Ranger starts fine just replaced the battery. After it starts it will rev up to 1800 then back down to 200. It will do this maybe 3 time before it dies. i can hold the pedel down to keep it...


probably have a vacuum leak where the Upper Ram of the Intake manifold meet the Lower Intake Manifold. Listen for a vacuum leak (hissing sound) near that point, We used to spray a small amount of Carb cleaner near the joint of the 2 Manifolds & observe for a change in the Engine speed, to verify the vacuum leak.

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2 Answers

Coolant leak on top of intake manifold


It is Threaded and you can Use Epoxy or even Gas Line Sealing Tape to seal the Pipe. Please Rate My Response! Thanks!

Feb 08, 2009 | 1998 Ford F150 Regular Cab

1 Answer

1995 cadillac deville v-8 4.9L ----coolant leaks


Freeze plug is leaking or possibly trans cooler line

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