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    Heater Core Hose Intake Replacement

    Folks, I have another problem, seems like I fix one, and another comes up to take it's place...I have a coolant leak.....they symptom is the coolant dripping down the back of the engine, I recently had to replace the gasket for the oil filter bypass, so it looks as if I am going to have to pull the upper intake manifold off, I had to do this once before, (for a failed gasket...causing a misfire on #8)but I had a ASE certified mechanic helping me all along the way and it was several years ago... I know I am going to have to disconnect the battery (-) side, disconnect the fuel lines, pull the coil packs, pull the plugs, disconnect the main wiring harness, possibly pull the fuel rails, and then pull the upper intake manifold just to access the hose. The leak is getting progressively worse- all to replace the a $17 hose(add an additional $88 for the intake manifold gasket kit)....which BTW cannot be ordered from the dealer....is there a chapter in the Haynes repair manual for this?, and if so, where can I find it? any help/pointers is greatly apprecieated
    In theory, there is no difference between practice and theory, In practice there is.....


    My Rides:

    01 F-150
    02 MGM

    My Project:
    55 Packard

    #2
    I would either look for a video/s on YOUTUBE and/or get an OEM Service Manual (EBAY, maybe??). I consider the other manuals next to useless!!


    "Hope and dignity are two things NO ONE can take away from you - you have to relinquish them on your own" Miamibob

    "NEVER trade your passion for glory"!! Sal "the Bard" (Dear Old Dad!)

    "Cars are for driving - PERIOD! I DON'T TEXT, TWEET OR TWERK!!!!"

    Comment


      #3
      Are you talking about the 02 MGM listed in your signature? If so, do you mean the heater tube that runs from the back of the water pump underneath the intake manifold to the heater hose? Those tubes can develop corrosion holes. Also, do you still have the original intake manifold with the plastic coolant crossover on the front? If so (and perhaps even if not), the part of the intake manifold where the other heater hose goes could also be the source of a leak. If you still have the original intake manifold, you should replace the whole thing with one that has an aluminum coolant crossover no matter what. The standard replacement would have gaskets already incorporated into it, so I'm guessing yours hasn't been replaced yet if you only changed the gasket.

      Originally posted by miamibob View Post
      ... I consider the other manuals next to useless!!
      "next to useless" might be a little extreme, but close enough. What really gets me is that the people who make those manuals seem to have no idea about what you really need to know. You always have to supplement with another source.

      2000 Grand Marquis LS HPP, a hand-me-down in 2008 with 128,000 km; 175,000 km as of July 2014
      mods: air filter box 'tuba', headlight relay harness, J-mod (around 186,350 km), 70mm throttle body, KYB Gas-A-Just shocks, aluminum driveshaft, ARA3 PCM

      Comment


        #4
        yes, I am referring to the 02 GM in my profile....I had to search hard and long to find out how to change the oil filter bypass gasket...and somewhere in that search I ran across the symptoms of my coolant leak meant that the intake hose for the heater core is leaking by..... that hose is about 6" long and preformed with a 90 elbow..and the ends are different sizes...as for having the plastic cross over or aluminum cross-over...I have no idea...yet........ but judging from you post...I have the plastic one...the leak runs down the back of the engine and only when running...there are no leaks up front...I have checked all accessible hoses very carefully and the water pump as well
        In theory, there is no difference between practice and theory, In practice there is.....


        My Rides:

        01 F-150
        02 MGM

        My Project:
        55 Packard

        Comment


          #5
          I'd be guessing it's something that the hose is connected to rather than the hose itself, but anything's possible. Here's a link for a thread dealing with an intake manifold replacement:

          http://www.grandmarq.net/vb/showthre...l=1#post742628

          It includes other links that should be helpful. Updates and requests for further information are always welcome.

          P.S. I tend to watch videos at high speed to get through them quicker. The ones on YouTube usually have a speed setting under the gear symbol.
          Last edited by IPreferDIY; 03-03-2015, 12:24 AM.

          2000 Grand Marquis LS HPP, a hand-me-down in 2008 with 128,000 km; 175,000 km as of July 2014
          mods: air filter box 'tuba', headlight relay harness, J-mod (around 186,350 km), 70mm throttle body, KYB Gas-A-Just shocks, aluminum driveshaft, ARA3 PCM

          Comment


            #6
            I was just looking through that thread and realized that your 02 would probably already have an upgraded intake manifold that would probably not have the gaskets incorporated into it. (AFAIK, they changed the intake manifolds in 01. I was thinking 03.) The aluminum part across the front is the key thing.

            2000 Grand Marquis LS HPP, a hand-me-down in 2008 with 128,000 km; 175,000 km as of July 2014
            mods: air filter box 'tuba', headlight relay harness, J-mod (around 186,350 km), 70mm throttle body, KYB Gas-A-Just shocks, aluminum driveshaft, ARA3 PCM

            Comment


              #7
              yeah..mines aluminum, fun times this week-end....my '55 Packard is sooooo much simpler....
              In theory, there is no difference between practice and theory, In practice there is.....


              My Rides:

              01 F-150
              02 MGM

              My Project:
              55 Packard

              Comment


                #8
                I went at it today full bore...and I realized something...yes I have the upgraded manifold....but when I had a mis-fire in #8 about 4 years ago and oil in the hole....I replaced the upper intake manifold gaskets...not knowing that this manifold doesn't require them....(there were gaskets present when I pulled the manifold off, and naturally replaced them) but I have coolant in the hole now...and have to replace the boots.....so...another two weeks to buy more parts....my question is this...should I inspect the the O-ring gaskets on the intake manifold and just remount the intake manifold....or err on the side of caution and just order a replacement manifold and start fresh?
                In theory, there is no difference between practice and theory, In practice there is.....


                My Rides:

                01 F-150
                02 MGM

                My Project:
                55 Packard

                Comment


                  #9
                  Just to be on the safe side, I'll point out that I've only worked on my 2000, so I don't have first-hand experience with a 2001.

                  I found the following link that indicates some 01's had all plastic intake manifolds:

                  http://www.crownvic.net/ubbthreads/u...87741&page=all

                  There's a photo about halfway down that thread showing the gasket strips for manifolds that do not have the gaskets incorporated.

                  It sounds like you had such gasket strips when you took off the old manifold, and then included new gasket strips even though the replacement manifold already had its own incorporated gaskets. Is this right?

                  Also, when you say oil in the hole, do you mean the spark plug holes? And could it be coolant rather than oil? I had coolant accumulate in one or two of my spark plug holes, but it wasn't obvious to me that it was actually coolant until I discovered the source of the leak.

                  It's basically a judgement call as to whether to replace the gaskets or not. Replacing them would be the safest bet. You should be able to get a kit with just the gaskets so you don't have to replace the whole manifold. If you go that route, make sure you inspect the manifold carefully first to ensure that no cracks or other defects have developed. Even the ones with the aluminum crossovers can develop problems because they still have a layer of plastic under them. Also, the part that the heater hose connects to might be plastic and can develop cracks.

                  2000 Grand Marquis LS HPP, a hand-me-down in 2008 with 128,000 km; 175,000 km as of July 2014
                  mods: air filter box 'tuba', headlight relay harness, J-mod (around 186,350 km), 70mm throttle body, KYB Gas-A-Just shocks, aluminum driveshaft, ARA3 PCM

                  Comment


                    #10
                    Sounds like you have the Dorman manifold.
                    I just bought an intake manifold gasket kit from rockauto for $26.
                    No need to order from the dealer for common maintenance parts.
                    Plus, use the discount; RockAuto sponsors GMN.

                    -ryan s.
                    08 Lincoln Navigator L - 233k
                    03 Mercury Marauder- 63k
                    97 Ford Crown Victoria HPP "Tank of Justice III" (TOJ3) - 194k -->578.9 miles on ONE tank of gas<--
                    94 BMW 325i Convertible - 135k
                    73 VW Super Beetle "Bunky" <----- Wifey's
                    12 Mini Cooper S - 90k <---- Wifey's
                    Originally posted by pantera77
                    Well my buddy tells him he knows exactly who loves buying shitboxes.

                    Comment


                      #11
                      Ok , been doing more research...the manifold is the upgraded OEM manifold, not the Dorman manifold, so gaskets are required. The leak appears to be coming from the thermostat housing where the bottom of the manifold and the housing meet, if this isn't repairable, O'Riely's has a Dorman in stock that I can get for about $175. and yes when I said coolant in the hole, I was referring to the spark plug hole, so now I have spark plug boots to replace as well- now if I can just get that bracket in the back off....it has no purpose but to hold a retainer clip for the throttle body cables..it's going to make a great fishing weight. I didn't replace the manifold- just the gasket strips- I had no Idea 4 years ago about the different manifolds- but it appears that I did everything correctly.
                      In theory, there is no difference between practice and theory, In practice there is.....


                      My Rides:

                      01 F-150
                      02 MGM

                      My Project:
                      55 Packard

                      Comment


                        #12
                        there should be an O-ring on the thermostat that can be replaced. It's different than the one that comes with the tstat. the two bolts that hold the housing on come right out, but you HAVE to put them back with no more than 15 ft-lbs of torque or you risk breaking stuff. the o-ring should be on top of the tstat.

                        Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
                        rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
                        Originally posted by gadget73
                        ... and it should all work like magic and unicorns and stuff.
                        Originally posted by dmccaig
                        Overhead, some poor bastards are flying in airplanes.

                        Comment


                          #13
                          Originally posted by sonar_91 View Post
                          Ok , been doing more research...the manifold is the upgraded OEM manifold, not the Dorman manifold, so gaskets are required. The leak appears to be coming from the thermostat housing where the bottom of the manifold and the housing meet, if this isn't repairable, O'Riely's has a Dorman in stock that I can get for about $175. and yes when I said coolant in the hole, I was referring to the spark plug hole, so now I have spark plug boots to replace as well- now if I can just get that bracket in the back off....it has no purpose but to hold a retainer clip for the throttle body cables..it's going to make a great fishing weight. I didn't replace the manifold- just the gasket strips- I had no Idea 4 years ago about the different manifolds- but it appears that I did everything correctly.
                          It sounds like you're talking about the plastic part of the manifold under the aluminum. There should be a gasket between the plastic and the aluminum. There might be bolts securing the plastic to the aluminum, but I doubt they sell that gasket as a separate unit (though maybe one of the gaskets in the Dorman gasket kit might be the right size). Another possibility is that the plastic under the aluminum might be cracked, in which case you'd probably have to replace the entire manifold.

                          You should be able to get away with just cleaning the spark plug boots. They come off the coil, so you can clean them separately, and make sure the metal conductor spring-looking thing is clean too. You can also buy the boots separately if you don't want to reuse them. Put dielectric grease around the lip of the boots where they contact the spark plugs to provide a bit of a barrier and to prevent the boots from sticking to the spark plugs.

                          If you mean the bracket that covers the corner of the fuel rail on the driver's side at the back, it's actually a crash bracket to prevent damage to the fuel rail in a serious crash. I've seen at least one person claim they could get it off without taking off the windshield wiper motor housing, but I didn't see an easy way of doing that so I took the housing off. Big PITA. Some people cut the bracket in half so they don't have to bother with the rear nut/stud, but that defeats the safety purpose.

                          2000 Grand Marquis LS HPP, a hand-me-down in 2008 with 128,000 km; 175,000 km as of July 2014
                          mods: air filter box 'tuba', headlight relay harness, J-mod (around 186,350 km), 70mm throttle body, KYB Gas-A-Just shocks, aluminum driveshaft, ARA3 PCM

                          Comment


                            #14
                            those bolts that hold the plastic to the aluminum part are just for positioning. they don't provide the sealing pressure. the bolts on the t-stat housing do that. may just need a snug in that case.

                            Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
                            rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
                            Originally posted by gadget73
                            ... and it should all work like magic and unicorns and stuff.
                            Originally posted by dmccaig
                            Overhead, some poor bastards are flying in airplanes.

                            Comment


                              #15
                              so here is the the area I think the leak is coming from sorry cannot add a call out...but it is where the tstat housing meets the plastic part that mates with the block...


                              Click image for larger version

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                              Last edited by sonar_91; 03-08-2015, 08:05 PM.
                              In theory, there is no difference between practice and theory, In practice there is.....


                              My Rides:

                              01 F-150
                              02 MGM

                              My Project:
                              55 Packard

                              Comment

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