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andrewpapa
Fully Licenced
122 Posts
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 Posted - 22 May 2010 : 11:07:50 PM
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i have water in hoses from gravity but no water is pumping thru hoses ,i have flushed all hoses and water runs thru them but when i have the car running there is no water pressure circulating thru air-con hoses ,heater valve is not blocked water runs thru it. need help thanks
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i am not a licenced mechanic but i do have years off experience fixing and restoring cars and doing them up ,i can even do-motors-up,panel betting,spray painting,electrical work. i know What i am doing when fixing my cars, i am not saying i know everything on how to fix cars but i can fix them with information and help off the internet and this site.vncommador.com |
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Mechknight73
National Driver
1001 Posts
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Posted - 22 May 2010 : 11:52:30 PM
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| The heater valve is a vacuum servo. Is the vacuum lead connected to it ok? |
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andrewpapa
Fully Licenced
122 Posts
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Posted - 23 May 2010 : 12:43:21 AM
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| vacuum lead connected good but i do not think the heater valve is working when i switch from hot to cold the valve dos not move.i think the vacuum lead to the center console switches has come off the heater switch,is this what could be the problem and how do i test this ? |
i am not a licenced mechanic but i do have years off experience fixing and restoring cars and doing them up ,i can even do-motors-up,panel betting,spray painting,electrical work. i know What i am doing when fixing my cars, i am not saying i know everything on how to fix cars but i can fix them with information and help off the internet and this site.vncommador.com |
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Mechknight73
National Driver
1001 Posts
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Posted - 23 May 2010 : 12:45:37 PM
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First of all, get a length of vacuum hose, connect it to the valve, and suck on the end. Don't worry, you won't get a mouthful of coolant. As you suck on the end of the vacuum hose, it should move. If it doesn't, the valve is your problem. These vacuum servo valves often have rubber diaphragms in them, and like anything else made of rubber, it can perish over time. If this is the only problem, ignore everything I mention below.
If you do have a vacuum leak, you should hear a faint hissing inside the cab, and the engine may be running rough. To find out which one is the offender on the heater controls, trace the line back into the cab. It goes from the valve on the hoses, to under the windscreen washer bottle, to a grommet on the firewall.From there, it will link up to something under the dash.
Once you know where the hose comes out, check the whole line for any wear or damage. If there's a leak, it would explain why it doesn't work. You can also use compressed air (very gently) and spray soapy water on it. Leaks will show up as bubbles.
To get at the heater controls, undo the gearshift boot, take off the knob and put it aside. underneath where the shift boot and its surrounding trim was, are three screws. Undo them, and gently pull out the console bin. Disconnect the switches from along the top. They are colour coded, so very hard to mess up. With that aside, open the fuse panel under the dash, and pull out the hinge pin on the L/H side. You will now see a large Phillips screw on the end of a mechanism attached to a rod. This is the heater vent control, and must be disconnected to get at the vacuum switch block. With this undone, remove the control knobs off the fan, vent and heater controls. Undo the screw holding the switch block in, and you now have access to the vacuum lines at the back of the vent controls.There are five different sockets connected to the hoses. Any others behind the console, I haven't seen or know about yet |
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VNSVLE
Forum Moderator
1316 Posts
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Posted - 23 May 2010 : 10:25:51 PM
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SO what you are saying is the heater does not work then?? In regards to the rod that runs from the heater control to the heater box you can just unclip the rod from the mechanism. The vacuum line for the heater tap should be just in front of the mechanism that the rod connects to going into the heater box and is controlled internal of the heater box.
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What's the difference between understeer and oversteer?
Understeer is when the driver is scared.
Oversteer is when the passenger is scared. |
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andrewpapa
Fully Licenced
122 Posts
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Posted - 24 May 2010 : 9:54:26 PM
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| hi thank you for the information i have just loaded this info onto my laptop so i can read the information as i am working on my vn .i have worked on center console be for when i put my cd player in but have forgotten how to do it .thanks for the information ps:/ the heater works and cold air works but not cold cold ,i don't think the heater valve diaphragm is working when i go from hot to cold the valve dos not move,i can move it with my hand and it opens. i have flushed all hoses and the air-con on it own and water runs thru it and the valve and the water pips at the center console get hot when car is running. |
i am not a licenced mechanic but i do have years off experience fixing and restoring cars and doing them up ,i can even do-motors-up,panel betting,spray painting,electrical work. i know What i am doing when fixing my cars, i am not saying i know everything on how to fix cars but i can fix them with information and help off the internet and this site.vncommador.com |
Edited by - andrewpapa on 24 May 2010 9:58:47 PM |
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Mechknight73
National Driver
1001 Posts
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Posted - 24 May 2010 : 11:11:24 PM
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| You can test any vacuum servo valve the way I described, but to get to it would be messy. I could transcribe what the manual says about how to take it apart, but you're not gonna like it. Unless VNSLE and someone else has a short cut, it involves taking apart a lot of the interior to get at it. However, if your other post is right, and you've got it working the way you want it to, then don't bother unless you want it all "factory original." |
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andrewpapa
Fully Licenced
122 Posts
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Posted - 24 May 2010 : 11:33:00 PM
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| i now it is a hard job to pull the center console apart i have don it before but it has been a couple of years since i did it and i have forgotten how to do it. i have a vn v6 greagory repair manual so don't worry about info i have the manual. if i need more help i will post it ,i will try the things that you have suggested and will let you know what has happened. thank you Mechknight73 and VNSVLE for help. |
i am not a licenced mechanic but i do have years off experience fixing and restoring cars and doing them up ,i can even do-motors-up,panel betting,spray painting,electrical work. i know What i am doing when fixing my cars, i am not saying i know everything on how to fix cars but i can fix them with information and help off the internet and this site.vncommador.com |
Edited by - andrewpapa on 24 May 2010 11:54:45 PM |
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VNSVLE
Forum Moderator
1316 Posts
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Posted - 25 May 2010 : 07:45:29 AM
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If the heater is working and the air con is but is not overly cold it could be one of a couple of things. Either gas is low in the a/c or the mechanism the the rod from your heater control connects to has been set up incorrectly thus keeping the heater open slightly and not allowing to cool properly. If you disconnect the rod from the lever turn the a/c to cold as far as it will go and then pull the lever that the rod connects to right back towards the back of the car and then reconnect the rod. This will ensure that when you have it on cold the heater is not open at the same time.
With the car running and the air con on, the hose going into your accumulator (big silver cylinder on passenger firewall) should be cold and have a light coating of fine ice if your a/c is gased and working correctly. If you are careful feel the hoses going into the compressor with the car running also. The low side of the compressor should be cool to touch and the high side will be hot so be careful. Also if you have a look at your receiver/dryer (small black canister behind grill) you will notice a sight glass on top. Have a look at this with the car running and a/c on. If this is very bubbly this means your gas is low and will need to be charged. Depending if your car has had a retro fit to the R134a from the R12 you may need the retro fit before they can do any work on your a/c system unless you can find a shop with a bottle of R12 sitting around. You should have a sticker I think on your left hand strut tower if you have had the retro fit saying that your car can take R134a.
See how you go with that and let us know how you go
Cheers
Wayne |
What's the difference between understeer and oversteer?
Understeer is when the driver is scared.
Oversteer is when the passenger is scared. |
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andrewpapa
Fully Licenced
122 Posts
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Posted - 25 May 2010 : 6:33:31 PM
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| hi i worked on car today i pulled the center console apart and everything is ok there, i tested the heater valve dos not move when i sucked on vacuum hose and the rubber diaphragms is faulty so i need a knew heater valve. thank you Mechknight73 and VNSVLE -i will test all information given to me thanks -heater valve diaphragm is faulty . |
i am not a licenced mechanic but i do have years off experience fixing and restoring cars and doing them up ,i can even do-motors-up,panel betting,spray painting,electrical work. i know What i am doing when fixing my cars, i am not saying i know everything on how to fix cars but i can fix them with information and help off the internet and this site.vncommador.com |
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Mechknight73
National Driver
1001 Posts
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Posted - 26 May 2010 : 3:01:41 PM
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| I haven't the foggiest idea how much one of those vacuum diaphragms costs, but if you have to replace it, don't even toy with the idea of getting one secondhand; it will be Murphy's Law that it will spit the dummy two days after you put it all back together. Having not seen one with my own eyes, I don't know what they look like; If any part of the diaphragm is open to the air, smear a little linseed oil on the rubber parts; it keeps them supple and flexible for longer. Learned this one a long time ago. Pushbike tyres, to keep them new and stop them from perishing on the shelf, are treated with linseed oil. That's what the funny rubbery smell often really is. |
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