79 cj7 i6 automatic NEED HELP WITH 4x4 VACUUM HOSES
I have a vacuum switch mounted in my glovebox for my 4x4 all my hoses were removed. there is a actuator deal on the end of the transfer case with two vacuum lines. i assume each of those go to a slot on the switch but which one and where does the 3rd hose go??
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Check all your vacuum lines. The smaller vacuum hoses tend to get really soft and gummy. They will collapse when vacuum is present. Look for disconnected hoses and T-fittings. The one that causes the most problems is a large diameter hose that attaches to the vacuum actuator which controls the front differential engagement. The actuator is located underneath the battery tray. You will have to remove the battery and the battery tray to gain access to it. I would recommend that you replace all the vacuum hoses with new ones, even if the old ones seem to be ok. I am assuming the blinking light is for the 4hi and not the 4lo.
i had a similar problem with mine, check to see if you are getting vacuum to the front 4x4 actuator valve under the battery tray, it looks like a big diaphragm with a cable hooked to it. the hose is tied close to the oil dipstick. if the diaphragm sucks in when you have the vehicle started and engage 4x4, then its likely front axle related. but if you get no vacuum at all then check the vacuum pump located on the transfer case. i didnt have the money to replace the vacuum pump so i made me a turn valve under the hood and ran vacuum lines to the intake. just make sure you turn the valve off after you disengage 4x4 or you will use more gas cause the front axle would stay locked in, and may cause more probs down the road. the vacuum pump on the transfer case is about 200 bucks. it cost me 10 dollars for the valves and hoses... hopes this helps.
If your 4x4 Hi lite comes on when switched to that, then it could be a vacuum leak on the front wheel(s). Check the vacuum hose to each wheel for cracks. With the engine running ( apply the emergency brake) turn the wheel left or right you will be able to see a small black hose connected on the back side close to and just above the drive shaft, remove the hose and check for vacuum. If the hoses are OK, then the whole locking mechanism has to be removed, there are O'rings that deteriorate and have to be replaced. It could also be the locking mechanism is froze up with dirt.Try locking unlocking them manually to free them up, do this with the engine off.
there is a vacuum line running to a vacuum switch on one of the hoses try taking the switch out and connecting the hoses together. Thats what turns off the hot water while the air con is on. If that works then its bad or the vacuum line going to it has a problem.