2000 Blazer won't go into 4WD....Help !!

[Alexxn 00 Si]

Hello all, My 200 Blazer won't go into 4 WD now for some reason....the other day a dash light came on that said "Service 4WD" and since then if I press either the Auto 4WD or the 4Hi buttons they just blink on and off and it never goes in. Does anyone have any idea if this is a common problem with an easy fix ? We're getting snow this weekend and my dealer appointment isn't until Monday so I'd like to fix it myself.

Thanks !

[eveo529]

I belive it works off of vacume, check under the trammison and aroud it for any disconnected lines or elect. connections? Good Luck.

[autoengine]

I was having the same problem with my 97 Blazer. The vacuum switch located on top of the transfer case was shot. It has three small vacuum lines on the receiving end and the other end has a ball bearing that gets worn out. $15-$30 for the part (I paid $30 but noticed others in this forum have only paid $15. I'm now having problems with the dashboard controls, but the vacuum switch needed to be replaced regardless.

[intimida]

they are known for the vacum switches and also the mode switch on the dash.

[Alexxn 00 Si]

Originally Posted by intimida

they are known for the vacum switches and also the mode switch on the dash.

Where is this vacuum switch everyone is talking about ? I was just under my Blazer and all I see on the front axle towards the passenger side tube is a bolted on plate (looks like some sort of actuator) with a screwed in switch and 2 wire connector, and a cable that runs up under the battery tray. ?????

[70D]

Have you tryed reseting the computor by unhooking the battery for 5 min. I don't know what this doe's but when I do this on My 92 the four wheel drive will go onto four high Old fart told me to do this it works

[autoengine]

The vacuum switch is located on top of the transfer case, so you can't actually see it, but rather you have to reach around from underneath. On my model (1997) the 4wd transfer case closer to the driver side of the vehicle -- almost directly below the where the right leg would be if you were driving, if it helps to think of it in those terms.

It's a somewhat cumbersome fix because of the lack of wiggle room. I had so little room that I was unable to get enough leverage to work a socket wrench so I removed the driver seat, pealed away the carpet and drilled a hole just in front of the seat bolt and to the right by the stick shift to get at it.

[Alexxn 00 Si]

Originally Posted by 70D

Have you tryed reseting the computor by unhooking the battery for 5 min. I don't know what this doe's but when I do this on My 92 the four wheel drive will go onto four high Old fart told me to do this it works

Yep already tried that, no luck....it's going to the dealer tomorrow (extended warranty).....let them worry about it.

[Alexxn 00 Si]

Just got my Blazer back.......for all who said vacuum switch......Ding !Ding ! Ding ! .....we have a winner !!!!

[2000Blazer]

Originally Posted by Alexxn 00 Si

Just got my Blazer back.......for all who said vacuum switch......Ding !Ding ! Ding ! .....we have a winner !!!!

Question.... How much did this little job cost you? I am having the EXACT same problem and want to be prepared for the damage...;o)

[Alexxn 00 Si]

Originally Posted by 2000Blazer

Question.... How much did this little job cost you? I am having the EXACT same problem and want to be prepared for the damage...;o)

I have a warranty with a $100 deductable.....from what I was told the part lists for roughly $75 and 1.5 hrs labor......hth

[rstroud]

I replaced the vacuum switch on my 1991 a couple of weeks ago. I had to go to a dealership to get it. It cost $33.00 and takes 5 minutes ot replace. A bit tough to get to, but I wouldn't have paid anyone $100.00!!! What kind of warranty has this deductible? Extended warranties are always a rip off!

[Alexxn 00 Si]

Originally Posted by rstroud

I replaced the vacuum switch on my 1991 a couple of weeks ago. I had to go to a dealership to get it. It cost $33.00 and takes 5 minutes ot replace. A bit tough to get to, but I wouldn't have paid anyone $100.00!!! What kind of warranty has this deductible? Extended warranties are always a rip off!

The kind that you pay only $35 when you buy a used private vehicle to transfer it over......seriously I know how to do my own work, but it was going in for some other things that I didn't care to do myself....

[ikus]

a 2000 blazer does not have a vacume switch on the transfercase
it is on the firewall above the coil,, check to make sure the line does
not have a hole in it,, then on the right kick panel when you hit the button do you here a click??