4wheel drive problem

Asked by Feb 09, 2014 at 11:01 AM about the 1994 GMC Sierra 2500

Question type: Maintenance & Repair

I have a problem with my 4wheeldrive not
engaging at the front axil. The transfercase is
working. I know there is an actuator but im
wondering if there is a problem caused by the
previous owner modification to the heater
system. There is a manual shutoff valve
installed in the hotwater hose. Also there is a
30amp fuse in the 4x4 fuse socket. The lable on
the fuse box says 25amp. Anyway, any thougt
as to what I should search for

1 Answer

10,705

The '94 has the thermal actuator in the front end. They are slow and they do fail. It probably kept poping the fuse while it was on it's last leg. The last one I bough was about $180 bucks. They are very easy to change and thats were I would start. I think a 15" cresent wrench fits on it. Just un-plug and thread out. If your on level ground the front diff fluid should not leak out. You can pull and test the old one to see if its the problem before you buy a new one. You never know if there is wiring damage. I use a fuse holder. I strip both ends, twist and tin them (cover them with solder so they are like a probe) do it to a scrap wire also. The plug should only have 2 pins. Cannot remember the colors. Would assume the black is ground. Use a 20/5 amp fuse and probe the + and - from your battery. It will S......L.....O......W.....L....Y extend if it's good. Takes 8 to 20 seconds usually. If it doesn't move replace. Dielectric grease in the elec connectors on re assembly helps keep the moisture out.

1 of 1 people found this helpful.

Your Answer

GMC Sierra 2500 Experts

  • #1
    Rowefast
    Reputation
    160
  • #2
    tennisshoes
    Reputation
    90
  • #3
    JOHNG123
    Reputation
    60
View All

Related Models For Sale

Used GMC Sierra 1500
874 Great Deals out of 65,553 listings starting at $2,495
Used Dodge Ram 2500
162 Great Deals out of 4,994 listings starting at $2,499
Used Ford F-150
2,317 Great Deals out of 184,577 listings starting at $699
Used Ford F-250
468 listings starting at $6,694
Used GMC Sierra 3500
8 Great Deals out of 239 listings starting at $6,995
Used Chevrolet C/K 2500
199 listings starting at $2,598
Used Dodge Ram 1500
356 Great Deals out of 10,908 listings starting at $1,500

Used Cars For Sale

2004 GMC Sierra 2500 For Sale
3 Great Deals out of 29 listings starting at $3,900
2000 GMC Sierra 2500 For Sale
37 listings starting at $3,495
1999 GMC Sierra 2500 For Sale
6 listings starting at $6,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.