GM Truck Club
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 3 of 3
  1. #1

    Default 1990 2500 V Suburban 6.2 questions.

    Hi, I have a couple pretty easy questions on the 1990 2500V 6.2 diesel GMC suburban I just got.

    How much coolant does it take?

    What would be some key places to inspect for damage or common parts to replace? (It has just over 200,000 showing on the odometer but the previous owner said it has a newer rebuilt engine in it, but not sire exactly how old or how many miles).

    Right now the heater wont turn on and I am not sure exactly what the problem could be.

    The radio isn't working (already replaced the fuse and had no luck with just a simple repair, same with the heater)

    Any ideas on where to start on troubleshooting?

  2. #2
    Jr. Engineer Jamm3r's Avatar
    Join Date
    Dec 2012
    Minneapolis area


    Congratulations, the era of the diesel 'burbs is one many of us miss, and you have one of the last ones made. I passed my driving test in a 1979 'burb which had the same body style and many of the same parts.

    Places to inspect aren't much different than any other car or truck for the most part. If you have the rear heat-A/C check the lines going back there for corrosion. Beyond that, belts, hoses, front end, shocks -- the usual wear items on any car.

    GM trucks of this era were prone to failures of the heater fan switch and connector so check there first for your heater problem. The whole thing melts and turns into a glob of plastic goo -- usually have to replace both the switch and connector to clear it up. Newer trucks used relays and don't have the problem.

    If it's the stock radio your best bet is to replace it with aftermarket. If your budget is tight you can get a nice aftermarket radio with a CD player at any junkyard for $20 or so.
    Minneapolis area - 1997 K2500 regular cab long bed + 8.5' Western Unimount plow + modified transmission + 2nd battery + modified camper charge circuit + 1971 Cayo camper -and- 2004 4x4 Suburban 2500 8.1 + Maxbrake controller + 2nd battery + modified trailer charge circuit + Reese receiver, pulls 30' Airstream trailer

  3. #3


    Good to know! It'snot the stock radio but i did notice the power wire was unhooked that might just be the problem there. Ill be checking it out more in the morning. I think the guy I got it from had a better after market system in there and just took it out before trading it to me. It also looks like it has had some fleet truck history or one of the previous owners had a CB or something because I am seeing some light switches and radio mounts that were added since. Great rig so far thought. Once I switched out the fuses that solved about half the electrical problems.

Similar Threads

  1. 1990 Suburban 2500 4x4
    By NickRR in forum GM Vehicle Classifieds
    Replies: 0
    Last: 11-09-2012, 01:05 PM
  2. 1990 GMC Suburban 2500
    By 1990Suburban in forum Member Introductions
    Replies: 18
    Last: 10-14-2010, 03:10 PM
  3. 1990 Suburban 2500 to keep or not to keep?
    By 90Batwagon in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 17
    Last: 04-09-2010, 05:58 PM
  4. 1990 k2500 transmission questions
    By bullit70 in forum GM Powertrain
    Replies: 1
    Last: 11-02-2009, 08:16 AM
  5. 1986 Suburban 2500 Questions
    By santori1 in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 3
    Last: 10-26-2007, 04:32 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts