cooling system

  1. Obs-

    Coolant leak

    I have a 1988 K1500 with the 350 TBI and ive had a coolant leak that would drip around the starter area. I would top it off but so it would stay level. 2 days ago i was driving then my temp spiked so i pulled over and turned off my truck . my trucks idle didnt sound weird no knocks to odd noises...
  2. T

    Brown Paste in cooling system?

    Hi everyone, I recently got my radiator in my '93 K2500 Sub 454 replaced (about 2-3 months ago). Popped the radiator cap today to check coolant level and noticed this nasty brown paste around the fill neck. Any clues as to what it is?
  3. T

    Cooling System Issues?

    Hi everyone, I just had the radiator in my '93 L19 Suburban replaced by a local shop, and as I've been daily driving it the past couple days (abt 4.5 mi, mostly uphill) , I noticed the truck now consistently runs at 140-160. Before I had the radiator replaced, it would always run at around...
  4. Victory Red

    2000 K2500 HD cooling system upgrade

    Hi ! I’ve got a 2000 K2500 HD 5.7 with tow package. I plan to do a lot of heavy hauling in it, and I believe it has the stock radiator, and want something that could handle a nice working load to replace it with, I’m not familiar on the possible cooling system upgrades/replacements out there...
    • Victory Red
    • Thread
    • cooling 5.7 radiator cooling system towing
    • Replies: 23
    • Forum: Towing
  5. westcoastZ71

    Heater blows cold

    Hey yall, my 1995 K1500's heat doesn't work at the moment and I'm not sure why. The heater core is fine, the blend door actuator seems to be working properly, and the truck doesn't have any other coolant system issues. Really hoping to get this dealt with before the weather gets too cold, has...
  6. JBis

    My experience with ECP radiator

    I was looking for a full aluminum radiator for my 2000 c3500 service truck… ECP radiator was mentioned and they appeared to be knowledgeable. My first radiator showed up Christmas week, the oil cooler threads were damaged, making the radiator unusable. They promptly sent a return label and...
  7. hilly101111111

    Large Radiator Option

    Goodmorning all. Im looking to upgrade to the larger radiator size in my 1990 GMC k2500/ TBI 350/ Turbo 400 Trans Im hopeing some of you guys and give my the list of what I need for the Upgrade. Since I have a regular 350 that's "low deck" what fan shroud fits and will the larger radiator fit...
  8. hilly101111111

    Cooling/Radiator/Over Pressure

    My truck is a 1990 GMC k2500 with a TBI 350 I have a few questions for you guys. Long story short I replaced my radiator for the 3rd time because it's a cheap Chinese one and I can get them for free under warranty. The Pressure blew out the cheap plastic drain plug. Anyway I also replaced my...
  9. Hunter 21

    Electronic water pump vs mechanical water pump

    My clutch fan hub came off my water pump today and put a nasty gash in my radiator, while getting ready to order parts I’ve pondered the idea of switching from a belt driven water pump with fan to an electronic water pump and twin electric fans. Does anyone have any experience with a set up like...
  10. T

    1996 C1500 with 5.7 Vortec Running Cold

    Hi I've got a 1996 c1500 with 5.7 Vortec and about a month ago the thermostat got stuck closed and it was overheating and then I replaced the thermostat with a stock 195° Thermostat and now my motor will warm up to the 195-200 then the thermostat will open then it stays at around 155° and no...
  11. sethturbo

    Thermostat Fitment

    Hi all this is my first post and i’m having some thermostat fitment issues, i have a 93 k1500 truck with a non vortec 5.7. and i’ve tried multiple thermostats and thermostat gaskets from autozone and advanced auto, and with no avail every single one of them move around within the little circle...
  12. KCusick81

    Cooling system flush questions

    Hey everybody, So after an arduous few weeks of burning the candle at both ends, working 10-12 hour days, prepping my house to go on the market, waiting for parts and fighting daylight, I've finally completed the install portion of my repairs. Today I began the process of flushing the cooling...
  13. chriscg

    Fan clutch use and advice.

    Maybe this should be in the stupid questions thread. But im nut sure. Jut lookng for some peace of mind. My fan clutch comes on a soon as you take off after starting and howls like crazy. It goes away after a minute or two. if I'm using my ac it will howl after every stop sometimes, then go...
  14. McSweeney

    Weird cooling system cool down vortec 5.0

    I have a 1997 c1500 5.0 vortec and after running the truck and shutting it down i get bubbles in the reservoir from the overflow hose from the rad. It only happens when the truck shuts down, and i dont actually lose any fluid. Its almost like a quarter of a quart just pushes back out of he...
  15. Angelo

    No radiator cap on 1996 6.5L. How to drain and how to fill

    Probably a dumb question. I read that this must be a fully pressurized cooling system since there is no radiator cap on either side, only at the overflow reservoir. What would be the procedure to refill with coolant? I see a bleeder valve at the top of the radiator hose. Do I turn out the...
  16. Angelo

    1996 6.5L K3500 thermostat swap from 195 to 190 height/length question

    My truck gets to close to 210 (temperature) on the highway. It has a single thermostat. I pulled it out and it is a 195. I was looking to swap that to a 190. The gasket was in bad condition anyways, so doesn't hurt to do this now. I realize it may still reach close to 210 once open, this is more...
  17. R

    '91 350 TBI cooling system weirdness

    Changed thermostat and hoses, trying to bleed the cooling system with a spill free funnel (already tried with just the rad cap off on ramps, same result). Anyone have an idea of what's going on?D have much experience bleeding cooling systems, not sure if this is normal. First video is idle with...

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