Recent content by LanceLyons

  1. L

    2001 Tahoe Reverse Flow cooling system

    Today i took the tahoe for a drive and it was doing fine but then after sitting in parking lot for 5 minutes with the truck running it suddenly was over heating. I thought I might be able to get the vehicle rolling down the road and it would start cooling but it didnt. It got to the point I...
  2. L

    2001 Tahoe Reverse Flow cooling system

    I did exactly this covering some 70 percent of the radiator while it was running. The Truck never overheated. I waited some 20 min and it never overheated. I also did not hear any change on the fan or fan speed when it arrived at high temp. It continued spinning at the same rate. Again...
  3. L

    2001 Tahoe Reverse Flow cooling system

    Yep agreed. Its a 2001 tahoe and does have the heads that are known to crack / leak however it runs well so I dont think that is an issue and we have never seen any kind of oil in the coolant or coolant in the oil. Im guess the tool wasnt great since it was a loaner from Reillys auto parts...
  4. L

    2001 Tahoe Reverse Flow cooling system

    Thanks everybody for the replies. I have a good place to start. Fan / radiator.
  5. L

    2001 Tahoe Reverse Flow cooling system

    i did pressure test the system to 15 psi and only noticed a 1 psi drop off in a hour. I assumed this might be the tester since i have never noticed any leaks. I did notice that hot water doesnt seem to make it to the heater core well because heat doesnt come out on full heat.. The heater...
  6. L

    2001 Tahoe Reverse Flow cooling system

    Good questions. I will try the flan clutch thing to see what that does. That is the first time I heard that the clutch engages at higher temps. I am not sure how it would know that since its mechanical but I can certainly try. I have never really noticed a roar from the fan. It spins and...
  7. L

    2001 Tahoe Reverse Flow cooling system

    on the fan, this fan is directly on the belt system. I was told to test this, just look for how much slip or how much resistance the clutch provides. If the fan spins freely then it needs to be replaced but if it resists then its probably ok. In my case when I try to spin the fan it quits...
  8. L

    2001 Tahoe Reverse Flow cooling system

    So i am not completely following. When I pulled the radiator and flushed it with a garden hose from the top and it came out the bottom just as fast as going in. I assumed that meant it was able to flow ok. Am I wrong on that? what do you mean about the flow from radiator to reservoir. how...
  9. L

    2001 Tahoe Reverse Flow cooling system

    Hi, I replaced the water pump on the tahoe probably 5 years ago. There is no leaks around the pump so unless it broke the impeller inside, I would think its ok. I just dont know how to test the flow. I really dont feel much flow inside the upper hose. I have disconnected the upper hose...
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    2001 Tahoe Reverse Flow cooling system

    First thanks guys.. Much appreciated. I thought that it was too simple that adding into the upper hose was a temporary situation. I drove it around a bit more this weekend and it did fine until I idled in a parking lot for about 10 minutes and the temp pegged out. I will say that I...
  11. L

    2001 Tahoe Reverse Flow cooling system

    I agree but taking off the top hose to get coolant into the system doesnt seem like a good design. How do you normally get the coolant into the motor after flushing and draining? I understand they say put in reservoir and run with the cap off a little and repeat but I did that more than a...
  12. L

    2001 Tahoe Reverse Flow cooling system

    Hi, I think my tahoe has a reverse flow kooling system. The thermostat is on the lower radiator line. after flushing, draining, and cleaning radiator, toping it back off with dexcool, burping ,etc I noticed that the engine would heat up to 190 (tsat temp) and hold for a minute before...
  13. L

    2001 tahoe 4.8l coolant flow / over heating

    Do the 2001 Chevy Tahoe's have a reverse flow... that is heated coolant goes into the bottom of he radiator and out of he top? One thing I noticed today while looking at it more. I pulled the upper hose off the radiator and decided to add coolant mix straight into the upper hose and let it...
  14. L

    2001 tahoe 4.8l coolant flow / over heating

    The thermostat is an integrated piece so it cant be backwards. I did flush the radiator and actually pulled it out and cleaned / ran hose water through the top and noticed good flow out the bottom. Assuming this means its not clogged up. Are the 2001 tahoes a reverse flow system. Does it...
  15. L

    2001 tahoe 4.8l coolant flow / over heating

    Is there a way to make sure i have enough flow of coolant? Can a water pump be broke and not leaking? How much should a thermostat open at temperature? My sons 2001 tahoe is overheats in a wierd way. It goes up to the 190 range for the thermostat and hangs there for about 30 seconds and then...
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