Tahoe Leaking Coolant

Discussion in 'General Chevy & GM Tech Questions' started by Conlan Rose, Dec 5, 2012.

  1. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts

    New ones won't hurt at all, good insurance.

    You can usually tell the condition by feel, a new hose will be firm through out it's length a questionable hose will feel soft and mushy.
  2. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    Here's the pics after I removed the shroud. I also took pics around the water pump because I cant tell if it may also have a leak from a gasket. All new parts minus the radiator will be AC Delco. Well bringing it to operating temp the truck didn't start cooling its self until after 210 so I think the thermometer is done.

    2012-12-06_14-58-09_704.jpg 2012-12-06_14-57-04_189.jpg 2012-12-06_14-57-09_824.jpg 2012-12-06_14-57-18_277.jpg 2012-12-06_14-57-28_636.jpg 2012-12-06_14-57-36_987.jpg 2012-12-06_14-57-41_370.jpg 2012-12-06_14-57-44_170.jpg 2012-12-06_14-57-54_529.jpg 2012-12-06_14-57-59_830.jpg 2012-12-06_14-58-06_68.jpg

    - - - Updated - - -

    They all feel firm very firm and they are factory AC Delco. I'm very impressed. To be honest having many problems while approaching a major maintenance interval isn't bad. Currently at 197,500+ miles.
  3. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts

    There is some rust around the water pump, but (from here) it looks dry, the wet areas seem to be around the rad.

    That rad looks like it's still in good shape, but (unlike the old copper) if it's leaking, it can't be fixed
  4. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    I don't have a problem replacing it because it is easy to do and heck I get a new part out of it. There is surface rust on the water pump, but it still looks solid. It looked damp but might just be the weep hole.
    My total on amazon for parts is $213.82 and free 2 day shipping for all but the radiator.

    Radiator $98.25
    Coolant hose $20.89
    Coolant hose $11.59
    Coolant hose $23.58
    Block heater $17.84
    Radiator cap $11.93
    Coolant temp sensor $14.47
    Thermostat $15.32
    Coolant will be $15.99 a gallon

    Total will be like $265 which isn't bad.
    Last edited: Dec 6, 2012
  5. SurrealOne

    SurrealOne Former Member ROTM Winner 1000 Posts

    I've never done the temp sensor or thermo and don't even know where they live, as I'm somewhat engine stupid. PM me instructions on where to look. I know they go bad and are cheap, so it'd be nice to know where to find the thing, as I'll probably pick up a spare given my 143k miles. :)

    Oh, and when I did my radiator I was shocked at 16 bucks a gallon for unmixed coolant. When the heck did it get so expensive?! (I was appalled at mixed coolant going for 14 bucks a gallon; it's half water!)
  6. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    Well for cheap stuff its 8 a gallon mixed. But for quality coolant it costs a decent amount. I'm not sure where the thermostat is but the coolant sensor on 90's trucks is above the exhaust manifold on the driver side. I have a pic I think.
  7. donyms

    donyms Epic Member 5+ Years ROTM Winner 1000 Posts

    My Mom's 95 Sierra the thermostat is on the engine side of the top radiator hose under the goose-neck that the hose connects to. On mine "2002 Silverado with the 5.3" it is on the engine side but the bottom hose. I hope this helps..... :glasses:
  8. Pikey

    Pikey Moderator Staff Member 5+ Years ROTM Winner 5000 Posts

    Yep, follow the top hose to the motor. You will see the housing there. 15 minute job. Well, with your luck.... nevermind
  9. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    So the fitting that goes in to the engine. I assume I will need a new gasket as well. Only two things are kinda in the way: the throttle cables and the A/C line. So really with flushing, mixing, install and prep this shouldn't take more than 3 hours.

    2012-08-22_19-18-35_11 (1)b.JPG
  10. Pikey

    Pikey Moderator Staff Member 5+ Years ROTM Winner 5000 Posts

    That is it. That is the thermostat housing. Just unbolt it, Make sure that you pay attention to how the old tstat is in you don't want to put the new one in the wrong way, clean up the housing really well, clean up the engine surface well, Put some rtv on both surfaces, a new gasket and bolt it back together. Really should take an hour at most including flushing it. When you have the thermostat out you can run your garden hose thru the radiator. It will flush a lot of the crap out of your motor because no thermostat is holding the water back. After you get clean water coming out, put your new tstat in and refill the radiator with straight coolant. When I worked in the garage we would do the flush until clear water came out of the motor. Then we could drain the radiator and fill it with straight coolant. The Water in the motor will mix with the straight coolant and give you a 50/50 mix.

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