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  1. M

    Coolant Leak 1999 5.7

    I have poured it in yesterday following the instructions. 24 hours later there was no new coolant on the ground. I have cleaned everything thoroughly and keep an eye on it. So far it seems like it has worked. :thumbsup:
  2. M

    Coolant Leak 1999 5.7

    I came to the conclusion, that there is definitely a waterleak between the cylinder head and engine block on the passenger side. I'm not sure if there something wrong with the intake manifold gasket, didn't find anything here. I could take a look in one of the cylinders on the passenger side...
  3. M

    Coolant Leak 1999 5.7

    After quite a while I have had finally time again, to take a closer look this this again. I found one leak at the coolant reservior. This could be easily fixed by cutting a small piece of the hose and installing a new hose clamp. Unfortunately this was not the leak that leads to the coolant...
  4. M

    Coolant Leak 1999 5.7

    I took a closer look on it again today. Everything around the intake and the heater hoses looked and felt dry. It is just a little wet between the head and block. I dried it off with some brake clean and a towel and check again after driving tomorrow. If it gets worse, I might try a bottle of...
  5. M

    Coolant Leak 1999 5.7

    Hello guys, For some time I've noticed a very slight loss of coolant. Today I decided to take a closer look and I noticed a drop of coolant on the starter motor. I took a closer look with a mirror and I suspect a little leak between the cylinder head and the block right above the starter motor...
  6. M

    A/C not working. Clutch is not engaging

    I guess I'll have to add this to my to-do list, since I don't have the equipment to evacuate the refrigerant without loosing it. But I forgot to mention that I replaced the orifice tube as well, since it was included within the new A/C line. I didn't flush the evaporator, because I thought if...
  7. M

    A/C not working. Clutch is not engaging

    Hi, Thanks for your help. I managed to find the problem. It seems like one of the previous owners has messed with the system. Thats probably why the sensor was missing on the old compressor as well. I found the cable and connector tucked between the valve cover and intake. Right now I used a...
  8. M

    A/C not working. Clutch is not engaging

    The truck is a 99 Suburban, forgot to mention that. I tried to follow the wiring from the HVAC control module on. But the A/C High Pressure Switch is nowhere to be found on my system. The manual states it's supposed to be on the backside of the compressor. My new replacement compressor nor the...
  9. M

    A/C not working. Clutch is not engaging

    Hi, After fixing the problem with my rear O2 sensors, I wanted to bring the A/C back to live, especially now in the summer... The old compressor was stuck, so I installed a new compressor, new A/C lines, new condenser and a new drier last weekend. I filled it up today, but when pressing the...
  10. M

    O2 Sensors no activity

    Hello everyone, weeks later I finally found the fault in the wiring. If anyone has to deal with similar symptoms, it's definitely worth taking a look at the wires of the rear O2 sensors directly underneath the exhaust. They have some kind of heat isolation at this spot. Underneath this...
  11. M

    O2 Sensors no activity

    Thank you for the screenshot :thumbsup: . Thats another approach they didn't mention in the Chevy manual for this error code. If I got the time I'm gonna try it this weekend. The reason I wanna go with a universal cat is not only because it is cheaper, but because I'm from the other side of the...
  12. M

    O2 Sensors no activity

    Yeah, one cat is damaged, might have been just the age. The engine is in a good condition, no oil or coolant consumption or any funny noises or smells. And since the last emissions test was passed the other cat should do its job. I will buy an universal cat and weld it in but I am not sure if...
  13. M

    O2 Sensors no activity

    I did the whole procedure described in the manual today and ended up with ECM replacement... :( What i find very odd, is that the voltage of both rear O2 sensors are stuck at one voltage. Both got exactly the same voltage, 400 and something mV. Even with the O2 sensors disconnected the scan...
  14. M

    O2 Sensors no activity

    Well, I bought these chinese O2 simulators just for fun and installed them. The error "O2 sensor no activity detected" still comes up every once in a while for both banks. So far I have checked all the easy to reach connectors. Nothing suspicious there... At least the simulators seem to do...
  15. M

    O2 Sensors no activity

    Hi, Since I got my truck I get error codes for my O2 Sensors (the ones behind the cats). I have replaced both sensors. After that they at least didn't show any voltage related error codes anymore. After I delete all the errors they usually show up after some driving, sometimes after shorter...
  16. M

    New Wheels for my Suburban - Anybody knows the name/brand?

    Cool, thank you. And yeah, I meant the bolt pattern is 5 x 5" :Big Laugh: They are 8" wide of course.
  17. M

    New Wheels for my Suburban - Anybody knows the name/brand?

    Hey everyone, Since my stock wheels were in really bad condition and I wanted to go up in tire size just a little, I stumbled upon some wheels and got a pretty good deal on them. I really like how they look on the car. Now my question is: Does anyone know the name and/or brand of the wheel...
  18. M

    Transmission humming noise between 40-50 mph

    Yeah, I replaced all bearings and races in the axle. I reused the old pinion shim. Since I didn't have the chance to buy a cheap torque wrench with a scale in the range needed here, I used a rod, measured the length of it and used the yoke bolt holes to attach it. Then I calculated the force...
  19. M

    Transmission humming noise between 40-50 mph

    Everything is put together again. The loud noise is gone, however the diff still makes a little noise on coast sometimes. I can live with the way it is now. If it should be like in a new car, I think you really have to replace everything and need all the fancy measurement tools. I know from now...
  20. M

    Transmission humming noise between 40-50 mph

    I put new wheel bearings in already. The plan was to assemble everything this weekend. Unfortunately the pinion seal that came with the rebuild kit didn't fit... :mad: The old bearings had to be grinded and hammered off the pinion and diff carrier. The new ones came on easy with a regular small...
  21. M

    Transmission humming noise between 40-50 mph

    Actually the bearing didn't even look that bad. The bad race is from the carrier bearing. The two on the pinion look like they are alright. Yet I will still replace all of them, of course. I couldn't see the surface of the races before disassembly, so there was no way to tell just by visual...
  22. M

    Transmission humming noise between 40-50 mph

    One the the races in the dif looked like that. Could this be the source of the problem?! The new bearings will go in next week.
  23. M

    Transmission humming noise between 40-50 mph

    New wheel bearings arrived yetserday, I took everything apart today. Unfortunately the wheel bearings seem to be in a too good shape to cause this noise. So I just ordered the diff rebuild kit which includes all four bearings, new crush sleeve, new pinion nut and a new seal. I really hope...
  24. M

    Transmission humming noise between 40-50 mph

    New u-joints are in. The nosie is still there... Took the brake drums off to have a close look at the play in the rear axle and there is definitely up and down play. I will order new rear wheel bearings and see what happens... Is a little up and down play at the rear wheels normal? Since I will...
  25. M

    Transmission humming noise between 40-50 mph

    I jacked the rear up and checked it in neutral again today and can tell that the pinion yoke definitely has no play at all in any direction. The U-joints, especially at the front have a little play. I will order new one and repalce them. In addition I noticed a couple of other things: The rear...

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