Recent content by Modoyadney

  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...
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