Antifreeze smell under hood but no visable leak

Discussion in 'General Chevy & GM Tech Questions' started by snowd, Oct 13, 2010.

  1. snowd

    snowd New Member

    Ok guys this is what I have; I picked this truck up at an auction a few weeks ago, it has 156,000 miles on it but it runs great. I'm noticing an antifreeze smell from under the hood & I can't seem to find any visable leaks. It does have the red coolant in it, here's the list of stuff I looked at trying to figure this out:

    Starts and warms up fine (stays just under 210), heater works fine too.
    Pass floor dry
    No apparent antifreeze smell in exhaust
    Oil looks normal (oil pressure is at 40 at idle)

    I've read that the 2001 - 2006 5.3's have head problems but considering mine's a 1999 I don't think this is the issue (at least I hope not). Any thoughts?
  2. murdog94

    murdog94 Epic Member 5+ Years 5000 Posts

    Well you may have a faulty Radiator cap, also there is a vent (hence possible bad cap) also if your not using coolant that is where i would start.
    I did have a 2002 that had a clamp fail, and had a slow leak, till i found the broken clamp.
  3. KWG08VMI

    KWG08VMI Rockstar 100 Posts

    I have had a radiator leak that was small enough that the coolant wasn't dripping but once it was hot it would begin to release steam. That's why i could smell it but not see it. might want to try a SMALL amount of stop leak.
  4. Z-71

    Z-71 Rockstar 100 Posts

    I had the same thing happen but mine was the water pump gasket.
  5. Chris Miller

    Chris Miller Rockstar 100 Posts

    I agree with murdog94. It's most likely your radiator cap.
  6. snowd

    snowd New Member

    Thanks guys, I'll start with replacing the coolant recovery tank cap as recommended and report back in a few days. Thanks
  7. kinglt1

    kinglt1 Member

    if thats not the problem check the waterpump... the pump has a small weep hole in the side facing the block.

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