Easy way to check for compression entering the cooling system is drop the end of the overflow hose in a cup of water with the engine idling. You'll see a constant trail of bubbles coming from the hose end.
You don't have to borrow any pressure tester, and you'll find out almost instantly.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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