balloon. Your water pump is strong because it is pushing with enough pressure to balloon the hose. Practically speaking, pressure is constant throughout system with a minor gradient resulting from the pump, i.e. pressure is lowest behind the pump. It will be highest just before any blockage. This pressure is transmitted back to the hose and the hose bulges.

You probably dislodged a blockage in the radiator before you saw the temp drop. A new radiator is the proper way to solve the problem. With all components good, your car should run at or just below 1/2 on the highway in the summer. In traffic, the needle should go to 3/4 and with an 89 degree fan switch the fans should kick on. With an 82 fan switch, the fans should kick on just over 1/2 and keep the temp there. The problem with a 82 fan switch is that the fans will run more often(duty cycle) and wear out sooner, especially if you have a turbo with a delco fan. I fully agree with KevinK's opinion on fan switches that 89 is better. One last item, the temp gauge will read lower if the temp sender threads at the head are corroded or the ground to the meter is weak.

posted by 216.75.9...

• Important hint on overheating / running hot, mikem, Tue, 30 Jul 2002 00:52:41
  • Re: 3/4 is normal with A/C OFF, JohnK, Wed, 31 Jul 2002 10:19:56
    • Re: 3/4 is normal with A/C OFF, mikem, Thu, 1 Aug 2002 19:30:32
  • Re: Important hint on overheating / running hot, JimK, Wed, 31 Jul 2002 00:47:57
  • You really cant say that 3/4ths guage is bad unless...., AP, Tue, 30 Jul 2002 19:49:53
    • Re: You really cant say that 3/4ths guage is bad unless...., mikem, Tue, 30 Jul 2002 21:01:52
      • Re: You really cant say that 3/4ths guage is bad unless...., Carl, Wed, 31 Jul 2002 20:46:12
      • 3/4 vs engine temp....don't confuse the two., JohnB, Wed, 31 Jul 2002 09:43:04
  • Pressure blockage theory is weak, but hose inner, Bill U, Tue, 30 Jul 2002 13:28:23
    • Re: Pressure blockage theory is weak, but hose inner, mikem, Tue, 30 Jul 2002 19:19:35
  • Re: Pressure blocks in the radiator cause hose to..., JohnK, Tue, 30 Jul 2002 10:55:21 <-- Viewing This Message
  • Baloney., JohnB, Tue, 30 Jul 2002 08:21:06
    • Re: Baloney., bobb, Wed, 31 Jul 2002 03:16:51
    • maybe not?, JimBlake , Tue, 30 Jul 2002 08:44:05
      • That's a 'stretch' (sorry) but plausible., JohnB, Tue, 30 Jul 2002 09:18:11
        • Re: That's a 'stretch' (sorry) but plausible., mikem, Wed, 31 Jul 2002 18:11:41
        • impeller/cavity/erosion happens, JonnyH, Tue, 30 Jul 2002 13:08:35
      • baloney, mikem, Tue, 30 Jul 2002 09:02:45
  • Re: Important hint on overheating / running hot, KB88900T, Tue, 30 Jul 2002 01:15:54
    • Forgot to mention., KB88900T, Tue, 30 Jul 2002 01:27:44
      • RE: BOTH cooling fans..., Wally Kniaz, Tue, 30 Jul 2002 19:14:32
        • what year?, JimBlake , Wed, 31 Jul 2002 07:46:38
          • Re: what year?, Wally Kniaz, Wed, 31 Jul 2002 13:18:52
        • Re: RE: BOTH cooling fans..., KB88900T, Tue, 30 Jul 2002 23:02:49
      • Re: Forgot to mention., mikem, Tue, 30 Jul 2002 03:22:31
        • What about replacing radiator?, KB88900T, Tue, 30 Jul 2002 23:09:55

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