Question about 2000 Pontiac Sunfire

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New thermostat,water pump,alternator.battery,head gasket i can drive the car ror 15 miles i hear water sounds like in dash then sounds like it releases. it will run hot for a while . i cut it off for 10 min. crank it back up it don't run hot. i also had the radiator rodded out and hoses flushed. could this be a heater core problem? can i by pass the heater core ?will this give me the answer if it don't run hot? can i run the car after bypassing the heater core? just won't have heat right.

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You can bypass the heater core by figuring out a way to join the two hoses that go into the core/firewall. Your problem may be that there is air in the cooling system, and the best way to 'bleed' the system is to fill it when cold, keep the cap off and start the car and let it run until the thermostat opens. The level should drop when this happens, this is where you top off the system to full capacity. Make sure your coolant cap is in good condition and your system holds pressure when hot.

Posted on Mar 21, 2011

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The car will run fine with a heater core bypassed..though if the h-core was leaking there should be water on the pass side floor...you may want to check out your fan switch

Posted on Mar 21, 2011

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Section 03-01D: Diesel Engine, 7.3L V-8 1992 Bronco/Econoline/F-Series Workshop Manual
REMOVAL AND INSTALLATION Please rate highly if this helps. this is 1992, only thing I have, should be the same. Thermostat A poppet-type thermostat is used with the engine. When the thermostat is closed, coolant flows to the water pump through a bypass passage at the front of the engine. When the thermostat is open, coolant flows through the coolant outlet elbow (thermostat housing) to the radiator. ani_caut.gif CAUTION: Replacement thermostats other than the specified Motorcraft or Navistar thermostats may result in engine overheat damage. The specified thermostat does not contain an internal bypass, since the by-pass is located in the cylinder block. Therefore, whenever the thermostat is replaced, it is mandatory that only Motorcraft E5TZ-8575-C or Navistar 1807945-C1 thermostat be installed.
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Removal
  1. Disconnect ground cables from both batteries. NOTE: On vehicles equipped with EEC, when the battery has been disconnected and reconnected, some abnormal drive symptoms may occur while the EEC processor relearns its adaptive strategy. The vehicle may need to be driven 10 miles or more to relearn the strategy.
  1. Drain coolant from radiator until coolant level is below thermostat. Refer to Section 03-03, Engine Cooling.
  1. Loosen and remove alternator and vacuum pump drive belts.
  1. Remove alternator. Position alternator out of the way.
  1. Remove vacuum pump and bracket. Position pump out of the way.
  1. Remove all but the lowest alternator/vacuum pump mounting casting bolt. Loosen the lowest bolt and pivot the alternator/vacuum pump casting outboard.
  1. Remove the water outlet housing attaching bolts. Bend the radiator upper hose upward and remove the thermostat and gasket.
  1. Inspect thermostat as outlined in this section.
Installation
  1. Clean the water outlet housing gasket surfaces. Coat a new outlet housing gasket with Perfect Seal Sealing Compound B5A-19554-A (ESR-M18P2-A) or equivalent. Position the water outlet housing gasket on intake manifold opening.
  1. Install thermostat in crankcase opening with the copper pellet or element toward engine and the thermostat flange positioned in the recess. If thermostat is improperly installed, it will cause a restricted flow of coolant.
  1. Position the water outlet housing against the crankcase. Install and tighten the attaching bolts to specification listed at the end of this section.
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  1. Install alternator and drive belt.
  1. Install vacuum pump drive belt.
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