Hi!
It
appears we have an Air lock scenario and you will need to perform a
system Bleed.
Park
the vehicle on level ground, when cold remove coolant filler cap,
start engine and leave to idle, turn heater on full and blower to
max. When engine reaches operating temperature watch and listen near
coolant filler, keep clear as gurgling and hopefully a boil over
should occur. Top up with very warm coolant and wait as it may do it
again.
Check
for heat inside vehicle if warm replace coolant cap but keep an eye
on temperature gauge as the ~Air lock may have moved on from heater
matrix/core so proceedure needs to be carried out again from COLD.
If
persistent boil ups/over attention must made in the cylinder head
or
gasket area, or possibly water pump?
Please
press the Blue button to appraise my FREE Efforts, Thank You!
Paul
'W' U.K
Onyeredson has a great write up, no doubt.
But this is a lot of steps to take when considering that jmh didnt mention a leak or that he ever opened up the cooling system, thus how did the air lock get there?
I also would check the thermostat, besides if you never changed it on a 97 automobile, it time to anyway. they are only a couple of $. the thermostat is bolted onto the front of the motor, three bolts. it has a large aluminum knuckle looking thing with a flange and your three bolts. a large rubber hose is attached to the other end of the knuckle....hope this helps....if its not the thermostat, or blocked heatercore....reread onyeredson.
The aurora's are self bleeding check the small hose going the top of your coolant bottle and see if you have coolant flow. If you do not there is a blockage there. You can try to use compressed air to clear this work well for me. You should see air bubbling in bottle when clear. When clear fill start engine bring temp up so stat open then fill as needed then put cap on let idle for a few minutes then let cool. Check coolant level after an hour add if needed
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