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1998 Oldsmobile Silhouette cooling system

Tiny
TIMELESS48
  • MEMBER
  • 1998 OLDSMOBILE SILHOUETTE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 170,000 MILES
My friends sillouette, heats up too hot and then drops down to too cool, He changed the leaking water pump and somewhat flushed the system. When it heats up too much the heater in the van gets very hot, but when it drops down it does not throw any heat, Got any ideas on this---thanx -Rick
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Saturday, January 16th, 2010 AT 8:19 PM

1 Reply

Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
Hi
this is caused usually by two things. Thermostat failing.
Or air in the system. This eng has a bleeder near the tstat housing run the eng until norm operateing temp. Loosen this bleeder when pure coolant is flowing system is bled.
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Saturday, January 16th, 2010 AT 8:33 PM

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