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1994 Oldsmobile Ciera No Heat

Tiny
SMAILLIW
  • MEMBER
  • 1994 OLDSMOBILE CIERA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 16,000 MILES
No heat inside car. Changed thermostat. Car not overheating (water pump good?) Set temp at 90
little or no heat from vent.
Tuesday, December 2nd, 2008 AT 5:19 PM

3 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Heater core could be plugged, blend door malfunction, or heater valve broke.

Check heater core hoses, if one is hot and one is cold, then heater core is plugged.

Watch heater valve when moving selector from hot to cold, cable could be loose/broke.

Check blend door by moving selector from vent to floor, if no change then blend door is not moving/stuck.
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Tuesday, December 2nd, 2008 AT 5:49 PM
Tiny
SMAILLIW
  • MEMBER
  • 2 POSTS
Temp adj. Is elctronic not mechanical. No valve visable. Blend door ok. Both hoses warm to core.
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Tuesday, December 2nd, 2008 AT 6:26 PM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Hoses to core should be hot, when engine is at temp.
If scan tool is available, check the ECM temp, if normal, then I would recheck coolant level, if OK then you may have a restriction in cooling system.
Drain and flush cooling system, make sure the heater is set to high heat.

I doubt it is waterpump, especially since it is not overheating.

Other possibilites are that the thermostat is bad (even though it is new).
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Thursday, December 4th, 2008 AT 10:19 AM

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