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No Heat

Tiny
THINLINE10
  • MEMBER
  • 1994 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 121,000 MILES
Replace water pump, thermstat, 50/50 car still have no heat it come on some time and than blow cold. What could it be 1994 cad devill 4.9
Thursday, December 9th, 2010 AT 3:15 AM

4 Replies

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Was it working before you drained the coolant? These have a nasty habit of trapping air since the thermostat housing is the highest component in the cooling system.
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Thursday, December 9th, 2010 AT 5:03 AM
Tiny
THINLINE10
  • MEMBER
  • 3 POSTS
Please tell me how to get air out thank you thinline10
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Friday, December 10th, 2010 AT 12:22 AM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
If it is air in the cooling system, you can disconnect the hose that leads from the t-stat housing over toward the heater core, and pour fluid in it. It is the one with a 90 degree bend and has a larger size on the t-stat housing side. It sits in a plastic saddle above the rear valve cover. The object is, to try and get coolant behind the thermostat so it can heat and open up. Usually if air is a concern, you may see some overheating as well. Eventually, it should be expelled on its own. The other possibility is a clogged heater core.
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Friday, December 10th, 2010 AT 3:49 AM
Tiny
THINLINE10
  • MEMBER
  • 3 POSTS
Thank you so much had heat core flush thats what it was thank you qstacey. Thinline10
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Saturday, December 11th, 2010 AT 9:42 PM

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