1993 Cadillac Deville heater doesn't work...

[quote:15ec3f6b1f="cjsweets04"]Heater problem
1993 Cadillac Deville V8 159103 miles
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my a/c blows cold but the heater doesn't work...even at 90 degrees.....what could be the cause and how could i fix it??[/quote:15ec3f6b1f]

If its blowing cold air @ 90*
Check coolant check thermostat and if all good
Blend door

[quote:6f509459b4="cjsweets04"]Heater problem
1993 Cadillac Deville V8 159103 miles
----------------------------------------------------------------
my a/c blows cold but the heater doesn't work...even at 90 degrees.....what could be the cause and how could i fix it??[/quote:6f509459b4]

ck heater hoses for warmth on both hoses to heater core also.