Check the blower seperately by powering it up with a battery charger..may have a defective relay somewhere..disconnect the battery entirely and connect the charger only to the system cables..be careful to match the polarity..try using the charger as a battery and listen for a hum in the system.. this will show where a short in the system is..
SOURCE: blower motor resistor replacement
the relays are behind the glove box. you have to take the glove box out to have access to the relay for the heating system
SOURCE: 1992 cadillac deville - hvac blower motor does not shut off.
replace the relay , when a relay sticks like that , a good test is to slap it with something like the handle of a screw driver , see if it un-sticks , its not a fix , just a test . cheers'
SOURCE: blower motor resistor location on a 1996 gmc 1500?
It is located on top of the heater box in the passenger side remove the glove box to gain acess there are two 7mm srews and a relay braket holding it in place it is a tight squeeze but can be removed with a 1/4 inch ratchet.
SOURCE: 1998 BMW 328i heater/AC blower is not running
You have clean the blower unit , may be its dirty then . and then check the blower resistor unit for malfunction.
SOURCE: 2005 GMC Sierra 1500 - heater blows, but only cold air
Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.
Testimonial: "You were absolutely correct. Low coolant level. Put in some 50/50 and we're nice and toasty now, but need to find out why coolant was so low. Thanks."
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