Heater blows cool air - heater is not working?

Check to make sure your heater hoses are both hot. If they are, then check the actuators on teh heater unit to see if they are working. One is for air direction the other for heat/cool. If they are vacuum look for a vacuum line off or a leak as that can cause your problem. I'm sending a generic pic along, they are under the dash.

Check to see if your actuators are getting power. You might try pulling the heater fuse for 30 seconds and seeing if it will reset. I'll attach a picture of where the actuators are. They direct theheat.

The temperature knob controls the blend door actuator located on top of the HVAC case behind the dash. These are the book tests to determine if the problem is the control head or the actuator itself.

1 Turn ignition on. Using DVOM, back probe terminal "B" (light blue wire) of heater control module connector C2 to ground. Move temperature control knob from hot setting to cold setting, and then from cold setting to hot setting. If voltage varies between approximately 1-12 volts, go to step 3).

2 If voltage does not vary as indicated, check for poor connection at heater control module connector C2 (terminal "B") or short to ground/voltage in light blue wire. Also check for open brown wire between heater control module connector C2 and fuse block. If connection and wires are okay, replace heater control module.

3 Using DVOM, back probe temperature door motor terminal No. 10 (brown wire) to ground. If battery voltage exists, go to next step. If voltage does not exist, repair open Brown wire between temperature door motor and fuse block.

4 Using DVOM, back probe between temperature door motor terminal No. 7 (black/white wire) and terminal No. 10 (Brown wire). If battery voltage exists, go to next step. If voltage does not exist, repair open black/white wire.

5 Using DVOM, back probe temperature door motor terminal No. 8 (light blue wire) to ground while moving temperature control knob. If voltage does not vary between approximately 1-12 volts, repair open light blue wire. If voltage varies between 1-12 volts, check for binding door or poor connections at temperature door motor. If okay, replace temperature door motor.

Replacing the temperature actuator isn't fun. You need to move the instrument panel out of the way to get to it. Below is the book method of removal. You only need to create enough room to access the actuator which means the dash has to roll back about ten inches. If you are careful you can remove the radio and the heater control, drop the column and unbolt the dash and pull it back enough to access the actuator without taking the entire dash out.

INSTRUMENT PANEL
Removal & Installation

1 Disable air bag system. See AIR BAG RESTRAINT SYSTEM article in the ACCESSORIES/SAFETY EQUIPMENT section.

2 Remove instrument cluster trim plate. Move tilt steering column down (if equipped), set parking brake and move automatic transmission gear selector to low (if equipped).

3 Remove left underdash hush panel. See Fig 2. Remove Data Link Connector (DLC) and Remote Keyless Entry (RKE) module connectors. Remove center underdash hush panel. Disconnect park brake release cable from instrument panel. Disconnect park brake cable from ratchet mechanism.

4 Remove right underdash hush panel. Remove lighter and accessory outlets, if equipped. Remove courtesy light. Remove knee bolster. Partially pull A/C-heater control panel and radio to disconnect connectors on back of A/C-heater control panel and radio.

5 Remove 4 steering column retaining bolts and lower steering column. Remove speaker and defroster grilles. Remove 9 instrument panel support bolts, including brake pedal bracket support bolt. Remove electrical connectors. Remove instrument panel. To install, reverse removal procedure.