I own a 1994 Chevy Silverado Xtended cab P/U. When key is turned to on position, A/C blend door makes a cranking? sound. It continues for about 5 seconds then stops. It does this also when air flow direction is changed. A/C operation is not affected by this. This cranking sound also occurs when vehicle is switched off. Cranking? noise can be heard from outside vehicle. Noise is coming from area of blower moter and heater core location. Would appreciate any help you could offer.
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you need to fix the blend doors. they may be stock on close position .
the sound you say, is from the blend door actuator (motor) that is moving, but not the blend doors. to fix this you need to remove the complete dash board (big job) you need to have good skills to do it sorry.
this is some what normal, as long as it just once that you hear the noise (ie. you turn the truck on and thump, turn the truck of and thump) the doors operate off of vacuum lines in the engine. When you shut the engine off the vacuum goes away and *thump* the blend door snaps back to its normal resting position. then when you turn the truck on the vacuum then comes back and *thump* the door snaps back to its adjusted place.
If you feel that this is not what is going on, this diagnostic technique can help eliminate this condition set the blend door to the hot side and start the truck and it should thump when the engine is on or off. if you didn't get a thumping noise that is good it just means that the blend door is set to the hot side normally open. .
Make sure you have one working ignition key and all remotes for the vehicle.
1) Close all vehicle doors. 2) Insert the key into the ignition. 3) Hold down the power UNLOCK button on the driver’s door panel-continue to holddown until instructed to release in step 9. 4) Perform steps 5 through 8 in fairly rapid succession. 5) Turn the ignition switch to the ON position (as far as you can go without starting theengine). 6) Turn the ignition switch to the OFF position. 7) Turn the ignition switch to the ON position. 8) Turn the ignition switch to the OFF position. 9) Release the power unlock button on the door panel. The vehicle will lock and unlockthe doors automatically. 10) Hold down the LOCK and UNLOCK buttons on the transmitter simultaneously untilthe door locks and unlocks. This step may take up to 30 seconds. 11) Repeat step 10 NOW for each additional transmitter (including any existingtransmitters). 12) Turn the ignition switch OFF then to the ON position in order to exit the transmitter programming mode.
You need to replace the relay or the ignition switch,check for power to the relay in the crank position,[pin 85 or 86] in the plug the relay was taken out of to see if the power to the relay goes away as soon as it is in the run position.If so replace the relay,if not,replace the ignition switch[not the key switch the switch the key switch turns].
The problem is in the heater box. To be more specific, the blend door. Check blend door operation and blend door motor. Located right side under dash. Remove blend door motor, with vehicle running, move switch from panel to defog and see if blend door motor moves.
For a 95 Chevy Silverado....I replaced the Blend Door Actuator on the passenger side. Just behind the slide out cup holder. Yo ucan acces easily by removing the ash tray piece and the glove box....Or just the glove box and work like hell to get a socket in a tight place.
There are 2 actuators....one controlling the (Mode and Temp 89018681) and the other the (Air Inlet 89018367). I called the dealer and the parts were 85-125. I got it From TBA Auto (local store) for 39.00. A 20 min job at most.
I would look at the air blend doors first, it sound like they are not working or your control in the dash is not working send a signal to them. they work by changing the air from hot to cold or in between.