Re: heat only coming out of vents on my 2000 blazer
Most Heater control mechanisms use vacuum actuators to move the various gates to direct the air around, You most likely have a vacuum line off of the heater control it'self or on the other side of the firewall on the brake booster or intake manifold. If you have a push button style electronic climate control they simply use solenoid valves instead of a manual vacuum selector, you have lost the main vacuum line as by default when all of the gates are spring loaded back to rest the air almost always comes of of the vents.
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Re: heat only coming out of vents on my 2000 blazer
This is a bad selector swutch on your Blazer and it requires either a salvage yard part or a dealership part. Don't be surprised if it is a bad solenoid motor that switches the doors inside the dash as well these problems usually run together.
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Hi Sharon, I'm glad to help. Your 2000 year doesn't have a motor for the temp door. It operated by a cable running from the control head to the temp door and you work it manually. If you can't control the temperature from hot to cold, sometimes the cable come off or breaks. Here how you can see the cable to see if its working. Remove the radio and right behind it you will see the cable attached to the door, while watching it move the temp lever from hot to cold and watch it. If it is moving then its most likely out of ajustment. If it is not moving, then you'll need a new cable. Just in case it is moving, I'm attaching the instruction on how to adjust it below. Hope this helps and have an awesome day Sharon!
TEMPERATURE CONTROL CABLE
Any time the heater-A/C control or the temperature control cable are removed and/or replaced, the following procedure must be performed.
The temperature control cable housing and core must be installed at both the heater-A/C control and the heater-A/C housing ends, and the heater-A/C control must be installed in the instrument panel. See Heater-A/C Control and Temperature Control Cable in the Removal and Installation section of this group for the procedures.
Rotate the temperature control knob on the heater-A/C control so that the knob pointer is in the 12 o'clock position.
Pull the temperature control knob straight out from the heater-A/C control base until the perimeter of the knob (not the knob pointer) protrudes about 6 millimeters (0.25 inch) from the face of the control base.
Rotate the temperature control knob to the 1 o'clock position. Push in on the knob slightly and continue rotating the knob to its full clockwise stop. The knob pointer should be aimed at a position about 8 millimeters (0.315 inch) beyond the end of the graduated red strobe temperature control graphic on the face of the heater-A/C control base. If the knob is not pointed to the correct position, go back to Step 2 and repeat the adjustment procedure.
Rotate the temperature control knob counterclockwise until the knob pointer is in the 12 o'clock position again.
Push the temperature control knob straight in towards the heater-A/C control base until the perimeter of the knob (not the knob pointer) is flush with the face of the heater-A/C control base.
Rotate the knob to its full clockwise stop again. The knob pointer should be aimed at the end of the graduated red strobe temperature control graphic on the face of the heater-A/C control base. If OK, go to Step 8. If not OK, go back to Step 2.
Rotate the knob to its full counterclockwise stop and release the knob. If the knob springs back from the counterclockwise stop, the self-adjuster clip that secures the temperature control cable to the blend-air door lever is improperly installed. See Temperature Control Cable in the Removal and Installation section of this group for the procedures. If the knob does not spring back, the temperature control cable adjustment is complete.
i'd think that the vent adjuster knob/slider is not working correctly strip out the heater panel around the control knobs and check the vent direction is working properly either stiff operation so a little wd40 on the cable would probably do the trick or some thing causing the vent itself to not move
your gonna have to remove actuator and manually move door to see it that helps. did you get right actuator? there are 2, 1 manual and 1 auto climate controls. maybe reduce file size or change format? Take a look www.xcardiag.com
when engine is warm try touching the coolant line to your heater core under the hood pass side
if they are both hot coolant is flowing true and heater core should be o.k.
if not have it reversed flush
if o.k the a/c to heat door may be stuck not allowing air from heater core in or actuator to that
door has malfunction
Most likely the heater control switch has gone bad. If you follow the heater hoses coming from the firewall you will find a junction that at a minimun 2 hoses attach with a vacuum line. That is your heater control switch. If the diapham goes bad in it you lose your heater.
If you have warm air coming through the defroster vents then your core is not gone. there is something blocking or bent on the heater box mechanism which directs the air flow up or down, or on the climate control knob which controls it, or in the cable which connect the two.
I believe you are correct. The cable running from the thermostat control knob to the vent lever can disenguage from the vent assembly. You can remove the plastic side panels below the radio/heater housing to see the cables. Move the heat/cool knob back and forth to locate the correct cable and see if it has fallen out of the vent assembly.
These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.