I have a 97 jetta 2.0....i was trying to change the temperature knob from cold to hot but realized it was stuck, while trying to turn it the knob snapped from the inside...now its loose and is stuck in the "cold" side and with the cold weather coming this isnt good news...i was told that you can regulate the temperature for the heater to work in you car from the engine area? if so can anyone tell me...thanks!
IT SOUNDS LIKE WHEN TURNING THE KNOB IT WAS STIFF TO TURN THIS COULD BE CAUSED BY A SEIZED CABLE IF CABLE IS NOT SEIZED OPEN UP YOUR HOOD AND WHERE THE HEATER CABLE GOES THROUGH THE FIRE WALL THE CABLE SHOULD GO TO A FLAPPER WHICH IF PUSHED ONE WAY GIVES COLD AIR IF PUSHED THE OTHER WAY GIVES HOT AIR PUSH IN THE OPPOSITE DIRECTION TO WHAT IT IS NOW PUT A SMALL PAIR OF VISE GRIPS ON END OF CABLE SO IT CANT SLIP BACK TO COLD POSITION UNTIL YOU CAN GET A NEW KNOB IF CABLE IS SEIZED YOU WILL HAVE TO REPLACE CABLE+
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Sorry for your troubles ,
Temperature Hand in dash reading NORMAL ?
Does it Turn Blue to Red if so is do you feel friction or restraint like your turning something rather than freewheeling (smooth fast turning) or Digital and or does it show that it should be warm and not cold ?
Does the TEMP change at all(even the least little bit could narrow the results down) when knob is turned?
POSSIBLE - The Actuator/Motor that switches the VENTS very well could be BAD , Temperature Switch / Climate Control Switch (hot to cold could be broke at the base and only allowing the knob to turn and not in the switch ) Thermostat may be stuck open (keeping the engine running cool and smooth but no heat , maybe just a slight TEMP change when switched from Cold to Hot ). The A/C Switch is pushed in or turned on or broke and is stuck ON
FIXES - 1st- Check FUSES - If Temp HAND Reads Normal it not your THERMOSTAT. - Change the Control Switch / Temp switch - Check A/C Button/Knob . AUTOZONE is my place of business they PRICE MATCH AS WELL!
Hope this Helps , Flaming Ratchets Auto Repair
I can tell you about my experience on my 1999 F150. I do not believe it is the blower control switch because mine went out and only affected the fan speed. On my truck, in an incident like yours, I could not get a good response from the temperature switch.
I would turn the control and it would hit a stop on both ends, but the temperature would not change to match the switch. What I found is the stem of the temperature control did not turn because the knob cracked behind the switch. There is a half-moon shaped metal clip inside the plastic temperature knob. The clip can spin when the knob is cracked and nothing moves right.
Because the plastic knob has molded stops under the knob, from the drivers point of view, the knob was turning lock to lock. In reality, the stem was not turning. Try taking the knob off and turning the stem with pliers wrapped in cloth to protect the plastic. Then see if the temperature changes.
If it won't start while cold, it could be the cold start fuel injector is not working or clogged. Check also for a large vacuum leak which could be diluting the fuel mixture. Check for a bad MAP or MAF sensor.
If it won't start hot, look for leaking fuel injectors or an engine coolant temperature sensor disconnected, the wires to it broken, or a faulty sensor. If the engine coolant temp sensor is stuck at full cold (which it would be if disconnected), it will tell the computer the wrong engine temp and the computer will schedule too much fuel for a hot start leading to flooding.
The HVAC system uses engine vacuum to open and close the blend doors. Check for a broken vacuum line in the engine compartment. It will exits the firewall left (passenger side) of center and will be a hard plastic line. With age and exposure to engine compartment temperatures they become brittle and break. It can be repaired with a rubber vacuum line that fits snugly over the line to reconnect them.
If the blower is blowing air just fine, but you cannot control the temperature, you need to listen to air coming from the vents while turning the temperature from hot to cold. If you do n ot hear any change in airflow, then you may a temperature door in the dash broken. this is becoming a common problem on the Equinox
Did the switch break because it was stuck? If so, then yes, they will have to change actuators and doors. Does the fan work on all speed setting? If so then you do not need a blower resistor. The resistor pack only controls the current flow to change speeds of the fan.