Question about 1997 Volkswagen Jetta

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Broken temperature knob

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!

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  • Anonymous Oct 23, 2008

    same problem.. identical year for me as well..

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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+

Posted on Oct 23, 2008

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My 97 Nissan Altimas temperature gage inside car dash is stuck on the highest setting, past Hot. I replaced thermostat and temperature sensor. It's still not working. What else could be the problem?


Are you saying the gauge is stuck on hot even when the engine is cold ?
There could be a short to ground in the wiring or in the instrument cluster.

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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!
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The heater box is stuck on hot.This could be the result of a the cable being loose, slipped off, unattached -- the stem behind the knob selector may be broken they sell kits to repair these

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Even though you have a manual HVAC system it still has the capability to set an store DTC'S - diagnostic trouble code's .
DTC B0413 02: Temperature Control 1 Feedback Circuit Short to Ground (CJ3)
DTC B0413 05: Temperature Control 1 Feedback Circuit Short to Battery or Open (CJ3)
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DTC B0423 05: Temperature Control 2 Feedback Circuit Short to Battery or Open (CJ3+C67)
DTC B0423 61: Temperature Control 2 Circuit Actuator Stuck (CJ3+C67)

Did you have Actuator Recalibration done after replacing the actuator or control module ?
Your best bet ,take your vehicle to a qualified repair shop .
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Place the ignition switch in the OFF position.
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Start the vehicle.
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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.

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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.

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