Question about 1999 Jeep Wrangler

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No heat when i turn the cold to hot knob its does not go to heat. It looks like there is a control switch of somekind down by the floor, is this the same as the old vacuum control switches like on older cars

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You could have a bad heater control valve that is located under the hood inline with one of the heater hoses.

Posted on Oct 07, 2008

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Blower comes on but no heat come out


some of these have vacuum controls look on fire wall for a vacuum line going into dash

Dec 11, 2013 | Cars & Trucks

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My 2005 kia sorento will not switch from hot to cold and vise versa. the mechanic is saying its probably the "airdoor actuactor motor / mixer actuator. any advice and where to buy this part(s) for a g


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

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My cold/hot knob on front dash clicks when i turn to hot


Look under the dash above the gas pedal and switch the hot to cold knob back and forth. you will see a cable hooked to a white plastic cam, this cable usually pops off the black plastic housing and causes this. If it is connected there it is in the control knob itself.

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Had the battery changed, but now the (heat) vents in the top of the van and the floor vent (heat) does not work - only cold air comes out. Also, the heating/cooling dial lets it get hot midway on cold...


Try this calibration procedure and let us know if you have more questions:
  1. Start the vehicle.
  2. Wait 40 seconds for the HVAC control module to self-calibrate.
  3. Verify that no DTCs have set as current DTCs.
  4. Clear all DTCs.
  5. Place the ignition switch to the OFF position.
  6. With the Mode knob in the PANEL position, press and hold the AC button for 5 seconds.
  7. Rotate the Mode knob fully counterclockwise.
  8. Rotate the Mode knob fully clockwise.
  9. Rotate the Mode knob fully counterclockwise.
  10. Release the AC button.
  11. Wait 40 seconds for the HVAC control module to self-calibrate.
  12. Start the vehicle.
  13. Verify that no DTCs have set as current DTCs.

Nov 14, 2010 | 2005 Pontiac Montana SV6

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Honda Accord LX has bad temperature control switch? I just got my A/C recharge with new freons and it is working. Before it was just blowing hot air when A/C is switch on and the A/C control knob turned to...


  1. what year model is accord?
  2. there are several doors in the air box
  3. blend door (hot cold)
  4. mode door (defrost, floor, vent)
  5. recirculation door (outside air)
  6. if the control mechanism is defective. the tech may have reached under the dash and manually opened the blend door.
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1997 ford e250 van. heat only no cool air. New heat valve (vac. controld). If dash control knob is on red or blue (hot or cold) hot air comes out of floor, mix, or defrost depending on position of delivery...


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Jan 20, 2010 | 2002 Ford E250

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2002 Pontiac Bonneville, will not switch from a/c to heat unless you manually move the actuator over (I think that is what he called it). Has anyone had a similar problem? It will get hot or cold but will...


the vaccum control switch on the dash is bad. it is a funny looking little black thing with several hose hookups on it. remove the control knob for switching from ac top vent to floor vent.very inexpensive. not easy to replace

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2000 s type jaguar has no heat


It will probly be the heater tap that is down by the radiator. It has a 3 pin plug with 2 control solenoids on it. If you can connect scope and check is switching to earth set heat around 19 deg c. If that is fine the tap has swollen seals and the only way to fix is to replace.

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1994 Taurus heat control problem


First check to see if the water to the heater core is hot. if not then you need ti check the hot cold vale . it is an electric valve that opens to let the hot water bvy.

Dec 05, 2008 | 1994 Ford Taurus

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2001 chevy s10 no heat


remove the heater hoses at heater core and backflush heater core with a water hose it is clogged

Oct 02, 2008 | 2001 Chevrolet S-10

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