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Have a 00 jetta the air/heat used 2 work at idle now it only works at high rpm's. The switch used 2 work on low & now it has 2 b on high with high rpm. What is goin on

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  • Cars & Trucks Master
  • 5,324 Answers

Could be blend door actuator is failing due to vacuum leak which would also explain why only works at high rpm.

Posted on May 01, 2015

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6ya6ya
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Posted on Jan 02, 2017

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GM Elec
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SOURCE: high/low sensor switch location for 1999 Buick Century

Ros.....The heater motor is located under the dash on the right hand side (passanger side). You will have to remove the close out panel to access. The resistor you are looking for will be to the lower left of the fan motor at about the 7:00 position. Illustration is below.
let me know.
regards,
0900c15280217dd1.gif

Posted on Feb 10, 2009

Molson02536
  • 3854 Answers

SOURCE: Idle seems a bit high. Need to know how to adjust and what RPM

There are a couple of things that come to mind. One is make sure the EGR Valve and intake manifold are not carboned up. I normally have to clean them every 60 to 80,000 miles. It will actually close up with Carbon and restrict air flow and make the EGR valve malfunction. 
Secondly, the diesel pump may just have a lot of wear and it is putting out too much fuel at idle. The only way this can be checked is by the dealer with a VW specific scan tool such as VAG-COM. With this tool, you can go in and look at the the pump timing and start injection quantity. 
I have the start injection quantity many times but you have to have the software and login to get the readings. Most dealers will not do this but would rather sell you a pump if it is off.
Remove the hose from the intake where it connects to the EGR valve and look at the inside with a flashlight. See how much carbon is accumulated. This may not solve this problem but will help with starting and performance issues if corrected.

Good luck and hope this helps. To adjust the Idle, it needs to be programed in to the ECM so i am thinking that it's a Carbon issues that is restricting the air flow which the ECM is compensating to keep the engine from stalling.

Posted on May 22, 2009

  • 1565 Answers

SOURCE: I have a 2006 Ford

http://www.youtube.com/user/scottykilmer#p/u/2/80jSH8VQZms

take a look

Posted on Aug 03, 2011

emissionwiz
  • 76846 Answers

SOURCE: Idle Rpm Too High.

A high idle is caused by either a massive vacuum leak or a sticking idle speed control valve. I would think you have a vacuum leak, use a can of carb spray and shot around the top[ of the engine, if you hit a leak the engine will sound different, repair as needed.

Posted on Feb 22, 2012

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Keeps throwing up trouble codes p1506,p1151,p0302,p0171


Definition of Diagnostic Trouble Code P1506 Audi: Closed Throttle Position Switch Does Not Open/Short to Ground BMW: Idle-Speed Control Valve Opening Solenoid Control Circuit Signal High Ford: Idle Air Control Overspeed Error (see P0507) Jaguar: Idle Air Control System RPM Lower Than Expected - B Bank Kia: IAC Valve Opening Coil Voltage High Lincoln: Idle Air Control Overspeed Error (see P0507) Mazda: Idle Air Control Overspeed Error Mercury: Idle Air Control Overspeed Error (see P0507) Porsche: Throttle Jacking Unit Lower Mechanical Stop, Signal Implausible Volkswagen: Closed Throttle Position Switch Does Not Open/Short to Ground Volvo: IAC Valve Opening Signal
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Definition of Diagnostic Trouble Code P1151 Audi: Bank1, Long Term Fuel Trim, Range 1 Leanness Lower Limit Exceeded BMW: Oxygen Sensor Heater Circuit Signal Intermittent (Bank 2 Sensor 1) Ford: Lack Of Heated Oxygen Sensor Bank 2 Sensor 1 Switches - Sensor Indicates Lean Jaguar: Lack of H02S-21 switch, sensor indicates lean Land Rover: Lambda control limit bank 2.Implausible signal/condition Lincoln: Lack Of Heated Oxygen Sensor Bank 2 Sensor 1 Switches - Sensor Indicates Lean Mazda: Lack Of Heated Oxygen Sensor Bank 2 Sensor 1 Switches - Sensor Indicates Lean Mercury: Lack Of Heated Oxygen Sensor Bank 2 Sensor 1 Switches - Sensor Indicates Lean Subaru: HO2S-12 Heater Circuit High Input Toyota: Coolant Path Clog Up for Coolant Heat Storage System Volkswagen: Bank1, Long Term Fuel Trim, Range 1 Leanness Lower Limit Exceeded
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Definition of Diagnostic Trouble Code P0302 Category: Powertrain Definition: Cylinder 2 Misfire DetectedNote: This definition of P0302 is applied to all manufacturers
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Definition of Diagnostic Trouble Code P0171 Category: Powertrain Definition: System Too Lean Bank 1Note: This definition of P0171 is applied to all manufacturers

Jun 17, 2015 | Cars & Trucks

1 Answer

Engine overheating on low rpm


Could not agree with you more - was thinking that it was a circulation problem with coolant when you mentioned your suspicions.

May 04, 2017 | 2006 Pontiac Montana SV6

1 Answer

Idle Rpm Too High.


A high idle is caused by either a massive vacuum leak or a sticking idle speed control valve. I would think you have a vacuum leak, use a can of carb spray and shot around the top[ of the engine, if you hit a leak the engine will sound different, repair as needed.

Feb 22, 2012 | 1991 Toyota Pickup

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My 2003 Jetta GLX (V6) starts with a very low idle 800-900 regardless of the outside temperature and maintain at 850 or so during normal operating temperature. The idle is too slow to kick-in the...


Thanks for choosing FixYa and welcome to the site. There are a few things that come to mind when hearing your issue. You need to adjust your idle and see if that is the issue. Try turning it up and see if that is why you have low rpms. If the adjust doesn't solve your issue, you may have a bad idle control sensor. You still want to make sure that the battery is good and holding a proper charge. Inspect your battery wires and make sure the terminals are clean and not damaged. Make sure the post are clean as well. If your vehicle is not getting enough power to certain parts, it is going to effect the car in a negative way. Look over your engine and scan it to see if you have a vacuum leak. A simple leak can cause the car to act up. You want to make sure that the fuel filter and air filter are not clogged. You should test to see your current fuel pressure just to see if it can be fuel related. I would lean more to the idle sensor if adjusting the idle does not work. I am concerned about the battery and alternator light though. Even if it is at low idle, you shouldn't be seeing them. Make sure you check out the battery and the wires, from the battery to the alternator. If it is possible to get codes off your computer, by all means do so. This may lead you to the root of the problem. I know it is a lot to check but anyone of these parts can cause your issue. Feel free to ask any questions you wish.

Apr 13, 2011 | Volkswagen Jetta Cars & Trucks

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The idling fluctuates to high rpm and to low rpm without touching the accelerator


vacume leaks will cause that listen around for any hissing or whistling and fix any if found.

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98 Jetta loses power at 20MPH...2-3k RPM


air flow meter reader playing up ,try cleaning the sensor in the airflow tube with some easy start or brake and clutch cleaner

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1 Answer

00 jetta ac not cooling, fans and a/c comp./clutch is working but no cool air.. unhooked the low side switch i think it is up top near the fire wall clutch kicks off on the a/c compressor so im guessing...


I would guess your freon has slowly leaked out, and now simply needs to be recharged. You can buy an AC recharge kit with R134 at Walmart or someplace, and do it yourself quite reasonably. If it doesn't cool after that the way everything else seems to be normal, it would probably have to be the temperature control switch.

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Check your vacuum lines, make sure there is no leaks, and go from there, then all you electrical connection in the engine compartment.
I have a 1996 Jetta Trek Edition, the hoses, and wire harness, are so brittle, any movement can cause hoses and wire insulation to crack.

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1 Answer

Not reving high on cold start


Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

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