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I imagine it's some type of electrical problem with my hvac system in my car that resulted shortly after experiencing a problem with my thermostat that remained open and caused my engine light to

I'm now experiencing a serious problem where now I don't have any heat, front defroster, rear window defogger, power windows will not work, the blower will not work. I live in Nevada where the temperatures are in the single digits. During the onset of these issues I noticed that if I jiggled my key in the ignition while the vehicle was running all problems would resume normal operation. Other times when nothing would function and turned the vehicle off and let the vehicle sit for awhile everything seemed to function normally again. Now, nothing is working whether I jiggle the key, or let the vehicle sit after operation. I've checked all the fuses within the engine compartment, and inside the vehicle too and all appear normal. Earlier symptoms prior to these current problems my engine coolant would heat up inside the coolant reservoir and spill out through the pressure cap The radiator does not facilitate a radiator cap with this type of cooling system and that pressure cap I know needs to be replaced because when it overheated the spring mechanism inside the pressure cap blew to allow the pressure to release through cap.

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Its sounds like it might be the ignition switch but I don't have enough info, year make model engine trans etc.
I sometimes Google my problem to see how many other people this has happened to.

Posted on Mar 04, 2017


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: 20-amp starter/ignition fuse keeps blowing & car won't start

its the starter

Posted on Aug 03, 2008

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SOURCE: 1997 honda civic over temp. Have replaced

Generally if one hose is hot, and the other hose is cold it indicates that they water is not circulating. You could have a defective thermostat. Take the thermostat out and run the engine without it. With the radiator cap off you should see a lot of water moving through. It that is the case, replace the thermostat and you should be ok. If there is no rapid movement of water it may be the impeller on the water pump came loose. This is rare, but it can happen since the impeller is usually pressed on the shaft. You should also check and see if you get a lot of bubbles when the car is running and the cap off. This often indicates a blown head gasket. Hope this helps.

Posted on Aug 10, 2010

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SOURCE: 2003 Lincoln LS V8 3.9.

I dont think the coolant is boiling, I think you have an air bubble in your system wich is causing a air lock and youll need it flushed out. Your reservior cap should be tight always.. never loose this is an air tight system and your allowing it to get air in it. I have a 2002 linc ls and just had to pay 1000.00 to replace the system because I let an air lock go for too long and had so much back pressure I blew up my reservior.

Posted on Sep 12, 2010

Testimonial: "Thanks a lot. I've changed the coolant reservoir and reservoir cap. now it seems everything is ok with my car. so, your advise was really helpful."

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SOURCE: 2005 GMC Yukon Denali XL - Climate Control issue-

Are you aware of any codes that may stored in the body control module and do you hear a clicking or ticking noise in the rear?

Posted on Nov 02, 2010

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Replaced blower and resister on 2001 Dodge Dakota but no air flow through vents Why?

Is there B+ voltage to the componets ? Have a good ground circuit ? Do you know how to do automotive electrical testing ? How to read an use a wiring diagram to find testing points in a electrical circuit ? Test an don't guess when dealing with automotive electrical circuits .
Free wiring diagrams here Enter vehicle info. year , make , model and engine size . Under system click on HVAC .Then under subsystem click HVAC controls . Click the search button then the blue link. Fuse #13 40 amp powers the ignition switch ,which when in the run position will supply B+ voltage to the blower motor ! Do you have battery voltage there ? From there it goes to the resistor for low , med 1 an med 2 . For high speed it goes directly to the HVAC control panel through the switch to ground .
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
Electric Testing Techniques You Need to Know

Jul 22, 2017 | Dodge Cars & Trucks

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How do I remove the center console where the heater control switches are located on a 2006 Pt Cruiser GT

DESCRIPTION A manual temperature control (MTC) single zone type heating-A/C system or a manually controlled heater-only system is standard equipment on this model, depending on market.
To maintain the performance level of the heating, ventilation and air conditioning (HVAC) system, the engine cooling system must be properly maintained. The use of a bug screen is not recommended. Any obstructions in front of the radiator or A/C condenser will reduce the performance of the A/C and engine cooling systems.
The engine cooling system includes the radiator, thermostat, radiator hoses and the engine coolant pump. Refer to 7 - Cooling for more information before opening or attempting any service to the engine cooling system.

All vehicles are equipped with a common heater, ventilation and air conditioning (HVAC) housing (1). The heating-A/C system combines heating, ventilating and A/C (if equipped) capabilities in a single HVAC housing mounted within the passenger compartment beneath the instrument panel. The HVAC housing includes:
  1. Mode-air doors (2)
  2. A/C evaporator (A/C system only) (3)
  3. Recirculation-air door and actuator (A/C system only) (4)
  4. Blower motor (5)
  5. Mode control cable (6)
  6. Temperature control cable (7)
  7. Heater core (8)
  8. Blend-air door (9)
On heater-only systems, the A/C evaporator is omitted from the HVAC housing and is replaced with an air restrictor plate.
Based upon the system mode selected, conditioned air can exit the standard heater-only or optional heater-A/C housing through one or a combination of the three main housing outlets: defrost, panel or floor. The defrost and panel outlets are located on the top of the HVAC air distribution housing and the floor outlets are located on each side of the distribution housing. Once the conditioned air exits the HVAC housing, it is further directed through molded plastic ducts to the various outlets within the vehicle interior. These outlets and their locations are as follows:
  1. Defroster Outlet- A single large defroster outlet is located in the center of the instrument panel top cover, near the base of the windshield.
  2. Side Window Demister Outlets- There are two side window demister outlets, one is located at each outboard end of the instrument panel top cover, near the belt line at the A-pillars.
  3. Panel Outlets- There are four panel outlets in the instrument panel, one located near each outboard end of the instrument panel facing the rear of the vehicle and two located near the top of the instrument panel center bezel.
  4. Front Floor Outlets- There are two front floor outlets, one located on each side of the center tunnel near the dash panel.
  5. Rear Floor Outlets- There are two rear floor outlets, one located on each side of the floor panel center tunnel near the front of each rear seat foot well.
    WARNING: Disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to follow these instructions may result in accidental airbag deployment and possible serious or fatal injury.

    NOTE: Illustration shown with instrument panel removed for clarity. (Refer to 23 - Body/Instrument Panel/BEZEL, Instrument Panel - Removal).(Refer to 24 - Heating and Air Conditioning/Controls/CONTROL, A/C and Heater - Removal).(Refer to 23 - Body/Instrument Panel/COVER, Steering Column Opening - Removal). 5. Remove the screw (1) that secures the temperature control cable (2) to the left side of the HVAC air distribution housing (3). 6. Disconnect the temperature control cable from the blend door pivot lever (4) and remove the cable from the vehicle.

    WARNING: Disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to follow these instructions may result in accidental airbag deployment and possible serious or fatal injury. (Refer to 24 - Heating and Air Conditioning/Controls/CONTROL, A/C and Heater - Removal).(Refer to 08 - Electrical/Clock - Removal).(Refer to 08 - Electrical/Power Windows/SWITCH, Power Window - Removal).(Refer to 24 - Heating and Air Conditioning/Distribution/OUTLET, Air - Removal).

Oct 31, 2016 | Cars & Trucks

1 Answer

I have a 2000 oldsmobile bravada and it's blowing hot air even when the temp is turned down. Do I need to replace the thermostat?

No you don't need to replace the thermostat . More then likely the mode door behind the dash is stuck on heat ! What system does you bravado have , HVAC Systems - Manual HVAC Systems - Automatic
do you know ?
Heat Excessive
The most likely cause of excessive heat from the heater system is a bad air temperature actuator. Other related causes of excessive heat include a faulty mode selector (control assembly), or an open or shorted electrical harness.
You would need to take parts of your dash apart to replace either one of these components. You may find a video on you tube showing how to do it . Or your best bet is to take it to a ASE certified repair shop .

Mar 14, 2016 | Oldsmobile Cars & Trucks

1 Answer

How do i get to the drivers side HVAC blend actuator

You have to just about pull the whole dash out !

Removal Procedure

  1. Remove the front floor kick-up panel. Refer to Kick-Up Panel Replacement - Front Floor in Interior Trim.

  2. Remove the cover from the I/P electrical center.

  3. Remove the HVAC CON (HVAC controls) MiniFuse?® #27 from the I/P electrical center.

  4. Remove the I/P upper trim pad. Refer to Instrument Panel Upper Trim Pad Replacement in Instrument Panel, Gauges and Console.

  5. Remove the instrument panel cluster (IPC) to steering column bracket retaining screws.

  6. Reposition the IPC to better access the LH temperature valve electric actuator.

Is yours manual or automatic HVAC system ? if you haven't done this before I suggest you take it to someone who has !

Jun 02, 2015 | 1999 Chevrolet Corvette

1 Answer

2006 freightliner was a mercedes keeps blowing hvac fuse

You have a short, where that might be is anyone's guess. You will need a trained electrical tech to track this down.

Jun 16, 2012 | Cars & Trucks

2 Answers

Heater won't turn on sometimes, or turns off by itself and only works on High.

I can't diagnose unless you can do some testing? This is part of diagram for automatic hvac. At the blower motor, terminal B is voltage, terminal A is ground. Use a test light, check voltage and ground with hvac on, Have to check when problem is ongoing. If good voltage and ground with no blower action, suspect the blower motor is faulty. Of course, if your missing voltage or ground, have to track that circuit. Faulty blower motors may run intermittently. When problem is ongoing, hvac on, you can try tapping blower motor with screwdriver handle see if it starts running, if it does, I suspect the blower motor has a problem. Check hvac trouble codes, where applicable.
blower motor-glvii1gxkt1idx3zyylb1u0i-1-0.jpg

May 30, 2017 | 2001 Buick Century

2 Answers

The ac compressor kicks on and off. We have had a professional look at it, but they couldn't find a problem. However, the compressor doesn't run long enough to get the air cold. Is this an...

Could be either. Usually if the compressor is cycling than its usually low on refrigerant. Could be pressure sensor. Could be cooling fan. I would have a different tech look at it. It is hard to diagnose what is going on without knowing pressures of the high and low side from a gage hooked up to the system.

Jun 06, 2011 | 2004 Chevrolet Venture Passanger

1 Answer

How do you replace a blend door on a 2006 Chevy Equinox? Is there a diagram? Car is blowing cold air...fluid level is good, pipes to/from firewall are warm.

Pull the instrument panel (dash board), remove the HVAC case, disassemble the HVAC case and replace broken door (G.M. Part #19130554) and reassemble. The job takes an experienced mechanic about 8.5 hours with air tools and electric screw guns, and costs about $1050.00 (including evacuating and recharging the A/C system.

Oct 29, 2009 | 2006 Chevrolet Equinox

1 Answer

Electrical short

More labor intensive than anything. Tracing wires is no easy task but it can be done. In my honest opinion no this will not be an easy fix, but depending on who does the grunt work of tracing the wires and grounds you can help control the cost. Hope this gives you some direction. Thanks for Using FixYa!



Dec 03, 2008 | 1992 Buick LeSabre

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