Question about 1995 GMC Suburban

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Front heater not working

I pulled the controls from the dash and found that when the hot cold switch is on cold the test light lights up as you start to turn it toards the heat the light goes out but i cant find any power for the heat in the switch assembly

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It is probably the control head. gm had lots of problems with control heads

Posted on Nov 30, 2008


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My dash lamp and radio/ heater control lamps are out and I cannot find anything in the manual. I tested all of the fuses in the two fuse boxes I found, and they all tested good.

check the switch for the headlights that you turn on to put the lights on. make sure the dimmer switch part is not in the off position as this will turn the interior dash/radio/heater control lights off. just turn the dimmer switch to see if the lights re-appear.

Oct 14, 2014 | 2004 Ford Explorer

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Once again new problems. 2000 Dodge Status SE 2.4 DOHC 16 Valve; 1) tape player makes noses and won't eject adapter I use to play music thru my phone. Also can't use my last station pre set button because...

Sounds like you have had a lot of fun with this rig
#1 - replace the stereo - that's cheaper than sending yours out for repair.
#2 - Make sure your cooling system is full. You can get an air lock/bubble in the heater core that is really difficult to resolve sometimes. When the cooling system starts to get low on coolant - the heater core is the first to get starved. Physically feel the temperature of the heater hoses at the firewall - they should both be hot - if one is hot and the other not - there is a restriction in the heater core. If neither are hot - your coolant level is probably low. With the engine running you can pinch the upper radiator hose which should force flow through the heater core. Try those things - if you get sufficient heat from other modes - i.e. DEF VENT then your coolant level is not an issue. your controls are your problem - and is this a Auto Temp control system (digital) or manual?
#3 sounds like the ground circuit for Pass side Brake light is not sufficient. Works OK until the park light is turned on. I presume a bulb from the drivers side that worked ok doesn't on the pass side (known good bulb) - the ground circuit needs repair.
#4 the illumination issue - Dash lights/buttons/switches - all those should illuminate together (dimmer controlled)
Radio buttons - refer to #1
Console symbols - wiring connections for the bulbs
Dome lights working ok from rear doors and not the front - probably issues with the front door switches
that's a lot of different things for one car

Sep 09, 2014 | 2000 Dodge Stratus

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Run self test on heater control head 1999 grand marquis

sounds like maybe your dryer is plugged up .
follow the cold line with your hand .
or its working and the vent flapper is disconnected .
its the one that's tied to the front buttons / lever on front panel.
you should hear it switch between cold an hot as the flap closes opens. it will be definitely heard. it sucks vacuum an plops close/open.
more than likely you have a loose bad vacuum line/lever in dash.

Jul 10, 2014 | 1999 Mercury Grand Marquis

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Cruise control doesnt work the light doesnt even come on

Fuses are a great place to start, if not fuses the actual cruise control switch may be to fault. Rear heater do you get heat out the front and if so is there a fuse for a rear fan maybe a blower.. Let me know

Mar 28, 2014 | 2003 Dodge Durango

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I have an1988 Chrysler fifth avenue. It has a miss, when you pull up to stop sign or red light it will stall out and die but starts right back up, sometimes back fire through carb if you hold gas throttle...

Check for a vacuum leak under the hood. Most heater and a/c systems rely on vacuum pressure to open and close doors and direct hot and cold air. The vehicle stalling could also be that vacuum leak. Look for a small diameter hard plastic hose. They always seem to dry rot, if it's bad it will fall apart when you move it. Best way to find a leak is to use a 2'-3' piece of water hose. Put one end against your ear to listen for vacuum leaks while the engine is running.

Nov 13, 2013 | Cars & Trucks

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No heater controls no blower or ac fuses good 89 jaguar xj6

My 93 xj6 doesn't blow or anything but I found that if I kick the blower under the string wheel. It comes on. Then it's blowing cold on the dash and hot out the center counsel. Where do I kick to fix that? There are buttons that light up by the steering wheel. That look like the seat heater button. Is there a way to choose to make the thing blow cold in front and hot in back? 989-657-2563

Jun 27, 2012 | 2001 Jaguar S-Type

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1998 gmc surburban. front blows 82 degrees, rear blows 48 degrees. ambient is 91 degrees. this is with max-recirc-full tilt.the valve for the heater core does not change position no matter where i put the...

Hi John,
Your right with your diagnostics, you have a blend door problem. If your switching to cool air and it is still hot then you also have a heat exchange unit fault, this is the component that changes the water flow from hot to cool by shutting off. If it is not operating correctly this will give you constant hot air no matter where you temperature switch is positioned.
As for the warm air while the engine is cold, sounds like the blend door is still open to atmosphere tempreture and if it is hot outside will pull that hot air into the inside of the vehicle.
Have the heat exchange valve checked, and the only way the check blend door operation is to remove the wiring from the blend doors and have the circuit tested. If the circuit is ok then the blend doors will need to be replaced.
Hope this helps

Jul 24, 2011 | 1998 GMC Suburban

1 Answer

No front heat. it only puts out cold air

1st check all your fuses ..then make sure the vehicle is cold before checking the radiator ensure it is full and after starting it it may drop then add fluid as needed ...check for circulation after this is done reinstall the cap
2nd make sure the fan and heat are on full speed and select hot fully..with the hood still open check with your hand both hoses going onto the {HEATER-CORE} " Not the radiator hoses" they're the 2 going into the firewall ....if the top is hot and the bottom is cold then the heater-core is plugged and needs to be flushed ..if they are both cold it s most likely a faulty water pump
however if both are hot you may have a pinched vacuum line under the dash to the controls the system to change from hot to cold etc..also there is a cable that controls the opening of the door itself but this most likely don't apply sorry just going through it in my mind ...ok also there is a posibility the switch is bad which case requires removing the switch to test it so then 1st check your fuses

i would also make a visual inspection of all the vacuum lines to ensure they are not dry-rotted or missing can check them by bending them if cracked or fall apart in yer hand then of course replace them

check the temperature gauge if it is not cooling then the thermostat needs changing ..just a note on that one

\ also note while under the dash and use a light and possibly a hand held mirror to better view things check and work the switch as wel as the lever if so ot the temperature control and watch and seee that they are working properly ...........

but this is a few areas to start with please rate me if it is at all helpful ...Thanks

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98 ranger 4x4 dash lights went out and heater control lights also


Sep 02, 2009 | 1998 Ford Explorer

1 Answer

2001 nissan sentra gxe dashboard lights not working

Nissans like most all cars and light trucks made for sale in north America the taillights dont work either if the dash lights are out. Tailights work go to next step, or fix tailights (parking lights) The fuse blown for the parking lights can happen at the radio and is common problem with aftermarket radios hooked up wrong. If The car has an after market radio and the fuse for dash or tail is blown I check the radio first unplug and look for loose bare or untaped wires see if a new fuse holds with the radio hang and then unplugged. Always use the right fuse as the headlight switch can't take a bigger load and you may not find the problem till you have a fire. The tailights are next if their out I just unplug the wire from the light fixtures and try a new fuse if the dash works now with it on plug the tailights in one at a time and watch operation If the bright light (brake bulb comes on the bulb is in backwards ( see it all the time ) or doesnt light at all or dash goes back out fuse blows again You found your bad light and the bulb the socket are suspect. with it apart You can see the problem. Lets say the tailights work just right. and the dash lights still don't work. Theres a dimmer for the dash lights that can fail. its' a thumb knob deal that pops right out of the dash with a light pry and will hang by its wire ( 3 ) with the lights on two wires will be on if only two wires both will be hot cold with the lights off. if it has aground wire its because it lights up too. the grong wire is black. Connect the other two wires together or if two wires connect them and the dash lights up you have a bad switch. You can plug in a bebt paper clip tape over and reinstall or order up a new one from Nissan as the parts stores mostly don't have these. Call with your VIN and the parts guys are more friendly. Still no good. The headlight switch can fail but you'll say the tails don't work and the fuses are good and they were good when you checked them. With the covers removed from the steering colum the turn signal head light switch can be removed. Most of the time they fail after big fuses were added or lots of miles and tailight or radio problems. Most always created by a wrongly directed repair. Find the wire thats the same color as the wire you saw on the back of the dimmer switch for the panel and with a test light see if it comes on ( switch removed but hanging by the wire and the wire plugged in ) With the switch turned off two or three wires will be hot turn the parking lights on only and one more will come hot ( check with test light ) turn the lights on bright another wre comes hot switch to dim another wire comes hot and the one that was hot on bright goes dead the other two wires are the turn signals they need to work before your done as long as the lights work OK don't go diging into sonething thats not broke. Key off two wire hot one more with the key on (turn signal) if not good here your back to checking fuses The front lights can also short out as the car may have hit something. all the marker lights ( edge of the headlight ) Sides of the front and rear fenders and all the lights in both tailights are suspect. Last the wires that go to the lights are damaged somewhere. Theres lots of bulbs in the dash, glove box, ash tray, Speedometer, heater control and console gearshift. The likely hood of all being blown is unlikely. Power put on the panel dimmer switch will find out.

Aug 11, 2009 | Nissan Sentra Cars & Trucks

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