Having problems with your 1999 Chevrolet Blazer ?

Switching from heat to defrost,still getting air coming out of vents

Posted / edited by AnonymousUser on : 15-01-2018

Answers :

I have the same proble3m with my 01! with your car at idle do you hear a hissing noise coming from behind your vent controls? if you do you have a bad vacuum plungger on your heater nox under your dash! there are 3 of them to check one you can see behind glovebox and the other two are under bottom part of dash. you should be able to see them if you take off lower panel. the pluggers hold and push the doors inside of the hater box i bet one of those are bad! when you get them off the way to check them would be put your finger over the hole(off the truck in your hand) and they should stay still if they move still is bad a should be replaced
Vacuum hose may have came off
Repair Help & Product Troubleshooting for 1999 Chevrolet Blazer

Tips for a great answer:

- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.

Suggested Questions/Answers :

Dodge Grand Caravan 2005. A/C wont blow air in the front vents but the back is fine. Defrost (top of dash and bottom vents by feet) work fine on cold or heat. But when I try to flip the switch to head vents there is slight breeze of cold air coming out and a whistling sound. Almost like a flap or something gets stuck when switching positions. Is this a fuse problem? Or something to do with the blower or resistor? Thanks in advance for any insight!


... 2005 Dodge Grand Caravan

Need to replace actuator motor on 2003 Ford Explorer XLT and need to know how to remove the dash. I am getting a clicking noise when I switch from heat to air. The heat still comes out of the vents. Air won't come out.


... Ford Explorer

Hvac problem with 04 montana Switch my temp control knob to hot, and my air flow knob to mix front vents and floor vents, and I get hot air out the floor and luke warm air out the front. Since I don't have rear heat this is not enough to warm rear passengers. Turn my air flow knob to only front vents, air flow and temp increase but not enough to stay warm. Switch my temp control to cold, and I get cold air out the front but luke warm air out the floor vents. My feet get hot in the summer. Any i


... 2004 Pontiac Montana

On my wifes 2004 yukon, the engine warms up and the blower works fine, but it takes forever for the air to finally blow warmly. when it finally does, if we switch it to another location (floor or defrost), it starts coming out cold again. things that work good: engine heats up good. blower works good. switches between floor, vent, def good. same for back of vehicle. only problem is getting it to come out warm after you set it to warm.


Iwould check the selector motor,and also replace the thermostant,start with the stant first,the selector motor is what runs the door for hot or cold the motor is a common problem,if the temp gauge is showing a quick warm up temp then its the selector ... 2004 GMC Yukon

Heater control does not work heat always comes out of dash vents no matter what the setting. no defroster, no foot level heat. how do I get to the air diverter that changes the direction of air. the switch seems to be working based on lights for recirculation etc.


Your mode door sounds like it is not moving\015\012the air distribution is control by an actuator(motor) that sits on top off a door that moves to distribute air flow to whichever setting you set it to-if the door is broken it will no longer mo ... 2004 Subaru Outback

2005 Nissan Xterra Air Conditioner Problem. Worked fine all summer then all the sudden I can not get my AC switch to come on. If I put the climate control switch to MAX and turn the blower switch to possition "1" the AC & Recirc Air lights comes on but the blower does not come on. If I quickly turn the blower switch to 3 or 4 I get a blast of cool air for about a second but the lights AC & Recirc go off and the AC light will not come back on when pressed. Heat seems to work fine except when the


... 2004 Nissan XTerra

Heat is coming out of the passenger side middle seat floor vents when the a/c is on with the rear reostat switched on. Does anyone know what could be the problem? I do get heat out of the heater vents when the heat is turned on but also get heat ( a very slight amount) coming out of the heater vents when the a/c is on the rear reostat.


I think you should diagnosis of cooling electronic. ... 1998 Plymouth Grand Voyager

I own a jaguar s-type v-6. When the car is parked out in the heat and I turn the air on, the air from my vents comes out warm, as I drive the car it gets cooler. I think my fan is not working. If this is true, do I have to replace the whole fan assembly or just the auxiliary fan switch


Hi!!\015\012\015\012If the air gets colder on your side as you accelerate, it could mean that the blend door actuator (the one that controls the outside air entrance) could be faulty\015\012\015\012 ... 2003 Jaguar S-Type

Within the past year I had the heater coil replaced and the blender door because I had heat in the back but not heat in the front.. Afterwards I had heat and air for a few months only. Now I only have a little heat coming from the tiny vents at the top of the vent but nothing coming from the vents.No heat either. Cold air in the back. Also I only get the tiny bit of heat after it has idled for 15-20 min.


It sounds like the blend door motor is failing or is stuck. You could go to mitchell1diy online to diagnose this and for the instructions to remove the dash. Plan on spending a day or two on this if you have never taken a dash out before. ... 1999 Ford Expedition

Im having a problem with my heat coming out of my vents..the air conditoning will come out of the vents but the heat will only come out of the defrost...the passenger side gets hot and the drivers side blows cold air


You probably have a bad blend door actuator. the car has several. ... 1995 Cadillac DeVille

Have 1985 dodge ramcharger royal se 5.2L 318. A 30amp toggle switch had been wired to control the heaters blower motor and thats how I get my heat which is constantly on high. What part or parts should I get to put this in order? I purchased a heater control switch but I think I just bought the wrong part. When I push the defrost it pushes air through the defrost vents and when I hit the off switch air forces out the vents. I suspect an electrical problem but don't know the correct part terminol


Hello from cold Kentucky. The system uses a fan switch, resistor, and probably a high blower relay.In the high position, the switch powers a relay that powers the blower motor. Any lower speed goes thru the resistor. The resistor is on ... Cars & Trucks

2000 chevy silverado troubleshooting no heat. I have had in the fall either great heat or great air, but i couldnt switch during the day, overnight either would work fine. now i get great air but the heat just barley comes out, not even warm but i can tell the diff. between the two. expert online told me the lower actuator door was stuck, i replaced that. now i get great air and the warm is still slight. truck doesn't over heat is on normal temp. he said the lwer actuator was with the heat not t


Does this truck have dual climate or electric thermometer in the heat/ac control panel. if so the elec. therm. may be stuck and not allowing the temp to drop but so low in the truck therefore you get cold air but no heat because the therm. says it is ... 2000 Chevrolet Silverado

2005 Silverado 2500HD 4WD - It appears that the pneumatic valve controlling the directional air flow from my heater/AC is getting stuck. When I switch the fan to front window defrost then back to front/bottom no air flow comes out the front or bottom air vents - the flow is entirely out the upper defrost vents. If I drive over some bumps the valve loosens and air flow again comes out the front/bottom vents. How do I fix this??? Thanks


The default configuration when all vacuum fails is to defrost vents. Most likely your vacuum supply to the switch is weak. Check the connection of the supply line to the intake manifold for damage. If no problem there, trace it to the switch on th ... 2006 Chevrolet Silverado 2500HD 2WD

No heat and the defrost is the only place air will come out. Some time ago in the spring the a/c would not work then it started working but now the heat does not, and you get no get air flow from the vent or the floor it only comes out of the defrost portion.


Check fuse for blower motor, it is a 30amp fuse behind the plastic panel that is to the left of steering wheel, you must open the driver door, open up the fuse panel, I believe the 30amp is the only 30amp fuse in there, If it is blown replace it, the ... 2000 Dodge Intrepid

Switching from heat to defrost,still getting air coming out of vents


I have the same proble3m with my 01! with your car at idle do you hear a hissing noise coming from behind your vent controls? if you do you have a bad vacuum plungger on your heater nox under your dash! there are 3 of them to check one you can see be ... 1999 Chevrolet Blazer

The. Climate control display in my 2005 chrysler pacifica has gone out. It is stuck on air conditioner and only coming out if the vents and wont switch. Its getting to be winter and I need heat and defrost. I live in cleveland and have a 1 year old. Please help with any advice.


You need to see the dealer on this problem, it requires testing with special factory scan tools. The sooner the better as I think you will need the dash removed to repair the problem. ... Cars & Trucks

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 switch. When air conditioning is on hot air comes out of air vents eve if the hot/cold control is on cold when


One of your deflector door servos or the door itself, is hanging up. To determine this more clearly, run your vehicle for about two minutes and shut down the engine. Move your function selector knob from defrost to floor to panel and listen carefully ... 2002 Ford E250

On a 1999 Dodge Dakota, is the heat selector switch electrical or a vacuum switch. The truck in question has no heat coming out the floor register or no vent or air condition when you change the selector switch. The selector switch do not seem to change the out put from the floor the the vents to the defroster.


... 1999 Dodge Dakota

Can't get the switch for the air to turn over to heat and can only get air to blow out of one vent


Could the the control on the dash, or a stuck blend door under the dash. ... 2000 Nissan Sentra

03 honda element blower vents will not switch. Heat and air only comes out face vent. Control module works fine with switching blower gears visible through glove box access but does not change air to flow through different vent


... Cars & Trucks

Hot air comes out of the vents with AC on. Compressor on, suction line cool to cold. When you switch the control to "vent" heated air comes out of the vents.


... 2002 Mercury Grand Marquis

I have a 2000 Mercury Grand Marques LS, the air conditioner started blowing really hot air and couldn't get it to adjust up or down had to turn it off, then (after the weather cooled down) when I turn the heating up it won't heat either....it does defrost just a little bit and a little heat does come through the vent but that's it and I'm getting cold!


... 2000 Mercury Grand Marquis

Hello, I have 2000 Ford Mustang. When I turn on my air vents to get heat only cold air comes through. I'm not talking about turning on the air conditioning unit but I use to be able to get heat


... Cars & Trucks

I have a 1996 jeep GCL 5.2....coolant froze and now i get no heat in the truck..ive changed...thermostat, temp scen, water pump and the bypass hose.. i have flushed it a few times...now both hoses are hot but still no heat in the truck..i had a block check done and there are no ent leaks...im lost at this point. when i press the gas the cold air stops coming from the vent and only from defrost also but when i let off the gas it comes back out the vents


Try removing your a/c heat unit unplug it make sure all contacts are clean reconect an check, this has work for me on a few dodge vehicles with likely problem. ... 1996 Jeep Grand Cherokee

2 years ago I had the heater core replaced in my 99 Durango. now the heat is little to none. When the fan is on low and you are driving there seems to be good heat coming out of the vents, but when you stop or turn up the fan the air coming out of the vents gets cooler. I think it is the water pump, but my husband says if that were the case then the temperature gauge would go up. Please help!!!!! I am not a cold weather person.


Thermostat -stuck open ... 1999 Dodge Durango
  • Start your question with What, Why, How, When, etc. and end with a "?"
  • Be clear and specific
  • Use proper spelling and grammar
all rights reserved to the respective owners || www.carrestorationshop.com || Terms of Use || Contact || Privacy Policy
Load time: 3.2320 seconds