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1998 chevy blazer heater problems. wont switch from defrost to floor. stuck on vents right now. how do I fix this problem.

This started with not being able to change to the floor. would change from vents to defrost now it is stuck on vents only.

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Your mode actuator is the part you need to replace. Is located on driver side under the dash. is not the easy job but with the right tool you will get to the 3 screw and remove the old one. Next select different position on the gear and insure is moving free and air change to defrost and floor.install the new one.
good luck

Posted on Dec 02, 2014

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Most likely either the vent switching mechanism is dirty and won't switch the flaps -or- most likely the vacuum that is used to turn the vent flaps is either leaking and not pulling enough vacuum. You will have to get underneath the dash near the center, to check and see if you can manually move the vent flaps. If so, then most likely it is a vacuum leak in a vacuum line to the flap mechanism.

Posted on Dec 02, 2014

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Posted on Jan 02, 2017

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SOURCE: heater control 98 chevy s10 blazer

These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.

Posted on Dec 13, 2008

morse008
  • 1111 Answers

SOURCE: 1996 chevy blazer my air on heater will not blow

the idea of the switch is run on vacuum and is not making contact with the switch it self either worn contacts in the switch itself **** as an obstruction as well or the vent door is stuck in just that position either behind the glove box or the ash tray are the vacuum lines one of them may be pinched off or the door needs a bit of help until you can free it up

Posted on Sep 08, 2009

  • 1584 Answers

SOURCE: 1998 chevy monte carlo , can not switch

Problem is in the vaccum feed pipe (Cracked) or the actual control panel.

Posted on Mar 10, 2010

  • 269 Answers

SOURCE: my vent is stuck on floor position and heater

The thing to do is check for vacuum leaks. In the engine bay look for any "hoses" coming from the firewall. These are for the heater contols. If any of these are broke? Replace them . Have you installed a after market radio? Sometimes heater controlls get messed up. I would take the radio out and examine the heater controlls.

Posted on Jan 10, 2011

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1 Answer

2003 chevy blazer heat won't blow on floor


Transfer case switch may be bad allowing trans fluid in vac. Lines and can reach as far as heater switch common problem fix these all the time 17 bucks for tranfer case switch and 20 foot of vacume hose and replace all the vac. Hose because this issue causes pcv to not work correctly so the moisture from crank case ends up going out the distributor vents causing cap and rotor corrosion there is service bulletin to remove distributor vent screens i would fix that since you will be working next to it any way

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1 Answer

1998 blazer heat works great but defrost doesnt, could there be a blocked hose and how do i check?the defrost at the front wont blow.


if you have heat and nothing blows on defrost then this is a mode door problem that is not changing from floor to vent to defrost mode.it could be the mode switch or the mode door not working.the mode door is on the air duct under the dash and you can manually move it when you disconnect the control with your hand it should move freely.some of these have a small motor that moves the door.and if you move the switch in different modes or better have someone move the switch while you see were the door is the one that is moving is the mode door.if it won`t move on defrost tap the motor and see if it starts to work.if it does then it will have to be replaced if not it could be a switch problem.

Oct 26, 2011 | 1998 Chevrolet Blazer

1 Answer

Ac wont come thru vent on 97 chevy blazer. ac will come out thru defroster and sometimes the floor vent but it isn't coming out of forward vents


Check the vac lines for leaks on the drivers side rear of the engine compartment. The ones going to the vac ball attached to the hood.

Jul 10, 2010 | 1997 Chevrolet Blazer

1 Answer

1998 chevy monte carlo , can not switch


Problem is in the vaccum feed pipe (Cracked) or the actual control panel.

Mar 10, 2010 | 1997 Chevrolet Monte Carlo

2 Answers

Heater problem, not very hot & not switching from defrost to floor


either the AC\Heater panel switch on your center dash or the heater box vent door is stuck or not operating. Most likely panel switch or disconnected \ broken vacumm lines at back of switch

Jan 13, 2010 | 1996 Chevrolet Blazer

2 Answers

1996 chevy blazer my air on heater will not blow


the idea of the switch is run on vacuum and is not making contact with the switch it self either worn contacts in the switch itself **** as an obstruction as well or the vent door is stuck in just that position either behind the glove box or the ash tray are the vacuum lines one of them may be pinched off or the door needs a bit of help until you can free it up

Sep 08, 2009 | 1996 Chevrolet Blazer

1 Answer

WILL NOT SWITCH AIR FLOW STUCK IN DEFORST VENT


when your car is in defrost it has an ac cycling it removes the moisture then sends the air over the heater core depending on how warm you set it you can feel warm or cold but the ac is always cycling...ridding the moisture...you need a good ac tech it will be okay...its just expensive going into the heater core if needed...!

May 07, 2009 | 2000 Chevrolet Astro

2 Answers

Heater control 98 chevy s10 blazer


These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.

Dec 13, 2008 | 1996 Chevrolet Blazer

4 Answers

Vacuum leak


i would say its in the dash unfortunately you will have to pull it out to inspect.

May 25, 2008 | 1996 Chevrolet Blazer

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