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Can't find any place that sells the vacuum actuated heat defrost control units help?
Wiki User
∙ 14y ago
try your local junkyard
Wiki User
∙ 14y ago
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Why would a car shake if the heat is on?
A good place to start is to check for leaks in the vacuum lines associated with the heater controls. Many of the controls are vacuum actuated & if there is a leak in a control or associated line it may cause a rough idle
Why will air only blow out the defrost on S10 blazer?
You have a vacuum hose disconnected or broken. Check under the hood for a small vacuum hose out of place or broken.
Ac not blowing throw the vents in a 1996 Chevy lumina?
Check the floor heat vent and defrost to see if air comes from them. The vents will be vacuum controlled and a vacuum leak will make the vent doors divert air to the wrong place. Check the entire engine and climate control systems for a vacuum leak.
How can you fix your heater in a 1996 jeep Cherokee the air and heat will only come out from defrost no matter what the selector is on?
The mode door is vacuum controlled in the GC and the default fail position is defrost only. You most likely have either a vacuum leak or a broken vacuum line. There is a vacuum junction under the passenger side dash that kids like to kick and pull the vacuum line loose. That's the first place to check.
How do you fix your Air Conditioner on a 1995 S-10 Blazer The only place you am getting air is out of your defrost vents?
a guy told me that the vacumm relay swith is out, I trying to find out where it is located. Help, Roy Rutland The vent controls are operated by vacuum. When the vacuum supply is cut off the system automatically goes to defrost mode. My guess is you have a broken, pinched or disconnected vacuum supply line under the hood. Inspect the small vacuum lines that go from the engine to the firewall. I believe that vehicle has a black plastic vacuum reservoir attached to the underside of the hood, be sure all the vacuum lines to and from it are connected and in good condition.
Why would a 2003 Dodge Ram 1500 not blow air on the floor and if you place it to floor it blows out the defrost only?
VACUUM LINESI have the same problem with my Trailblazer. I keep reading that is could be the Vacuum lines, or some card that is on the back of the controls.... GOOD LUCK LET ME KNOW IF IT WORKS>>>> I have an 03 3500 dually and had a similar problem. The vacuum line was disconnected. The vacuum pump is usually on the right side up near the fire wall close to where the a/c ties in.
How to fix Windstar heater air control that is stuck in defrost?
I just finished looking at this problem on my 1998 Windstar. The air ducts are vacuum operated. The short answer is that by sealing off the lines that run to the rightmost switch on the heater control panel (the one that controls heating and cooling in the rear of the van), it cleared up the "stuck in defrost" problem. To test the solution, I unplugged the two-line vacuum connector at the back of the switch and put a piece of electrical tape on the connector to seal it. The long answer follows below:The rest of these answers are correct that a vacuum leak can cause this problem. I have not looked upstream of the switches (into the engine compartment) for any leaks there, but my jury-rig at the rear fan control switch worked. There are two vacuum diaphragms that control where the air flow goes (defrost/vent/floor). These are located by your gas pedal and the center console, and are silver colored metal canisters about one half the size of a soup can. I sucked on these with a vacuum hose and they re-directed the air fine and held vacuum fine, so they were not the problem.Moving upstream from the vacuum diaphragms there are 6 vacuum lines in the back of the main heater control switch. One of these lines is black, and is a vacuum source (ultimately from the engine). This black line has a tee in it right behind the switch, and another black vacuum line runs from that tee to the rightmost switch on the console (which controls heating and cooling in the back of the van). That switch has just two vacuum lines to it. The black source line, and the white outlet line. I removed that two-line vacuum connector from the rear of the switch, put a piece of electrical tape over the holes, and now the main heat selector switch directs the air properly to the defrost, vent, or floor. That rightmost switch may be bad since I could hear a vacuum leak in it, and moving the switch to different positions or pressing on it could stop the hissing. It is also possible that the connector leaks, but since moving the switch changes or stops the hissing, it is most likely the switch itself. The only other possibility is that if there is low vacuum to the switch in the first place, it could cause the switch to leak. I will check that further.AnswerThere is a vacuum switch that controls an air gate that diverts the air flow to the proper outlet. Blowing air out the defroster is the default setting of the switch. Most common causes of this problem are vacuum leaks. Check the vacuum hose on the passenger side engine compartment first. It usually leaks going through the fire wall. Regardless this problem is most often always the result of a leak somewhere in the vacuum system not the failure of the switch itself.AnswerI would say that something is binding or broken with the blender box unit. It is the mechanism that allows mixing of the different air settings and is located behind the dash area or under the passenger side area. Hope this helps.AnswerOn my '98 Windstar, this behavior was the result of a vacuum leak; the HVAC modes are vacuum-actuated.Answerchange the a/c - heat selector switch.More likely than not you have a vac leak there are to vac lines that run out of the firewall behind the glove box one is red and the other is black trace them out and you will find the leak probably real close to the nipple on the manifold.AnswerCheck for a vacuum leak either under hood or under dashCheck vacuum actuatorsDefrost is the default setting for this systemAnswerThe most likely is the vacuum line used to operate the swinging doors to redirect airflow is broken or not in place.You have a broken or disconnected vacuum line that feeds the HVAC (heating, ventilation and air conditioning) system, probably under the hood. When ever there is a loss of vacuum, the system reverts to the defrost mode being the most important mode.AnswerYour problem can be caused by either a defective heater control switch or more likely a vacuum leak. The leak can be in the vacuum supply tube to the heater control switch or at the engine where the supply tube originates or the vacuum reserve (usually a plastic ball in the engine compartment with two small vacuum lines attached).
VW Jetta ac blows hot air when accelerating?
This is most commonly caused by the air control doors closing. This system is vacuum controlled. When acceleration the engine is pulling less of a vacuum and any leaks will cause the doors to move to the "rest" position where they stay when there is no vacuum. Checking for vacuum leaks would be the first place to start.
Your 99 ford windstar ac front panel only blows through defrost area no matter where you place the selector The selector for the rear of the vehicle works good What is the problem?
so far everyone points to actuator blender failure but check for vacuum leaks first
What is a place where there is no matter or air?
A vacuum
Can convection takes place in vacuum?
No
Why does your heat only work on defrost in a 99 Jeep Cherokee?
look under dash. see if a cable or a vaccum hose has popped off. hope this helps Actually, there are two vacuum lines to check. On is under the dash on the left (driver's side) of the transmission hump connected to an actuator. The other place is a hard plastic vacuum line that runs from the dash control, through the firewall into the engine bay. It's near the washer reservoir and continues along the passenger side fender to a vacuum canister behind the bumper near the corner (passenger side). Sometimes that hard plastic tube develops cracks. It's not hard to replace.
