This happend to mine, so Im guessing you have the same problem. Under the hood and in the back, along the firewall. Close to the top and middle you will see a vacuum tree. Check there for any of those lines having a tear or just came off. One of my hoses had dry rotted. An air leak there will cause your defrost to not work
on the intake
In between the air filter and the raditior
Were is the ac drain on a ford tempo,
You can find the air conditioner fuse for your 1990 Ford in the fuse box. The fuse box is located beneath the drivers side dashboard. The fuse box will also contain an air conditioner relay switch.
The adjustments are made automatically by this cars computer and can not be changed or adjusted. Should be 14.7 to 1
The Ford Tempo Air Conditioner service port is located in front of the hood latch. The low pressure service port is closest to the firewall.
It doesn't have one
Yes.I have a 1994 Ford tempo GL with a 2.3l engine, automatic transmission, air conditioning, power locks and tilt steering.
On my 1995 Ford Explorer when the defrost position is selected , and the temperature knob is set in the red area to get heated air to defrost the windshield , the A/C compressor will cycle on and off to help dehumidify the air, but the compressor ONLY cycles on and off in the DEFROST POSITION ( sorry if I'm misinterpretting your question )
There is no A/C defrost relay. The defrost mode of the heating and air coditioning is a default mode whenever the system is not operating as it should. It automatically goes to defrost mode when the system is not operating as it should.
When you select the defrost setting , the air conditioning compressor will kick in and out to help dehumidify the air , that's normal to hear the compressor kicking in and out
You have a vacuum leak causing your vents to switch from dash to defrost.
replace the heater core
The first answer is correct and heres where the leak most likely is. Under the hood, against the back firewall close to the middle, you'll see a vacuum tree. Several hoses plug in here. Both the Tempo and Topaz I've had this happen to, occured here. Look for a unplugged hose or a cracked or dry-rotted hose and replace as needed. Defrost is the AC/heat system's default position. Likely you have lost vacuum to the control head. When there is no vacuum to control the functions then it will default to the defrost vents.
Your Ford F-150 has a what? Explain it a little more there buddy. I have a vacuum leaks that causes my air conditioning to go to defrost
if it is between the air cleaner & the throttle plate it is the mass air flow sensor.
Hi, It is not the blend door, that is for heat/cold changes. The mode door could be the problem, or stuck defrost door.
Check the blend door under the dash on the F150. Check the vacuum system as well. The vacuum controls the blend door and controls the heat as well as air from the defrost.
The air filter in a 1990 Ford F 150 is usually found in the rear end of the engine on the passenger's side. This is close to the oil filter.Ê
every 5 to 10 thousand miles
Works best with a air impact tool. There is room.
Perhaps a stuck door in the HVAC system or a blockage in the ducts.
The 1990 Ford E1 50 air conditioning compressor relay is located in the fuse box. The fuse box can be found in the engine compartment.
4 to 6 hours