Question about 1990 Toyota Pickup

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Air conditioning unit not engaging

Hi, my in-dash air conditining switch turns on but only warm air comes in. No cool air is coming in. Unit is not engaging. Can anyone help? thanks.

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  • george4199 May 11, 2010

    either you have a vacuum hose loose or the cable that swap between the heater & A/C is bad

  • Toyota Ed May 11, 2010

    Have you checked to see if there is any freon in the system?

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  • 8 Answers

Your air conditioning system needs recharged. im sure of it.

Posted on Mar 20, 2009

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Air conditioning problem


Air Conditioning problem
2004 Chevrolet Impala



Ac is not blowing out cold air. You have to put gages on the system and it shows its has freon.Checked all fuses and relays. The two fans in engingine compartment do not come on when the ac is turned on but does when the engine gets hot. The compressor engages when turned on also.
If the magnetic clutch engages the compressor and still no cold air could be still low in freon or the HVAC unit.

Blower motor not working all the time...if I bang the dash near the glove box, it comes on then works great. Is this the switch assembly, the resistor problem, or should I be replacing the blower motor?


Jun 04, 2013 | 2004 Chevrolet Impala

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2003 Ford Excursion 6.0L diesel. A/c blows warm air, compressor was recently replaced and serpentine belt, AC was recharged, condenser, orafice tube. Fuses were checked and it still blows warm. I put it...


Check that the heater is turning off as the hot air will over come the cool air. Check that the clutch on the a/c pulley is still engaging as it the unit was over filled or has a leak from a badly fitted pipe the high low switch will not allow the compressor to work.. If the work was done professionally check that the correct gas was used and seek warranty for the problem.

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1 Answer

Air conditioner comes on comes out hot


the belt driven aircondisioning unit is located under the hood. there are usualy metal lines coming off of it and one should have a valve in it ...looks like a tire,air valve. when car is running, turn the AC on. the unit has a two part clutch that the belt will turn. when the AC is off...the pump or compressor will engage and the hole belt driven piece will rotate when the AC button is on. , when it is off....or not getting power to the clutch , the pully will spinn but the inside clutch will not.

iff the unit engages and turns when the AC is turned on, and still blows hot air, then you may have a leak in your refrigerant line. iff it dosnt engage, then check your fuses .if everything is good to go..then it is mostlikly a vacume issue located in the dash behind the AC switch and display that moves the vent from hot to cold....

Jun 08, 2012 | 2003 Chrysler Town & Country

1 Answer

Hi, The air con in my 2003 Audi A6 1.9 tdi 130 is blowing warm air the air con rad is fully gassed and all fuses are ok . Thanks in advance for any advice on how to fix


The only other thing then would be if the compressor is turning, engaging, and the cooling fan working properly. You should either be able to see the compressor clutch engage, as the switch is energized, or at least hear it click loudly when the switch is energized. If it is not, then there are sensors for the low pressure/high pressure line to tell the compressor when to function, that also have to be checked.

As the engine runs with the compressor turning, one line should be hot/warm, the othe,r (larger diameter hose) should be cool/cold, if the system is working properly.

If the compressor is turning when you have the A/C turned on, then see if the cooling fan is running as well. It must run to remove the heat and cause the process to function properly.

Good luck!

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1 Answer

AC unit blows cold on passenger side and warm on driver side.


Hi,
There are separate blend doors for the passenger and driver's side. The blend doors divert, not block air, so it is unlikely that the blend doors are the problem. You need to check the operation of the re-circ door.
There may be some more duct work that attaches to the heat/air conditioning housing under the dash, that supplies air and or heat to both the driver side and passenger side of the car, the duct work on the driver side may have come disconnected.Check this also.
Hope this helps
Thanks
Smith.

Sep 11, 2009 | 2008 BMW 528i Sedan

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Problem with the Air conditioning unit 2005 toyota avensis


if its cold at 1 location all the time its probably got its gas maybe theres a vent not opening or a duct that has come adrift under dash,if its not cold in general you may need to get an AC guy to look at the fault but keep looking if you think something is simple to fix

Aug 16, 2009 | 2005 Toyota Avalon

1 Answer

A/c stopped working,the clutch still engages, fan blows warm, found no fluid leaks


the air blend door inside the heating / cooling unit that sits under the dash is probably not moving. there is an electric motor and control unit that moves the air blend door (assuming you have the electric dial or push button digital controls. some of these vehicles have a valve that shuts off the antifreeze from cycling through the heater and if it remains open then you would get "not hot" but just warm air.

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1 Answer

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1st Thing,
Located Someone With a Set Of A/C Gauges 134A Freon,
Make Sure Your A/C System Has Enought Freon In It, There Is a Low Freon Pressure Switch
In The Electrical System, Usually, 50-60 PSIG or Less On The Gauges, Will Indicate Low Freon, When Freon Is Low The Compressor Is Dis-engaged To Prevent Compressor Damage.
1] Low Freon
2] Bad Low Pressure switch
3] Blowen Fuse[s]
4] Electrical Problem[s]
[a] Digital Climate Controlled ?
Climate Control Self Diagnose From Button's On Unit, OEM Manual Explains This,
If Yor Auto Has Digital Climate Control.
5] Bad Compressor DC Coil

Note: Does The Compressor Engage, Click-On When Button Is Pressed, But Getting
Only Warm Air?
Is One Of The Compressor Aluminum Tube's Cold, Be Careful Other Is Really Warm/Hot,
If Cold and or Sweating, Dripping Water [Normal], You Are Blending Hot Air w/Cold
Air At The Heater Blend Box, Making Warm Air.
If This Is So, If A Vaccum Controlled Temp Unit, Check For A Vaccum Hose Bad,
Should Be Either 1or 2 Vaccum Lines Going Into Firewall To Feed The Controller
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If Your Auto Is Vaccum Controlled, Can You Changed From Bottom, Dash,
Defrost Air Flow?, Yes, No Vaccum Lost Feeding Controller, Still Might Have
Bad Diaphram Blending Hot Air w/Cold If Your Have Cold Alum-Tubing In
engine Compartment.
If Digital Climate Controlled, Might have Diaphram's, Vaccum Controlled or
electrical Servo's Controlled vs Diaphram [Vaccum] Controlled.
This Might Help, Hopefully, This Is Just For Starter's, There More To Some System's
and Without The OEM Mgr's Manual[s] You/Be Would Be Lost, especially w/Electrical.
Later, God Bless

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3 Answers

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Re:- the buzzing behind the dash:-
Its tiny a fan which carries on running in humid conditions to circulate the air so you dont get blasted by warm air when you use your climate control.It circulates air across the humidity sensor. It keeps running for a while after you switch off, and starts again when you open a door. It does this so that there is less delay in getting the climate control to the right setting when you switch on (or restart).

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1 Answer

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