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2003 HEATER PROBLEM...AIR BLOWING BUT NOT HOT

 
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Old 30 Nov 2013, 10:44 pm
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Question 2003 HEATER PROBLEM...AIR BLOWING BUT NOT HOT

MY 2003 STANDARD 5 SPEED LIMITED ADDITION NON-TURBO PT CRUISER IS NOT BLOWING FREEKING HOT AIR..

WHAT IT IS DOING CORRECTLY:
AIR BLOWS STRONG
A/C WORKS FINE
BLOWER SPEED KNOB WORKS FINE
MODE CONTROL KNOB WORKS FINE
OUTSIDE AIR/RECIRC CONTROL KNOB WORKS FINE

WHAT IT IS NOT DOING CORRECTLY;
TEMPERATURE CONTROL KNOB DOESN'T CHANGE THE TEMPERATURE.

I AM THINKING THAT THE TEMPERATURE CONTROL KNOB IS NOT MOVING THE DUCT "DOOR" TO DIVERT THE AIRFLOW ACROSS THE HEATER CORE CORRECTLY. THATS MY GUT FEELING.

SO DOES ANYONE HAVE ANY EXPERIENCE WITH THE TROUBLE SHOOTING OF THIS TYPE OF PROBLEM AND HOW TO REPAIR?

ALSO, WHERE CAN I FIND A SERVICE REPAIR MANUEL AND PARTS MANUEL FOR THIS 2003 PT CRUISER? LOOKING FOR A DETAIL DIAGRAM OF HOW THIS THING IS PUT TOGETHER.

THANKS FOR ANY HELP IN ADVANCE FROM YOUR MOST NEEDY NEW MEMBER..

MERRY CHRISTMAS,

MIMS
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Old 30 Nov 2013, 11:00 pm
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Default Re: 2003 HEATER PROBLEM...AIR BLOWING BUT NOT HOT

Quote:
Originally Posted by howardmims View Post
MY 2003 STANDARD 5 SPEED LIMITED ADDITION NON-TURBO PT CRUISER IS NOT BLOWING FREEKING HOT AIR..

WHAT IT IS DOING CORRECTLY:
AIR BLOWS STRONG
A/C WORKS FINE
BLOWER SPEED KNOB WORKS FINE
MODE CONTROL KNOB WORKS FINE
OUTSIDE AIR/RECIRC CONTROL KNOB WORKS FINE

WHAT IT IS NOT DOING CORRECTLY;
TEMPERATURE CONTROL KNOB DOESN'T CHANGE THE TEMPERATURE.

I AM THINKING THAT THE TEMPERATURE CONTROL KNOB IS NOT MOVING THE DUCT "DOOR" TO DIVERT THE AIRFLOW ACROSS THE HEATER CORE CORRECTLY. THATS MY GUT FEELING.

SO DOES ANYONE HAVE ANY EXPERIENCE WITH THE TROUBLE SHOOTING OF THIS TYPE OF PROBLEM AND HOW TO REPAIR?

ALSO, WHERE CAN I FIND A SERVICE REPAIR MANUEL AND PARTS MANUEL FOR THIS 2003 PT CRUISER? LOOKING FOR A DETAIL DIAGRAM OF HOW THIS THING IS PUT TOGETHER.

THANKS FOR ANY HELP IN ADVANCE FROM YOUR MOST NEEDY NEW MEMBER..

MERRY CHRISTMAS,

MIMS
Pull your dash apart and change your heater core.... If all the knobs seem to function properly... Not much else it could be. Maybe wait for a second opinion but I 99% on this one.
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Old 30 Nov 2013, 11:14 pm
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Posts: 30
Default Re: 2003 HEATER PROBLEM...AIR BLOWING BUT NOT HOT

WHAT IT IS NOT DOING CORRECTLY;
TEMPERATURE CONTROL KNOB DOESN'T CHANGE THE TEMPERATURE.

I AM THINKING THAT THE TEMPERATURE CONTROL KNOB IS NOT MOVING THE DUCT "DOOR" TO DIVERT THE AIRFLOW ACROSS THE HEATER CORE CORRECTLY. THATS MY GUT FEELING.

SO DOES ANYONE HAVE ANY EXPERIENCE WITH THE TROUBLE SHOOTING OF THIS TYPE OF PROBLEM AND HOW TO REPAIR?

ALSO, WHERE CAN I FIND A SERVICE REPAIR MANUEL AND PARTS MANUEL FOR THIS 2003 PT CRUISER? LOOKING FOR A DETAIL DIAGRAM OF HOW THIS THING IS PUT TOGETHER.

THANKS FOR ANY HELP IN ADVANCE FROM YOUR MOST NEEDY NEW MEMBER..
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Old 30 Nov 2013, 11:20 pm
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Default Re: 2003 HEATER PROBLEM...AIR BLOWING BUT NOT HOT

Quote:
Originally Posted by howardmims View Post
MY 2003 STANDARD 5 SPEED LIMITED ADDITION NON-TURBO PT CRUISER IS NOT BLOWING FREEKING HOT AIR..

WHAT IT IS DOING CORRECTLY:
AIR BLOWS STRONG
A/C WORKS FINE
BLOWER SPEED KNOB WORKS FINE
MODE CONTROL KNOB WORKS FINE
OUTSIDE AIR/RECIRC CONTROL KNOB WORKS FINE

WHAT IT IS NOT DOING CORRECTLY;
TEMPERATURE CONTROL KNOB DOESN'T CHANGE THE TEMPERATURE.

I AM THINKING THAT THE TEMPERATURE CONTROL KNOB IS NOT MOVING THE DUCT "DOOR" TO DIVERT THE AIRFLOW ACROSS THE HEATER CORE CORRECTLY. THATS MY GUT FEELING.

SO DOES ANYONE HAVE ANY EXPERIENCE WITH THE TROUBLE SHOOTING OF THIS TYPE OF PROBLEM AND HOW TO REPAIR?

ALSO, WHERE CAN I FIND A SERVICE REPAIR MANUEL AND PARTS MANUEL FOR THIS 2003 PT CRUISER? LOOKING FOR A DETAIL DIAGRAM OF HOW THIS THING IS PUT TOGETHER.

THANKS FOR ANY HELP IN ADVANCE FROM YOUR MOST NEEDY NEW MEMBER..

MERRY CHRISTMAS,

MIMS
You didn't say whether your temp gauge is reading normal or not. You could have a bad thermostat or clogged radiator. Lots of stuff you need to rule out before you jerk your dash apart. So why don't you give us some more detailed info about your pt. Mileage and how it started this and anything that's been done recently. So we can help you find what your problem is.Oh No caps. That is shouting on the internet.
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Last edited by Busted_PT; 01 Dec 2013 at 09:31 am.
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Old 01 Dec 2013, 12:36 am
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Post Re: 2003 HEATER PROBLEM...AIR BLOWING BUT NOT HOT

Hope some of this may help.....





Here follows a cut and paste from a 2003 shop manual.
DESCRIPTION - SYSTEM AIRFLOW
The system pulls outside (ambient) air through the cowl opening at the base of the windshield. Then it goes into the plenum chamber above the heater-A/C housing. On air conditioned vehicles, the air passes through the evaporator. Air flow can be directed either through or around the heater core. This is done by adjusting the blend-air door with the TEMP control on the instrument panel. The air flow can then be directed from the panel, floor and defrost outlets in various combinations using the mode selector.
There are 17 different mode selections possible. Air flow velocity can be adjusted with the blower speed selector switch on the instrument panel.
On A/C equipped vehicles the ambient air intake can be controlled by opening and closing the recirculating air door. When placed in RECIRC, air that is inside vehicle is removed continuously and recirculated through unit housing. Ambient air cannot be controlled on vehicles without A/C. The system uses outside air at all times. The air conditioning compressor can be engaged by turning the fan switch counterclockwise from the off position. It can also be engaged by placing the mode control in the mix to defrost positions. This will remove heat and humidity from the air before it is directed through or around the heater core.
DESCRIPTION - HEATER AND AIR CONDITIONING
All vehicles are equipped with a common heater- A/C housing assembly. The system combines air conditioning, heating, and ventilating capabilities in a single unit housing mounted under the instrument panel. On heater-only systems, the evaporator coil is omitted from the housing and replaced with an air restrictor plate. Outside air enters the vehicle through the cowl top opening at the base of the windshield, and passes through a plenum chamber to the heater-A/C system blower housing. Air flow velocity can then be adjusted with the blower motor speed selector switch on the heater-A/C control panel. The air intake openings must be kept free of snow, ice, leaves, and other obstructions for the heater-A/C system to receive a
sufficient volume of outside air. It is also important to keep the air intake openings clear of debris because leaf particles and other debris
that are small enough to pass through the cowl plenum screen can accumulate within the heater-A/C housing. The closed, warm, damp and dark environment created within the heater-A/C housing is ideal for the growth of certain molds, mildews and other fungi. Any accumulation of decaying plant matter provides an additional food source for fungal spores, which enter the housing with the fresh air. Excess debris, as well as objectionable odors created by decaying plant matter and growing fungi can be discharged into the passenger compartment during heater-A/C system operation.
The heater and optional air conditioner are blend-air type systems. In a blend-air system, a blend-air door controls the amount of unconditioned air (or cooled air from the evaporator on models with air conditioning) that is allowed to flow through, or around, the heater core. A temperature control knob on the heater-A/C control panel determines the discharge air temperature by moving a cable, which operates the blend-air door. This allows an almost immediate manual control of the output air temperature of the system.
The mode control knob on the heater-only or heater- A/C control panel is used to direct the conditioned air to the selected system outlets. The mode control switch uses a cable to control the mode door, while
the recirculation air door is operated by a vacuum actuator motor.
On air conditioned vehicles, the outside air intake can be shut off by selecting the recirculation mode (Recirc) with the mode control knob. This will operate a vacuum actuated recirculating air door that closes off the outside fresh air intake and recirculates the air that is already inside the vehicle.
The optional air conditioner for all models is designed for the use of non-CFC, R-134a refrigerant. The air conditioning system has an evaporator to cool
and dehumidify the incoming air prior to blending it with the heated air. This air conditioning system uses an evaporator probe to maintain minimum evaporator temperature and prevent evaporator freezing, and cycles the compressor clutch.-

RECIRCULATION DOOR ACTUATOR DESCRIPTION
The vehicle uses vacuum to operate only the recirculation door. All other controls are cable. When vacuum is supplied to the actuator, the door moves to the Recirculation position. The actuator is spring loaded so the door moves to the Outside-air position when there is no vacuum supplied. The operation of the door can be viewed by removing the blower motor and looking up into the unit inlet.
Normally, vacuum is supplied to the actuator by placing the Circulation control knob in the Recirculation position. The Mode and the circulation control are mechanically interlocked so the circulation control cannot be placed in the RECIRC position if the mode control is at or between the mix and defrost positions. Vacuum is supplied to the actuator only when circulation control is at the RECIRC position. If the circulation control is between the outside air position and RECIRC position the system will be in outside air. If the circulation control is in the RECIRC position and the mode control is moved from the floor to the defrost positions, the circulation control
will move from the RECIRC position, to the outside air position beginning at the mix position. This is to prevent window fogging.
REMOVAL
The recirculation door actuator is a vacuum controlled actuator used to control movement of the recirculation door in air conditioner equipped vehicles.
The instrument panel must be removed from the
vehicle to gain access to the recirculation door actuator.
(1) Remove the battery negative cable
(2) Remove instrument panel from vehicle
(3) Disconnect vacuum line harness connector from
the nipple on the recirculation door actuator.
(4) Release the latch that secures the recirculation door actuator mount to the stanchion on the heater- A/C unit housing, and disengage the recirculation door actuator from the housing.
(5) Disconnect the recirculation door actuator linkage
from the recirculation door lever.
(6) Remove the recirculation door actuator from the heater-A/C unit housing.
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Old 01 Dec 2013, 07:55 am
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Default Re: 2003 HEATER PROBLEM...AIR BLOWING BUT NOT HOT

....also pull your HVAC control panel and make sure the knobs themselves are moving the cables and check the vacuum lines to see that they are attached and not split.

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Old 01 Dec 2013, 11:39 am
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Default Re: 2003 HEATER PROBLEM...AIR BLOWING BUT NOT HOT

More Clues:
The PT Cruiser has 134,000 miles, no work has been done except oil and lube plus new tires. temperature runs normal. All was working fine last winter and the AC worked fine through the summer. Only noticed there was no hot air once we needed it this winter.
Also, after the car is warmed up... If I shut the vehicle off and let it sit for a few min.. say make a run into starbucks,, then start the vehicle you can feel hot air for about a min before it turns cold. I liken this to when you turn your home A/C on during the summer months.. the cold air pushes out the hot trapped air within the attic ducks. I believe the heater core is warming up the AC / Heater chamber and then hot air pushed out, for a moment, when car is started.

My thought:
If I have studied the manual correctly,, it is not vacuum that controls the Blend-air door but a cable. If that is correct, then I am thinking it is the Temp Control cable that is not moving the blend-air door to divert air across the heater core.

Thanks for any help and please forgive about the CAPS. We type in CAPS all day at work.

Thanks again,

mims
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Old 01 Dec 2013, 01:21 pm
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Lightbulb Re: 2003 HEATER PROBLEM...AIR BLOWING BUT NOT HOT

Quote:
Originally Posted by howardmims View Post
My thought:
If I have studied the manual correctly,, it is not vacuum that controls the Blend-air door but a cable. If that is correct, then I am thinking it is the Temp Control cable that is not moving the blend-air door to divert air across the heater core.
There is also a cable 'hold-down' with a screw that holds the cable in place,if it comes loose,or isn't tight enough,it can allow the cable to move when pushing one way,or another.
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Old 06 Dec 2013, 12:50 am
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Default Re: 2003 HEATER PROBLEM...AIR BLOWING BUT NOT HOT

First start your PT. Let it idle up to normal operating temperature. Next, open your hood and reach back between the throttle body and the firewall and feel first one and then the other heater hose where they enter and exit the firewall. If both hoses are equally warm (hot) then your heater core is fine. Your problem will be with the blend doors that control a/c & heat output in the dash.

Some suggestions were made above this post to make repairs in that case.

Jerry
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