MY HEATER AND MIX WHEN TURNED ON NO AIR COMES OUT YET MY DEFROSTERS WORK. MY SERVICE LIGHT CAME ADE CODE 171AND 174 CAME UP. I WAS TOLD I NEED A NEW PLASTIC MANIFOLD ON MY 98 MERC. GRAND MARQUIS. MT COST IS 450 FOR NEW PARTS 400 LABOR. HOPE YOU CAN HELP ME OUT IS THIS A GOOD PRICE. THANK YOU. I ALSO WAS LOSING ANTIFREEZE FROM A LEAK IN THE ENGINE
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Re: IM TOLD I NEED A NEW MANIFOLDAT ABOUT 450.OO
That is too much money for that manifold. Call your local parts stores, and get a price. Some parts stores carry the plastic manifolds. The last one I put in was about $200 for the part. It takes about 4 hours labor, so about $280.00 in labor.
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Great question dustin but the A/C is suppose to come on in defrost or mix mode- this is floor & defrost. Does not seem to make sense does it. One of the things the a/c does is remove the moisture from the air. You need warm DRY air to remove the moisture from the windows. An automotive H.V.A.C. ( Heating,Ventilation,Air conditioning) first forces air thru the a/c evaporator core then thru the heater core and out the selected vent. If you only want a/c a blend door will by-pass the heater core which is controlled by a hot/cold knob or digital temp cotrol on the dash. Now back to the cold air problem- assuming the basics are all ok- Coolant is full, Engine gets up to proper operating temp-around 195 degrees- upper radiator should be hot. Both heater hoses should be hot. If thats all OK the blend door might not be working. It is controlled by an electric motor called a Blend Door Actuator which are prone to fail. I have replaced many on ford vehicles. Hope this helps
Hi, in most cars it's much easier than in yours. I have pasted the procedure below from Autozone.com. Please let me know if you have questions. Also, I would be happy to confirm for you that you need a new panel if you can tell me the symptoms you are having.
Removal & Installation
Disconnect battery negative cable from remote negative terminal on shock tower and properly isolate to prevent accidental reconnection.
Remove or disconnect the following:
When the control panel assembly is out, it will have to be disconnected from the wire harness and control cables. Center panel assemblyFront driver's side under coverFront passenger's side under coverRadio/tape/CD playerFloor consoleInstrument panel center reinforcementFoot duct (LH)Control panel assembly Light bulb harnessDefroster switchAir mix damper control cableAir outlet changeover control cable
Attach control cables to control panel
Set the air outlet changeover control knob on the heater control assembly to the defroster position.
Set the air outlet changeover damper link of the heater/cooler unit to the defroster position as shown in the illustration, and then connect the cable to the link pin.
Push the outer cable in the direction so that there is no looseness, and then secure it with the clip.
Install or connect the following:
Defroster switchLight bulb harnessControl panel assemblyFoot duct (LH)Instrument panel center reinforcementFloor consoleRadio/tape/CD playerFront passenger's side under coverFront driver's side under coverCenter panel assembly
Yeah that sounds right, sounds to me Like Power Control Module (AC Control Module). You shouldn't need to get a code from the factory removing the Radio. If you do its not a big hassle it can be done by phone.
Since warm air eventually comes out when the vehicle is in motion, you may have an air mix door that is stuck in fresh or is somehow blocking warm air from the heater core.
To see if the air mix control motor is bad, you need to retrieve your Diagnostic trouble codes (DTC's) from the heater control panel. To run the diagnostic function, do the following: 1. Turn the ignition switch ON (II). 2. Turn the fan switch OFF. 3. Press the recirc control button to select Recirc (recirc light on.) 4. Press and hold the recirc button to select Fresh (recirc light off) and continue to hold the button down until the recirc light comes on for two seconds and then goes off. 5. If the system is okay, the recirc light stays off. 6. If there is a problem, the recirc light blinks the DTC to indicate the trouble. One blink=a problem in the air mix control motor circuit. Two blinks=problem in the mode control motor circuit Three blinks=problem in evaporator temp sensor circuit. 7. Turn the ignition switch off to cancel the self diagnosis function. Run the diagnostic again after repairs are complete.
Note: the air mix control motor has a rod which connects to a plastic link. The link controls the mix doors and also connects to the heater control water valve via a cable. The air mix motor may check okay, but if the link is broken then you will still have problems. the motor is on the bottom of the heater unit in the front passenger's foot well.
Take cap off rad when cool enough to do so. Start the car with cap off & heater turned on,(not defrost) and let it run for a while, as in wait for rad fan to come on 2 or 3 times. Add coolant/mix as needed while doing so. My guess is that you have an air lock in cooling/heating system that hasn't been bled out yet. Once in a while just rev engine a little, for about 30-second to 1 minute to increase flow through system, to help bleed & circulation. You should start to feel heat coming. Only put rad cap back on after rad fan has come on after 2nd or 3rd time. Check return bottle & fill it to mark as specified. If that doesn't do it, take it back to guy who flushed it, he should know what he did wrong.