1999 Mercury Sable

Hello - Byll

Well just a few questions so we can get on the same page. First, do you have a 3.0L DOHC VIN S or 3.0L VIN U? I need to know the 8th digit of your VIN.

Next if I understand you correctly neither your AC or heater are working. Heat first.

You select heat and turn the blower on high and the fan does not work at all?

You select heat and the blower works but no heat comes out?

You select heat and nothing at all happens?

Next with the AC... You guess it, same questions.

When you serviced the AC you used the Low/High service gauges? What were the readings L and H hooked up before engine start?

What were the gauge readings L and high when the compressor kicks off?

What were the gauge readings L and H when the compressor kicks back on?

Next, please go to Auto Zone or O'Reilly's and for FREE they can pull the codes to the car. Most important: Once they check your codes, if they find something and you don't get it fixed and need to get back with us, please make sure you tell us exactly what the code was, number and all. Example, if the code was E0568 O2 Sensor bad. Then make sure you give us all of that. While there for FREE also they can bring their tester out and check your battery, alternator and starter.

Please provide the above info and get back with me and we will see what we can do.

Hello -

Lets go with the heat first.

Are you sure you have antifreeze in the system?

If so, are the heater hoses going into and out of the firewall hot at all when the car is at operating temperature?

147000 miles, have you ever changed your thermostat?

Your car temp gauge, is it cooler than normal? On your model there is a solid band between the C and the H I believe and it should be sitting there for normal operation. How is it sitting?

As for the AC - you really need a set of gauges, both to see what the high and low side are doing. Too much 134 can damage the compressor. Not enough will cause it to not cool and not operate. Not knowing what the H&L are I could cause you more damage. Under normal conditions, the cycling is normal depending on the pressure switch. When it is not full all the way it will also do this as it has a safety to disengage the clutch when it is low.

We can look at something though...I believe you have 2 cooling fans at the radiator. Turn you AC totally off. Start the car and see if one or both of the radiator cooling fans are turning. Then turn the AC on... Are one or both turning now?

Next, please go to Auto Zone or O'Reilly's and for FREE they can pull the codes to the car. Most important: Once they check your codes, if they find something and you don't get it fixed and need to get back with us, please make sure you tell us exactly what the code was, number and all. Example, if the code was E0568 O2 Sensor bad. Then make sure you give us all of that. While there for FREE also they can bring their tester out and check your battery, alternator and starter.

Hello

Sounds like a good deal 500. As for the antifreeze, definitely get that in there, that helps regulate the heat.

You said it overheated can you explain more. The temp gauge red lined at the H, water boiled over? Can you be more specific? What do you think was the cause, water pump leaking..?

When you say the temp is  way on the cool side, I don't have a pic of the gauge so I am taking that to mean it reads below the normal operating temperature? If it is doing that then your thermostat may be stuck open.

When you say both heater hoses are hot going into the fire wall, they are hot to where you can not grab them and hold them or you can still just keep your hand on them?

The air from the heater, is it just luke warm or cold?

The best way to do this though you may have to pay a little for them to check, is to have a place check the AC to see why it is not working and tell them to let you know before they fix anything. Just by what you say, your compressor may be bad. But without knowing the H an L side readings I am shooting in the dark. Shop around for that... Some places may only charge about 25 to check it to tell you what's wrong. The you can take it from there.