Question about 2004 Mercury Mountaineer

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I have a 2004 Mercury Mountaineerthat blows out cold air so I changed the thermostat and it is still blowing out cold air and there is a knocking sound right below the thermostat gauges,could it be in the vacuum.what are my options?

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  • Mercury Master
  • 1,449 Answers

Sounds like you have air in your heater core,or dirty radiator you need to flush it out with a cleaner ,put the cleaner in your expansion bottle .run the engine till it is hot then drain it ,refill with a 50/50 mix of antifreeze put your heater on full with your windows open .that should remove the air in your system .

Posted on Nov 23, 2014

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  • Mercury Master
  • 286 Answers

It sounds like the motor that opens the heat blend door is malfunctioning... They sell them for most makes and models at your local part store... Also a Haynes or Chilton manual to give you specific direction for your vehicle. Also try removing both heater hoses from your heater core at the firewall and now compressed air through the heater core... It may be restricted

Posted on Nov 22, 2014

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Posted on Jan 02, 2017

vetteman3002
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SOURCE: 2004 Mercury mountaineer will not

This could be a couple of different problems. The first and most common problem is that the control motor that moves the door inside the duct work for the heater has failed. The door on the heater core is no longer opening supplying to supply heat. The other problem that it could be is that your climate control module that has the digital thermostat is not sending the signal to the motor in the duct work to open the heater core door. And finally the last thing that it can be, which is not real likely on a 2002 is that the heater core is plugged and not letting hot water from the engine though it.

Posted on Oct 28, 2010

  • 115 Answers

SOURCE: 1993 mercury capri heater will only blow cold air

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The linkage under the dash sometimes breaks, the picture shows the most common part that breaks. You can see this from the drivers side, its a back breaker to get in there to see it, trust me!!! You'll have to find a junkyard Capri to get this part if its broke, OR... Look at the picture near the 'A'. That plastic arm is supposed to move like that double-ended arrow line shows. That is what does not move to give you heat when the part breaks. In a pinch, you can tie a string to the part, and run the sring where you can get to it from inside teh car. Just a tug, and you've got heat, until you can find the broken part. Good luck...Chris

Posted on Nov 13, 2012

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