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I changed the thermostat in my 1999 Mercury Sable. I still have no heat and there is no air bubbles in the system. What else could be wrong with it??

I tried revving it up and it worked for like five minutes..

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  • 4 Answers

You can try disconecting the return hose from the heater to see if you have water flow through the heater.

Posted on Nov 01, 2012

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: 1999 mercury cougar only blows cold air, no heat.

if the car is overheating the thermostat is stuck closed if the car is not overheating the heater control valve may need to be replaced

Posted on Dec 17, 2008

  • 1 Answer

SOURCE: 2000 MERCURY SABLE

My 2000 Sable starts blowing hot air about every 6 months. I mean like an oven. All I do is disconnect the battery negative terminal for about 5 minutes. After I re-connect the problem is solved. This solves many problems on this car, it just needs a re-boot. It must be powered by Microsoft (ha ha). Good luck. ps my auto headlamps never did work right either. Dave.

Posted on Apr 21, 2009

  • 72 Answers

SOURCE: can you bleed the water cooling system on 1999 mercury cougar

This is extremely important on some cars, for instance my BMW. 1. Have the car parked in a slight uphill slope. Make sure there is enough coolant in the expansion jar.
2. Start the engine and wait for the thermostat to open (upper radiator hose becomes warm).
3. Open up the radiator bleeding nipples slightly with a large screwdriver (bleeding nipples normally made of plastic with a '+* for a screwdriver to fit, at the highest points in the cooling circuit).
4. Allow air bubbles to fizzle out until you get a steady stream of coolant leaking out, use rags to capture leaking coolant.
5. Then close the bleeding nipples, switch off the engine and wait a few minutes for pressure to come down.
6. Open up the cap on the expansion vessel carefully and fill just below the "hot" marking.
7. Check levels again after a few miles and refill further if needed.

Done.

Posted on May 31, 2009

oldfishead
  • 155 Answers

SOURCE: power steering leak on passengers side of 1999 mercury sable.

If it "RED" in color, like p/s fluid, and coming from the BOOT, then its your p/s rack assembly.The unit has to be replaced and alignment reset. ..also check the HOSES they are prone to leak also...hope this helped..GL

Posted on Jul 06, 2009

c17hydro
  • 2984 Answers

SOURCE: how do you replace a thermostat on a 1999 mercury

Here ya go!

3.0L DOHC VIN S Engine
CAUTION NEVER open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities.Always drain coolant into a sealable container. If necessary, clean coolant maybe reused unless it is contaminated or more than two years old.


  1. Drain the coolant until the level of the coolant is below the level of the thermostat.
  2. Raise the vehicle and support it with jack stands.
  3. Disconnect the lower radiator hose from the water inlet connection.
  4. Unfasten the two water inlet connection retaining bolts and remove the water inlet connection.
  5. Remove the O-ring seal and thermostat from the water inlet connection. Inspect the O-ring for damage and replace as necessary.
To install:
  1. Clean the water inlet connection mating surfaces.
  2. Install the O-ring, thermostat and the water inlet connection. Refer to Figure 10 if you can't remember how the O-ring and thermostat are positioned.
  3. Install the water inlet connection assembly retainers and tighten them to 71-106 inch lbs. (8-12 Nm).
  4. Connect the lower radiator hose to the water inlet connection.
  5. Fill the engine with coolant, start the engine and check for leaks.
  6. Stop the engine and top off the coolant recovery reservoir as necessary.

672e86b.gif
Exploded view of the water inlet connection and the thermostat assembly-3.0L DOHC engines

Posted on Jun 02, 2010

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