Question about 1996 Mercury Sable

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Car reaching operating temp

I have a 1996 Mercury Sable that is is not reaching operating Temp. It stays close to the Cold mark and does not move from that spot. The gauge does start out at the cold mark when I first start it up in the morning. There is heat coming from the vents inside the car. I did have to add some coolant to the overflow tank. The oil is clean and there is no coolant in the oil. I let it idle for about 20 minutes and the temp gauge didnt move, nor did the cooling fans kick on. I decided to turn the A/C on to make sure the fans were working. They both did come on when I tuned on the A/C. I place my hand by each fan to see it the air was warm. On the Drivers side the air was warm, on the passengers side the air was cold. I hope it is the thermostat issue, but something tells me it is more costly like a head gasket issue. Btw just bought this car so I didn't know about this issue. The car has 121,000 and there are no lights on the dash board. The car runs and drives fine. Any ideas?

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  • Mercury Master
  • 2,122 Answers

Hi Justin, A problem with the cylinder head almost always results in overheating, not running below operation temperature. I think you hit the nail on the head with your diagnosis of a defective (or missing) thermostat. Regards John

Posted on Nov 19, 2013

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Posted on Jan 02, 2017

  • 104 Answers

SOURCE: I have a 2002 Mercury Sable 3.0. I noticed when

The clicking noise is the motor for the "blend door". The heater core and the air conditioning side share the same ducting. When you move the knob a small motor moves the door letting the respective hot or cool flow happen.
The heater core is probably blocked. The engineers at Ford have the coolant hoses bypassing the core with a WYE at the firewall. The coolant takes the path of least resistance and stops FLUSHING the heater core and it eventually clogs.

Posted on Oct 20, 2010

  • 60 Answers

SOURCE: I have a 2000 Mercury

Hi,

The overheating and lack of cabin heat both point to a failed engine thermostat which would be stuck closed. At the warm up stage, the coolant stays in the engine block to bring the engine to efficient operating temperature, then it opens and circulates the coolant through the radiator and heat core. If the thermostat is stuck closed, the engine will overheat, and coolant will never reach the heater core, and you will not get cabin heat.

Blinking oil light at idle which goes away during driving could be a low oil level, but may also be a drop in oil pressue. You could have a clogged oil fliter (at best) pickup tube, or a failing oil pump.

Posted on Mar 10, 2011

cansmo
  • 2431 Answers

SOURCE: Hi: I read your answer to

Very correct the ECT is a 2 wire thermistor,when coolant temp increases, the resistance andsignal voltage decrease,If you disconnect the sensor the fan goes on, you just trouble shooted the vehicle cooling fan switch, If anything the signal to the gauge itself may be non-op and not getting to the indicator, try this with vehicle at warm up temperature if you turn the A/C does the fan turn on.it should if it doesnt the power juction box (fuse and relay in engine compartment should be checked, for any opeen fuses, By the way the guage information is from the PCM

Posted on May 04, 2011

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