Question about 1997 Lincoln Town Car

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When I start vehicle, the temperature gauge stays on lowest setting even when vehicle gets warm after 15-20 minutes of running. Then the vehicle will die and I have trouble starting it. Finally it will start and the vehicle's temperature gauge will shoot back to normal operating temperature and the vehicle runs fine. This typically happens when I first start if for the day. suggestions?

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Either a bad sending temp sending unit (engine) or the cable fell off it

Posted on Jan 02, 2011

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Could be a weak connection in the wiring harness going to the cluster, or inside the key switch.

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How do i bleed the air to make it start circulating after changing the thermostat


Set the cabin heater control to hot setting. If fitted with climate control, then put the fan on it's lowest setting.
Remove the radiator cap and massage the radiator hoses by squeezing them with your hand (assuming they are cold/warm only)
Locate any bleed screws on any hoses, including the hoses which supply the cabin heater matrix. Slacken these bleed screws if available. Also check the thermostat housing for any metal bleed screw and slacken that too.
Run the vehicle, and keep a check on the radiator fluid level. Top up if necessary. As soon as coolant begins to leak from any bleed screws, shut them off. Run the vehicle up to temperature, until the radiator fan kicks in. Keep an eye on the temperature gauge and shut the vehicle off if the temperature climbs too high at any point.
Once the radiator fan kicks in, then close the radiator cap.


Run the vehicle for ten to twenty minutes once up to temperature.


Turn the vehicle off and allow to cool.


Check the radiator level and top off if required.


Check the expansion tank level and top up to mark.


Done!


After a day or so running, check the radiator level and expansion tank level again. During the first few days of running, pay particular attention to the engine temperature and coolant level.


In some cases the new addition to antifreeze can reduce the water's coefficient of friction/surface tension enough that small leaks can appear in the system. So after running for a few hours, check the entire system for leaks, and perform a pressure test if possible.


Antifreeze to water should usually be mixed at a ratio of 1 to 1 or 50/50


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2000 malibu runs hot if not warmed up


How do you know it gets hot? Are you going by the temperature gauge on the dash? Or have you checked under the hood and found out the engine really is running hot? ...Reason I ask is, something just doesn't sound right in your description. After just 5 minutes from starting and driving away, the engine would not yet be at normal operating temperature. That would explain the heater not yet warm. But the temp. gauge says hot?
If so, I would replace the temperature sending unit on the engine. the one for the dash gauge, and see if that was the problem-not reading the temp. accurately.
Couple of other things: Are you sure you got all the air out of the coolant system? Start the car with the radiator cap off and let it run until the engine is warmed up fully, then shut it off and install the cap. Does your reservoir tank stay about half full where it should be, between the full-hot and full-cold marks?
If your problem persists. I would have the coolant system pressure tested, and see if you could get a true temperature reading of the coolant when it seems to be running hot.
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It doesn't get warm or hot at all. and when or if it does get warm it takes FOREVER.


I assume you are talking about your engine temperature gauge reading? I had a problem with my 1996 Caravan thermostat (V6 3L). It can get stuck wide open and never allow the engine to operate at the specified temperature. On my vehicle, the thermostat has a metal tab that would prop the valve wide open if it failed. I think the thought of the designer was better to be stuck open than full closed I guess. Anyway, my vehicle temperature would never reach normal range with it stuck open. For my vehicle it is 195 F. This time of year, it would take a very long time before your engine would reach normal running temperature. The interior heater would also take a long time since the engine is also cooler. If your vehicle is newer it can also cause the engine check light to come on because this would affect the emission control systems and keep your engine in a cold engine mode loop...

Not knowing a lot of details of your situation, I would check:

The gauge is working correctly and plugged into the temp sender near the thermostat.

You have the correct fluid level (Please be careful checking this)

Your heater core and engine radiator not clogged with sediment

Flush out your radiator and heater core

Replace your engine thermostat with the specified temperature range your vehicle requires (parts store tech can help you obtain the correct one)

Good Luck.

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Sometimes a motor is more sensitive to warm conditions. When the water temperature sensor does not cool off it keeps the engine in a warm run mode which is very lean. This is how lower emissions and better fuel economy are made.

The "cold start sequence" makes a richer fuel mix for starting and running. I have not seen a dividing point where this switches from one mode to the other. IF it is say 180 water temperature degrees and your car stays above 180 degrees turned off after running, then the fuel mix will be very lean until the engine coolant loses heat.

About all you can do is put in a new thermostat of proper temperature or a lower temperature thermostat. You could flush the radiator and back flush the block so that heat loss is more efficient. You could put in a new water temperature sensor. You want to get rid of calcium-fication of the internal surface areas so the components are more like factory new.

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0900c1528008f125.jpgFig. 1: View of the Engine Coolant Temperature (ECT) sensor 0900c1528008f126.jpgFig. 2: Engine Coolant Temperature (ECT) sensor locationTESTING
See Figures 3 and 4
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