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Fix the temperature indicator for cooling system

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08 mkz: overheating when outside temps go over 100. A/C blows hot when overheating. Replaced fan & control module. Coolant system flush. Problem persists. No issues when outside is<100. 3 yrs no fix.


Have you had the vehicle checked for DTC'S - diagnostic trouble codes ? There is Fail Safe Cooling
The vehicle has a strategy built into the powertrain control module (PCM) that will control the engine if it starts to overheat.
Stage 1 of the strategy will commence if the engine starts to overheat. The cylinder head temperature (CHT) sensor transmits a signal to the PCM, which then moves the temperature gauge pointer into the red zone.
If the engine is not switched OFF and the temperature continues to rise, the powertrain check lamp is illuminated. This indicates to the driver that the engine is approaching critical limits and should be stopped. At this point, DTC P1285 is set in the PCM and can be retrieved using a scan tool.
Stage 2 of the strategy will commence if the lamp and temperature gauge are ignored by the driver. The PCM will start to control the engine by cutting out cylinders and restricting the rpm to below 3,000 rpm. Simultaneously, the malfunction indicator lamp (MIL) will be illuminated. This indicates that long-term engine damage can occur and vehicle emissions will be affected. At this point, DTC 1299 is set in the PCM and can be retrieved using a scan tool.
Air is then drawn into the deactivated cylinders. This helps to control the temperature of the engine internal components. The deactivated cylinders are alternated to allow even cooling of all the cylinders.
NOTE: If the driver is using a high percentage of throttle travel (for example, an overtaking maneuver) when the PCM starts, engine deactivation will be delayed for 10 seconds.
NOTE: After the cylinder deactivation operation has begun, the engine will not revert to operating on all cylinders, even if the temperature should fall, until the ignition is switched OFF and then ON again.
NOTE: The malfunction indicator lamp can only be extinguished by using a scan tool after the fault has been rectified and the DTC cleared.
Stage 3 of the strategy will commence if the engine temperature still continues to rise. This will result in the engine being totally disabled before major engine damage or seizure occurs. The powertrain check lamp will begin to flash, indicating to the driver that the engine will be switched OFF after 30 seconds. This allows the driver time to choose a suitable parking place.
who replaced the cooling fan motor an control module ? Maybe it's time you take your vehicle to a qualified professional , unless you like replacing parts that don't need replacing !

Aug 17, 2016 | Cars & Trucks

1 Answer

Why doesn't my 2001 Ford Taurus have heat but the blower motor works but only blows cold air.


Is the coolant level full ? Are the heater hoses hot to the touch ? Do you know where the heater hoses are ? Out in the engine compartment going through the fire wall into the passenger compartment . 2 hoses , one carries hot coolant into the heater core the other is a return back to the cooling system . If hoses are hot you have a temp. door not working . When warmed up what does temp gauge show ?
Temperature Control
The temperature control operates in the following manner:
  • Temperature control of the manual A/C-heater system is determined by the position of the temperature control knob (between COOL and WARM).
  • This control knob is connected to a potentiometer mounted in the integrated control panel. This potentiometer is electrically connected to the A/C electronic blend door actuator that operates the A/C air temperature control door.
  • The A/C electronic blend door actuator contains a reversible electric motor, another potentiometer and a printed circuit board. The wiper of the potentiometer is connected to the actuator output shaft and moves with the output shaft to indicate the position of the A/C air temperature control door.
  • Battery voltage is applied to the ends of each potentiometer. The voltage available at each wiper indicates the position of the potentiometer. The printed circuit board drives the actuator in whichever direction is necessary to make the actuator wiper voltage agree with the control wiper voltage.
System uses a reheat method to provide conditioned air to passenger compartment.
  • All airflow from the blower motor (18527) passes through the A/C evaporator housing where it can be cooled and dehumidified.
  • Temperature is then regulated by reheating a portion of the cooled dry air and blending it with the remaining cool air to the desired temperature.
  • Temperature blending is varied by the A/C air temperature control door which regulates the amount of cooled air that flows through and around the heater core (18476), where it is mixed and distributed.

Feb 24, 2016 | Ford Cars & Trucks

2 Answers

01 Cadillac overheating and having no power like it has a governor on it


The engine is swelling because of the over heating. Stop using it !!!!!!!!! Gotta fix cooling system lest you seize the engine.

Nov 11, 2015 | Cadillac Cars & Trucks

2 Answers

I have 2006 Chevy impala 3.5l and it's slightly overheating and I just recently changed the water pump and thermostat but it didn't change, and when I turn my heater on the air flow is very low.


check the lower (suction) radiator hose that it cannot collapse, they usually have a metal coil inside to prevent this. If you left this out when installing the water pump it could be the cause..What temperature is the gauge reading? You could have been running too cool before and now that the new thermostat is in its up to normal temperature.

Low airflow through the heater is a separate issue and can be caused by leaves in the ductwork, a blend door not opening/closing fully, clogged heater core (are you a smoker?) Good luck.

Edit: I had another thought on this.. the cooling system needs bled carefully, air in the system can cause symptoms like you describe, look for a bleeder screw on top of the engine somewhere and make sure to let the air out of the system.

Jun 27, 2015 | Cars & Trucks

1 Answer

Temperature gauge in nissan frontier goes from medium to low randomly, also off and on roaring sound coming from what seems to be the fan while running.


This is an indication of air or gas bubbles in the cooling system, it can be that the system is low on coolant due to a leak (have a cooling system pressure test performed) or that you have a leaking engine cylinder head gasket. I would also replace the thermostat just to rule it out as a cause, it could be sticking and causing the rapid swings in engine temperature.

Jan 19, 2012 | 2001 Nissan Frontier Crew Cab

1 Answer

I have a 2004 Jeep Cherokee Laredo. An indicator (with a symbol of what looks like a radiator) below the low fuel indicator (bottom left had side of the dashboard) lights up and remains on. I have checked...


2005 Instrument cluster layout
2005_cluster_01s.jpg
1. Speedometer
2. Brake warning light
3. Turn signal indicator light
4. High beam indicator light
5. Malfunction Indicator Light (MIL)
6. Airbag warning light
7. Anti-Lock brake warning light
8. Tachometer
9. Security alarm indicator light
10. Oil pressure warning light
11. Electronic Stability Program (ESP)/
Traction Control System (TCS) indicator light
12. Tire Pressure Monitor warning light (base)

13. Temperature gauge
14. Electronic Vehicle Information Display
15. Tow/Haul indicator light
16. 4WD Low mode indicator light
17. Seat belt reminder light
18. Cruise control indicator light
19. Odometer/Trip Odometer
20. Transmission gear indicator
21. Fuel gauge
22. Electronic Throttle warning light (5.7 Hemi)
23. Front fog light indicator light
24. Voltage warning light

Jun 05, 2011 | 2004 Jeep Grand Cherokee

1 Answer

I bought my son a 1999 oldsmobile intigue GL with the 3800.. The car's stereo was stolen, and the temperature and tachometer gauge is not working. I am not sure if it was related to the stereo being...


I would see if the gauges are connected at the harness behind the instrument panel. But, that can be time consuming to take apart that part.

There is probably a separate temperature light that indicates when the engine is too hot. If not, then just make sure that the coolant level is high enough, that the thermostat is not stuck closed, and the fans turn on when the engine gets to normal operating temperature or when it is hot.

GM vehicles from the 1990s can go a long time before overheating occurs due to leaks or break downs in the cooling system.

If there is a slow leak in the cooling system, though, I would fix the problem before a lack of feedback causes an overheat condition in the engine of the vehicle.

Nov 06, 2010 | 1999 Oldsmobile Intrigue

2 Answers

Which side ofintake manifold does temperature gauge sending unit go on


Water Temperature Indicator Sender Unit
The water temperature indicator sender unit is installed on the engine into an engine coolant passage. The water temperature indicator sender unit reacts to the engine coolant temperature. Its resistance decreases as the engine coolant temperature increases.

Water Temperature Indicator Sender Unit Removal
swb~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Do not mix Standard (green) Coolant with Extended Life Coolant (orange). If mixing occurs, drain engine cooling system and refill with originally equipped coolant type. If this contamination occurs the service change interval on Extended Life Coolant will be reduced from 6 years/150,000 miles to 3 years/30,000 miles.
  1. Partially drain engine cooling system as described.
  1. Disconnect engine control sensor wiring (12A581) from water temperature indicator sender unit (10884) .
  1. Remove water temperature indicator sender unit.

Jul 30, 2010 | 1998 Ford Mustang

1 Answer

Hi, nissan stanza 91 engine overheats and smell burnt and white steam coming out from it, but the indicator on dashboard remains normal, in the middle. what shoul I try, to fix it?


You could possibly have air in your cooling system. If the dash gauge temperature sensor does not have coolant flowing past it, it will give a false temperature reading while your engine is actually overheating. If you recently drained and refilled your cooling system, you might need to bleed the air out of that system. If you didn't drain it recently, you might have a leak that's letting out coolant and letting in air.

Mar 26, 2010 | 1991 Nissan Stanza

1 Answer

What are the maximum level the temperature indicator reach ?because temperature indicator in dashboard reach a midway between max.&minimum level &may slightly exceed that level in very hot...


I will assume that you are speaking of the thermostat when you say "valve".

In that case removing the thermostat can cause boil over in long run conditions in elevated temperatures as it has no way to stop or divert the coolant flow to cool the coolant an reintroduce it back to the cooling system. Also unless you plan to run the car longer than 45 minutes before you drive; your windshield defogger/defroster will not work enough to clear the window on rainy days.

50% to 60% as you describe; on the temp indicator I would consider normal operation.

~ Hope this was of help and answered your questions

May 30, 2009 | 1996 Mercury Grand Marquis

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