2011 Crown Victoria Police Interceptor overheating problem: I observed that the temperature gauge indicator reached the highest point and the warning light lights up while driving with the AC switch is on, the AC also blew hot air. I then switched off the AC and turned the climate control knob to hot to get home. Since, I drove the car with AC switch off and climate control all the way to hot. And the temperature gauge stays on normal temperature in the middle if you will, but if I turn the climate control to cold, the engine begins to overheat. I drive the car on short trips during the day about 4-5 mile once in the morning and once in the afternoon while climate control knob turned to hot position, and AC switch off position. Strangely, when the climate control knob is moved to the middle and the AC switched off, hot air still blows out through the vents. The engine cooling fan at the front spins when directly connected to the battery, but doesn't switch on otherwise. • Is it because the AC need to be recharged with R-134a refrigerant? • Any other suggestion please let me know. Regards. Wally

SOURCE: 1996 crown victoria has no heat

i think it is the heater control valve i think it is mounted on the firewall by the top close to the hood it will have two black 5/8 hoses attached to it check and make sure it still has the cable attached to it before you replace

good luck here is the (how to) for your car



The heater control valve (sometimes called the water flow valve)controls the flow of coolant into the heater core from the engine.
Heater control valves are operated in three basic ways: by cable,thermostat, or vacuum. Cable-operated valves are controlled directlyfrom the heater control lever on the dashboard.
Cable-operated heater valve used to control the flow of water or coolant through the heater core.Thermostatically controlled valves feature a liquid-filled capillarytube located in the discharge air stream off the heater core thatsenses air temperature and modulates the flow of water to maintain aconstant temperature regardless of engine speed or temperature. Mostheater valves utilized on today's car are vacuum operated. These valvesare normally located in the heater hose line or mounted directly in theengine block.
To replace a heater control valve:

• Refer to your vehicle's service manual to locate the valve.
• Drain or lower the fluid level in the cooling system.
• Unclamp, unbolt and unplug the valve.
• Reverse procedures to complete installation.

SOURCE: Car overheating problem

Try replacing the thermostat. Sometimes they can create a problem like this when they are not opening and closing at the proper temp.

SOURCE: Both radiator cooling fans won't turn on vehicle overheats

The fans come on only when hot or the AC is on. There are many fuses that have to be good for it to work. The fan relay should have 2 pins hot with the key on, The other 2 should be ground. with the key off one should be hot and the other can then be ground the other pins that are ground one of them is the fan. the other becomes ground when the computer turns the fans on. If you don't have a pin thats hot at the relay all the time then theres a blown fuse or even the power wire from the battery at the battery

SOURCE: 1996 honda accord ex (six

if overheats,and trows water or steam,there you can think on the water pump or the thermostat,but you only have a signal problem,try replacing the tempeture sensor.

SOURCE: After a few minutes of driving the engine begins

There could be 3 possible problems here.

If the dashboard is saying the engine is overheating at 90 degrees and there is still cold air coming through then the thermostat could be faulty. I would suggest that you remove the thermostat and place it in a beaker of boiling water. If the top begins to open as the temperature rises, then it is fine. If not, then the thermostat will need to be replaced.

If the thermostat is fine, I would then suggest that you check your coolant levels, the coolant pressure or make sure there isn't a crack in the radiator. If there isn't enough coolant in the system then it won't perform to its highest standards. If the coolant pressure is too low, then it won't be able to cool high temperatures, although 90 degrees isn't very high for the engine to overheat. If your radiator has a crack in it then it will be leaking coolant which would explain a low coolant level and loss of pressure.

A third problem could be air getting into the heating system which will cause air to get trapped in the radiator. This would stop the normal flow of coolant. So now I would suggest checking the cylinder head gasket and do a pressure test to see if there is any air getting into the system.