What is the output of coolant system - Cars & Trucks

Here is an explanation from the manual for the 4.3L spark control:

Description & Operation The HEI (EST) distributor uses a modified ignition module. The module has seven or eight terminals instead of the four used without EST. Different terminal arrangements are used, depending upon engine application.
To properly control ignition/combustion timing, the ECM needs to know the following information:

• Crankshaft position
• Engine speed (rpm)
• Engine load (manifold pressure or vacuum)
• Atmospheric (barometric) pressure
• Engine temperature
• Transmission gear position (certain models)

The ECM uses information from the MAP and coolant sensors in addition to rpm to calculate spark advance as follows:

• Low MAP output voltage would require MORE spark advance.
• Cold engine would require MORE spark advance.
• High MAP output voltage would require LESS spark advance.
• Hot engine would require LESS spark advance.

Incorrect operation of the EST system can cause the following:

• Detonation-low MAP output or high resistance in the coolant sensor circuit.
• Poor performance-high MAP output or low resistance in the coolant sensor circuit.

The EST system consists of the distributor module, ECM and its connecting wires.
Copyright ©2020 by Chilton, an imprint of Cengage Learning

Just need to replace the sensor, first have diagnostic run and the sensor's output checked, if possible. As long as car does not "Over Heat" shouldn't effect the operation of the engine. Make certain your Coolant system is full and at 50/50 Water and antifreeze,

if the car in the process of operation, coolant temperature gauge indicatorquickly reached 100 degree, or launch in the cold car, engine coolanttemperature rises rapidly to boiling, to make up for the coolant to normal, but the engine power output decreased significantly, the mechanical system of engine system failure. The cause of the fault of cooling system are: seriousWater Leakage; cylinder pad insulation jacket and cylinder impact; the thermostat main valve off; fan belt loosening or fracture; pump shaft and impeller loose; fan clutch side. Use obd2 for automotive diagnostics , you can improve vehicle safety performance and driving more safer.

I'm assuming the heater blower motor does not stop working, but that the heater output temperature drops. Two possibilities: 1) Coolant level is low, 2) some type of blockage is allowing engine coolant to circulate only at higher rpm. Check the coolant level. If it's ok and this is an older vehicle that has never had the coolant system flushed, there may be buildup in the system that blocks circulation in the heater core.

It sounds like thermostat (in coolant system) needs to be replaced. They only control you have for temps are the dials on dash, but if coolant thermostat is sticking you're limited to what it outputs. Replace coolant thermostat and you should be "good to go"

Your Ranger is 19 years old. You need to perform a complete cooling system service. Drain the coolant and flush the system with a commercial flush as directed on the can. Make sure the heater is set to hot. Replace the thermostat. On your Ranger it is difficult to access as it is hidden down low on the engine where the upper radiator hose connects to the engine. Refill it with a 50/50 mix of antifreeze and distilled water. While performing this service inspect and replace any hoses that are suspect.

radiator coolant level and overflow tank low fill overflow tank to max remove radiator cap top off coolant level, start car and let it warm up for 5 or 10 minutes, if fluid level drops top off radiator with coolant again check for heat output if OK replace cap DONE else have someone increase engine RPMs (around 3500rpm) top off coolant level (there was air in system) replace radiator cap

Yea, theres an air bubble in your coolant system. Check your coolant level, and top off the fluids.

When your jeep is going down the road the water pump is cycling the coolant, but when you are idling there isnt enough spin on the water pump to push enough coolant to compensate for the air in the system

I hate to be the barer of bad news, but may be the head gasket.

My car started with rough idle. Then very hard to start in cold weather. Next started overheating, but no output from heater. Trickling sound from behind dash board. Overflow bottle overflowing.......

I replaced the water pump, radiator cap, thermostat, coolant, fan belts, power flushed the system. Nothing worked. Some research gave me the answer.

The head gasket leak was allowing exhaust gases to enter the cooling system, displacing the coolant. After use, as engine cools, coolant is sucked back into the system and coolant seeps into the cylinder. This gets worse over time.

First thing you'll notice is the rough idle as the spark plug burns off the coolant in the cylinder. (This is especially true at low temperatures.) If it is the head gasket, the other symptoms will follow as time goes by.

replace the waterpump and thermostat