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Well if by hot you mean the engine overheats the answer is simple. While driving in town ( city driving ) you engine is not pushed as hard as on the highway. On the highway the engine is getting a constant flow of gas with no break where as in the city you drive to a certain speed letting of the gas when the speed is reached, slow down, or stop. The engine is also going at around 5000 rpms depending on your vehicle then the rpms go down when it shifts but if you slow up it goes back up to the high rpm's.
While there's probably nothing technically wrong with the above answer, it also doesn't help with your overheating problem.
If the engine gets hot at highway speeds and cools off when you slow down, there is likely a restriction in the cooling system. Could be a bad thermostat, plugged radiator, or perhaps plugged water passages in the block or heads. Start with the thermostat since it's the cheapest and easiest thing to try. Sometimes a radiator can be flushed, but usually you end up buying a new one. If the block is plugged up, it is probably a very old, poorly maintained engine and will need to be disassembled and cleaned.
If this is a new combination and has never cooled properly, perhaps you just need a bigger radiator.
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Why would a car run hot in town but not on the highway with a new thermostat and new sensor water pump is not leaking and fan runs when directly wired to a battery but not hooked up in car?
Thermal relay is defective causing the fans not to run when they should. Replace the relay.
Why Lincoln Town Car temp light flashing?
Because your car is getting hot!
Why is it When you drive a car in city traffic for some time the brakes become quite hot?
Because you are using them more often than you would if you were highway driving.
What are the release dates for Big Town - 1950 Hot Car Murder 5-8?
Big Town - 1950 Hot Car Murder 5-8 was released on: USA: 29 November 1954
Why would a 1992 Lincoln Town Car not blow hot air after heater core has been replaced?
I suggest replacing the thermostat, that might work.
What could the problem be if 95 town car is running hot?
The fan or water pump,
Why does your Lincoln town car shut down when hot?
Safty featcher so as not to destroy engine
Why would a car only overheat when driving in town example stop light to stop light or in neighborhoods and not on the highway also when I idle for more than 15 mins my car gets hot how do I fix this?
Your electric fans have stopped working. Turn on you A/C with the hood open. If no fan is running either the fan is bad (most likely) or the relay is bad (not as likely). Y-THINK-Y
Can you eat a hamburger that's been in a hot car all day?
it would depend on how hot the car is and how thick the burger is, but I would never do it
Your 2003 jeep Cherokee runs hot in town but not on highway?
more airflow over the radiator keeps it cool on the highway, in town more sitting in traffic and lower speeds let it run hotter. If it is nearly over heating start with the easy things check the radiator fluid. if it is full then it is probably the thermostat sticking either open or closed. since it runs cooler on the highway I would think it is stuck open allowing the water to circulate through the radiator.
What does it mean when you only get heat from your car when you are driving highway speeds?
If by this you mean only "hot heat" when drive at highway speeds likely thermostat bad and/or almost stuck and takes long time warm up from high engine RPM during highway driving.
1988 Lincoln town car air conditioning blowing hot and cold air?
If a 1988 Lincoln Town Car is blowing both hot and cold air when the air conditioning is on, there could be a problem with the thermostat. There might also be a problem with the level of refrigerant in the air conditioning pump.
