Intake manifold gasket
Could be: Low coolant in the radiator - or - thermostat stuck open - or - heater core plugged.
Sounds like a brake problem. Need to pull wheels and check the brakes.
Could be,a stuck closed thermostat,low on coolant which tells you have a leak in the system,cooling fan(s) or fan clutch not operational,debris blocking air flow thru radiator,
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You listed this in a Chevrolet suburban category so I assume that is what you have. On the Chevrolet suburban you must drop the fuel tank in order to access the fuel pump. There possibly could be an access panel above the tank inside the vehicle so be sure and take a look, but it is doubtful.
well it depends where you live. The most efficient coolant is plain old water, and if you live in an area that rarely freezes for more than a day or two at a time then that's all you should put in - just water. If you live in an area where freezing could be a problem then put in a mixture of 2 parts water, one part antifreeze/coolant. Any kind will do, they are all the same. All "coolant" is is water with a little antifreeze in it.
Could be a head gasket problem. Might want to try a compression check to see what that tells ya.
It could be symptomatic of a larger problem. The coolant may not be circulating properly, or the indicator panel or car's computer could be developing trouble.
The coolant leak is pretty cut and dry - you have a leak somewhere. The lukewarm heat (assuming you're referring to the car's heater) could be for a number of reasons. Insufficient coolant could be one of those. Your coolant could be burnt out. It could be a problem with one of your heater hoses. You could have a worn out heater core.
Replacing the 1997 Chevrolet suburban blower motor resistor can correct your air output issue. The air output issue could because by other things.
Could be, a bad thermostat, low on engine coolant (leak), a faulty fan clutch, a missing or damaged fan shroud, a plugged radiator,
You could possibly have a circulation problem, or a over heating problem. Need more info.