Aquacal and Rheem make good pool heat pumps and have better warranties. The Aquacal SS175 has a 7 year parts, 2 year labor, 7 year compressor and lifetime heat exchanger warranty. The Rheem M8350ti has a similar warranty but only has a 10 year warranty on the heat exchanger.
When the heater is off but heat is still coming out of the vent, it could be due to residual heat from the engine or a problem with the cooling system. This could be a sign of a faulty heater control valve or a malfunctioning blend door. It's best to have a mechanic inspect the vehicle to diagnose and fix the issue.
you can tell if your heater cooling system/core is broke as the car will not produce heat when you turn on the heat inside the car. if it is not blowing heat there could there is a problem. the heater core itself should look like a small radiater, if that is clogged it could cause a problem. can also possibly fix this by doing a cooling system flush this will clear any blockages or expose the problem. if flush works, consider the thermostat. that also will cause no heat on inside.
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.
I would first check either the controls to the front heater core or a blocked front heater core. It could also be a blocked or missing heater hose to the front heater core, although that seems quite unlikley.
Your heater coil is bad.
Whats the problem? Blows cold air with the heat settings on?
No there is not. Whats the problem no heat ?? If so try this, reverse the heater hoses on the heater core and then go drive the truck and see if you get heat.
Clogged Heater core... common problem with 2002 dodge
somtimes a mouse moves into the blower motor and makes a nest ?
Do you have a pool heater? The oil could be "white oil," a refined mineral oil. Indicates a problem with the heat exchanger. Your heater doesn't need to be running for this problem to occur.
It could possibly be a clogged heater core