Your description sounds like the thermostat is faulty. If the thermostat is stuck closed, there will be no heat for the interior. New thermostat's are occasionally bad, it has happened to me. The coolant is leaking from what tube? You can verify the thermostat operation, but unfortunately you must remove it from the engine (but with your symptoms that is the most logical failure). Put it into room temperature water in a pot on the stove. Heat the water and check the temperature at which it opens. This is a near foolproof check, but some thermostats are hard to tell when they open. You might have to pull it out of the water (use care it will be hot) to observe the open condition. In general 180-190 degrees F will be the temperature (water boils at sea level at 212 F) at which the thing is nearly fully open. But that depends on your exact version. The temperature is stamped on some them. For further advice read through the previous posts on overheating or thermostat replacement. Your description sounds like the thermostat is faulty. If the thermostat is stuck closed, there will be no heat for the interior. New thermostat's are occasionally bad, it has happened to me. The coolant is leaking from what tube? You can verify the thermostat operation, but unfortunately you must remove it from the engine (but with your symptoms that is the most logical failure). Put it into room temperature water in a pot on the stove. Heat the water and check the temperature at which it opens. This is a near foolproof check, but some thermostats are hard to tell when they open. You might have to pull it out of the water (use care it will be hot) to observe the open condition. In general 180-190 degrees F will be the temperature at which the thing is nearly fully open(water boils at sea level at 212 F). The temperature your thermostat opens depends on your exact version. The temperature is stamped on some them. For further advice read through the previous posts on overheating or thermostat replacement.
Blown head gastet, radiator leaking, thermostat needs to be replaced Blown head gastet, radiator leaking, thermostat needs to be replaced
Is your fan coming on?
I'm not a mechanic but, I had to replace my radiator to fix the overheating problem on my 1994. That was the last thing I replaced after replacing the water pump, thermostat, and replaced my fan with a clutch fan. have not had anymore problems with it overheating once the radiator was replaced. Flush the coolant first then replace the radiator. Hope this helps.
your thermostat is closed. needs to be replaced. inexpensive part but can save your engine from overheating.
Inoperative radiator fans, bad water pump, failed headgasket?
Water pump defective.
Waterpump, thermostat, radiator, radiator hoses.
Ingeneral, the fan will run only if the temperature of the radiator is above the normal range. If the fan is running, then the radiator must be over temp unless the radiator fan thermostat or it's relay is defective. If the radiator truly is over temp then you have a larger over-heating problem You state the thermostat was replaced. if you replaced the fan thermostat then either the radiator really is over temp and it is doing what it should, or there is a problem with the thermostat-fan relay or switch. If you replaced the engine thermostat that controls the flow of coolent between the engine and the radiator, then that probably wasn't your problem and you should look elsewhere for an overheating cause. I would start by determining if the engine actually is overheating or not. If it is, I would look for coolent system problems like the engine thermostat (if you didn't replace it already), water pump, leaks, scale build up in the radiator, or blockages in the system. If the engine isn't overheating then I would consentrate on the fan, fan thermostat and relays.
If you have replaced the water pump then flush the radiator with CLR also check to see if the fan is working properly.
I had replaced the water pump and radiator. This had continued to overheat but not as bad. After replacing the head gasket it was finally fixed. I was able to answer my own question only after replacement.
The top radiator hose is above the thermostat. If the top radiator hose is hot, the thermostat is opening. The thermostat is not the problem. Perhaps the radiator is clogged up or the water pump is bad. Look elsewhere.
radiator fan, head gasket,