1999 Ford Ranger 3.0 (Vin V) Not Heating Up & Heat Blows Warm?
The issue I'm having is the vehicle gets close to operating temperature, but not quite there, and it won't hold a temperature. Any time I drive slow or come to a stop, the temperature will drop down a bit, then rise again once I start driving. Also, the heat blow warm, then hot, then warm, then hot.
First thought I had was air in the system, since I recently repaired a hose connection with some faulty hose clamps. Bled the system, got a few bubbles, nothing crazy, still nothing.
Next, thought maybe a thermostat issue. Had put in a Stant brand thermostat a few months ago, (when having same issue), but nonetheless, decided worth a shot. Removed the Stant thermostat and purchased a Motorcraft thermostat, that should be OEM. Tested both in a pot of boiling water, both seem to work fine. Not stuck open, not stuck close, nothing.
Put Motorcraft thermostat in for just cause, re-bled system (a lot of air this time), and still no luck.
As I just mentioned, I did have this problem a while ago, and the thermostat didn't fix it then (but always worth a shot), it ended up being the temperature sending unit. I can't remember if it affected my heat or not. I just remember the gauge acting wonky like it is now.
Do you think it could be another temp sending unit? Or another possible issue? I wouldn't imagine the temp sending unit affecting my heat, and I would like to think it would send a CEL (even though it didn't last time either.)
It sounds like your head gasket needs to be replaced. Coolant is leaking out, then when the engine cools air is getting back in preventing the coolant from opening the thermostat up when the engine gets warm again so no heat. Been through the same thing with several cars over the years.
You need to flush the heater core. I have the same engine in my B3000 and saw the same problem. The vanes on your water pump are probably gone too.
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