water temp switch??????????

does anyone know what the water temp switch does. its the switch thats in the bottom of the radiator. if anyone can explain what it is and what it does that would be helpful.thanx

im no where near 100% sure but id imagine its the switch the send the hot water from the engine into the radiator to cool off. so u have a constant flow

it has something to do with the computer to help control the carb the hotter the collent gets it will change the air to fuel setup when i got my new Rad my old one had it busted so i never installed it did not notice anything

tells the computer how rich to make the fuel coming in. it will run rich until the thermostat opens and allows the hot water in the radiator and then it leans out the system to get better mileage.

thanks guys. i have a 89 b2200 and that switch broke and im having probloms getting this thing to pass CA smog. i have no vacuum coming from my egr at all even at 3000 rpms and the book said this could cause that. and that would probalby be why i have a hesitation when i get on it.

The temp switch you guys are thinking of is the green one in the side of the intake manifold.

The one in the bottom of the radiator is connected directly to the PTC Heater Relay to cut on the heater under the carb if radiator coolant temp is below 63 degrees F. This info comes directly out of the Factory manual.

The actual coolant control in all 93 and earlier mazda pickups is done by the thermostat, even in new cars this is the primary device for coolant control although many of your newer cars have secondary pumps that kick on after the engine is off to reduce heat soak temperatures.