m35a2 block heater
If you want a heater I think you are better off with the freeze plug type. The problem with putting it on the water pump is that heat rises. It will rise to the top of the pump and hit the closed thermostat and that is as far as it will travel... Essentially you are warming the waterpump only. The freeze plug type goes into the block warming the water in the block transmitting heat to the pistons which is where you want heat when you are starting in cold weather.
yet again green jeepster you are incorrect and giving bad info. but now you have turned to contradicting yourself .a block heater in the water pump will not just heat the water pump as you said since heat doesnt rise as you said .and there is no thermo sihpioning happening in this situation.
thermo sihpioning is when a fluid in a tank is heated to the point where it expands to the point where it no longer fits in the tank. at this point it looks for the path of least resistance.which is a vent or hole that lets the fluid out. when the fluid comes out the hole or vent under pressure it causes a sihpioning effect thus pulling the fluid out of the hole.this is caused by the fluid expanding not by hot fluid going to the top and cold fluid going to the bottom as the fluid will all be the same temp and expands together as a unit.
the cooling system is a seal unit unless the pressure in the system gets higher then the rad cap is set to. then it can become a vented system.if the coolant has expended to the point where it is above the overflow tube thermo sihpioning can occure. but this is not at all what is happening when the engine is not running and the block heater is providing the heat. any tank with fluid in it can become a thermo sihpioning system for instance rear ends can do it either way if the gear lube gets hot to the point where the fluid level gets above the vent it will force fluid out the vent if it does it with enough pressure it can cause it to sihpion all the fluid out or untill the pressure id gone.also if a rear end is hot when submerged unde water as the diff cools it trys to pull air in as the fluid is shrinking.when it does this it will sihpion water into the diff.
transmissions often do this because of the pump or torque converter going bad making excessive heat in the trans to the point where the fluid expands above the vent or filler tube causing it to burp fluid out if the pressure is great enough it will empty out the trans .
like i said you need to know how the cooling system works. thermo sihpioning is not happening . what is happening is exactly what i said in earlier post the dirrect heat from the block heater causes the coolant to expand thus turning dirrect heat into convection heat forcing the coolant away from the heating element making it move. this forces the cold coolant toward the heating element till all the coolant is heated to the max temp the block heater can achieve..the engine block water pump and rad are one resovior they are all connected unless fluid is being force-sihpioned out of the system via the overflow tube no thermo sihpioning is happening. .
but what is happening is and old theory called if you cant dassle us with brilliance baffle us with bullshi it.only thing is we are grown men not kids and we have intellegents and are not falling for it . so please do some research about how heat works and how the cooling system works before posting to a thread giving misinformation.
