My mpv is overheating and not pttin out any heat in the cab. I replaced the stat and the problem remains...what is the solution to this...btw, the h2o pump isn't leaking either..

dash HVAC heater fails.
well there are only 2 causes. (macro viewed)
engine bay or cab failures.
engine is not hot 180F up. thermostat bad.
we scan the PCM see PID data ECT is 150f and bingo bad stat. if stuck there. it is bad. end store and simple fix. new stat.

all fuses checked for good.
next is cause #2 cab parts failing in dash. heater box.

1. blower dead on high you never said it works/?
2. blend door struck on cold. bad damper hinge stuck or
3. bad blend door actuator motor dead.
4. dash controls bad.

there is a test for each case covered in the service manual, buy one>?

probably you changed thermostat with different temperature value... so change it to thermostat with same value like the old one

sounds like the radiator is blocked either coolant flow or ext air flow through the matrix the thermostat can get ruined when the system overheats so allways change the stat after a overheat problem GET THE RAD CHECKED FIRST if ok check the coolant pump

have you checked that the electric cooling fan is working ?? if so check the thirmostat by removing and placeing in boiling water and placeing a thirmomitor in the wather the stat should open at aprox 88- 92 deg, failing that have the head gasket checked

thermostat more than likely backwards in the housing.

indicates no0t enough coolant in the system probably from an air lock that has not been bled out properly
overheating can be from head gaskets /cracked head or problem viscous fan hub

Hello, if you've changed the pump. cap. and t-stat and its overheating still i need to say that just because you replaced those parts doesnt necissarily mean they work. Im mainly talking about the t-stat and cap. was this your first time installing a tstat? They go in a certain way. Make sure you put it in the right direction. Your vehicles engine might require you to purge your coolant system of all air. On some cars air will remain trapped in the area right at the tstat causing it not to work therefore not opening up and no t circulating the coolant. I would start there myself. If thats not the case, next id flush the radiator. I would like to know what the problem symptoms were wich led yoy to replace those parts please.

If it overheated i would replace the thermostant and gasket, also make sure its full of coolant, after replacing the thermostat you may have air in system so let it run until stat opens it may boil over a little until stat opens then it will **** coolant into block when that happens fill with coolant, you will need to let it idle for a while before new stat opens, hope this helps, good luck, i think the stat went bad the first time it overheated.

overheating can be caused by stuck shut t-stat but u would have heat at-stat stuck open no overheating and no heat. a waterpump that the impeller broke or rotted of can cause your problem but rarly seen does your fan work or any leakage or low coolant can cause air pocket and overheating no heat. let me know and we go foward

check radiator fan and radiator if its ok cylender head problem after repair it .