overheating after replacing t-stat

[bettabruce]

My truck is still pegging out around 220 or 240 and dropping

back down around 200 after I replaced the thermostat. What

are some other possibilities?

Thanks in advance.

 

[4X4HIGH]

I will make a list of things that need to be checked or replaced that could cause engine overheating.

Radiator cap
Radiator
hoses
belts
water pump
thermostat
clutch fan/electric fan
thermal electric fan switch

Any number of these items can cause an engine to overheat. Did you install the thermostat correctly? The side with the spring goes to the engine side.

 

[70~K5]

Any number of these items can cause an engine to overheat. Did you install the thermostat correctly? The side with the spring goes to the engine side.

I didn't have time to change a blown headgasket and clean out the cooling system one time so I took the merc wagon to a local shop to do the work. Left San Jose at night and drove to Bakersfield after the work was done. The next day when the air temp got hotter and the car overheated. Got a new thermostat for it. When I went to change the Tstat I found the shop had put it in backwards. That sure pissed me off.

 

[spearchucker]

I know this may sound stupid but do you have the fan shroud in place? Or did you do a body lift and modify the shroud?

 

[AkMudr]

After running the engine and expel the air pockets, did you top off the radiator?

 

[folkenheath]

Here's what I'd check, some of it is already mentioned.

1 - top off coolant level
2 - thermostat in backwards
3 - faulty new thermostat

always get the premium thermostats, the cheapo ones almost always go bad within a year or even sooner. Spend the extra few bucks and get the premium thermostats, like the stant premium version, or the robert shaw units are real good ones.