1995 blazer W engine

The truck won’t get above 160-170. Weather has been in the 40s

These are the things I have replaced done
New radiator and hoses
i tried 2 different 195 thermostats
new fan clutch
both temp sensors,cpu and gauge
and tried the bleeding procedure 3 times
and I blocked the radiator with cardboard( that does help getting it hotter faster)

runs good great heat, iffy MPG13-15 but it’s on a/t 31s with a large roof rack
is there anything I’m missing to check?

thanks in advance

 

Based on what you have replaced and done, perhaps your temperature gauge is not accurate? Do you have a way to measure the temperature? An IR remote thermometer would likely be the easiest and pretty accurate but a thermocouple with a gauge would be good too.

 

Amazon same day shipping. I’m guessing upper radiator hose or thermostat housing is the best bet for a comparison temp?

 

There and where ever the temp sensor is located. The former will tell you what the temperature of the water is where it passes through the thermostat so you can check if the thermostat is working as expected, and the latter will tell you if there is a difference between the actual temperature and what your gauge meter reads. I'd say that a few degrees wiggle room is to be expected for both measurements.

I don't know where the temp sensor is located but often they are near or on the thermostat housing.

 

The gauge sensor is on the drivers side of the block near the knock sensor, might be hard to get a reading that close to the exhaust.

soo if the gauge matches the thermometer read. Is there any other reason why this thing is running so cold… cavet I didn’t own this truck last winter. Could this be its norm?

 

Dash reading 160-170. One line above the 1/4 mark
IR temp gun: heater core inlet hose 171
thermostat housing 179

so I’m thinking the gauge is correct

 

I find it hard to imagine why the engine would run cold if the thermostat is functioning properly and the coolant level is correct.

 

Been swapping out thermostat and trying that rubber o ring thing in different ways still can get any hotter.

 

I'm not familiar with that. Can you describe what you are doing or post a link?

 

This goes around the as it sits in the depression on the block