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Spot on! (or close enough) The fact that your upper radiator hose and left radiator tank are cold when the crossover is hot indicates the thermostat is remaining closed. Take the truck for a long drive with the cardboard in place to see if the upper hose gets hot, which would indicate the...

Insufficient Heat Diagnosis Flowchart So, here is how GM instructed it's service technicians on how to diagnose insufficient heat being generated to warm up the cab for all 1984 truck models. You will note the use of a 220 degree thermometer to measure the air output at the dump door. You...

:funny:

OK, so those heater hoses should be getting pretty warm to the touch, especially the one attached to the crossover. Remember, there is nothing preventing the flow of coolant through your heater core when the engine is running. So, if both are nice and toasty you have plenty of heated coolant...

How a thermostat works ... I don't believe it would. The thermostat is a valve that is either closed or open. Now, upside down is a relative term. There is the orientation parallel to the axis in which there is a cone shaped end and a plug shaped end. The plug is sometimes referred to as...

Let's start by checking how hot that crossover and heater hose are getting. That will narrow down where to look next. Should take 15 minutes or so. Enjoy the anniversary celebration!

I guess it depends on what you are trying to do. If you want to check to see if the cable is actuating the door, you just need to look under the dash and watch as you move the lever. If you want to see what condition the door is in then I see no other options but to remove the assembly from...

You can easily tell if your clutch is the thermal or non-thermal type. The face of the clutch closest to the radiator will have a bi-metallic thermostatic coil spring at the axis (center) of the clutch. Coil spring = thermal. No coil spring = non-thermal. AC Delco online catalog replacement...

I concur ...

Respectfully, let's see what he finds doing careful methodical testing. One step at a time. If that engine is running, it is generating waste heat. No ifs, ands or buts. That heat must be going somewhere. No choice. Otherwise that truck would be overheating. You cannot defy the laws of...

Let's start simple. The stock heating system on the GM Square Body trucks is dead simple. Coolant is always running through the heater core on a properly functioning system regardless of cab temp setting. The cab temp setting changes the position of an air blend door that directs more or...