Over Heating problems

Good evening,

You should not see circulation right away. The thermostat should be closed until it reaches 195 degrees. If it is open, then the coolant is not circulating at the back of the block and could damage the heads and block.

https://www.2carpros.com/articles/engine-overheating-or-running-hot

Did you take the temperature of the radiator at the top and bottom when it is hot?

I would also do a compression test to look for any coolant in the cylinders.

https://www.2carpros.com/articles/how-to-test-engine-compression

Roy

Unless your radiator hoses are sucking flat,

I might give some thought to radiator replacement, if it's original, it's no longer the Spring chicken it used to be. They get deposits and build up over the years, parts store flushes just can't do the job.

Anymore, unless they are old school brass, they cannot be taken apart/ vatted and reassembled. Usually they are now disposable. Parts store flushes just can't do the job.

I looked it up at Advance Auto Parts (online) They show 3 different radiators all below $155 for your truck. Read to insure they (one) are exactly what yours requires

This might help you out too.

If you are thrifty, coupons and promo codes found on the net can really knock the cost of parts down! (Older example with my pic below, it worked well)

Keep us posted.

The Medic

Hi,

It could also be the fan clutch is faulty. It is a silicone clutch and it could not working be properly and you are not getting enough air through the radiator. Here is a good way to check the operation of the fan clutch. Let us know it this information was helpful.

Thank you
Joe T.

1. Start with cool engine to ensure complete fan clutch disengagement.

2. If fan and clutch assembly free wheels with no drag (revolves more than five times when spun by hand), replace clutch. If clutch performs properly with slight drag, proceed to following step.

3. Position thermometer so it is located between fan blades and radiator, noting the following:
a. Insert thermometer sensor through one of existing holes in fan shroud or place between radiator and shroud. It may be necessary to drill a 3/16 inch hole in fan shroud to insert thermometer.
B. Check for adequate clearance between fan blades and thermometer sensor before starting engine, as damage could occur.

4. With thermometer in position, cover radiator grill sufficiently to induce high engine temperature.

5. Start engine, then turn on air conditioning and operate at 2000 RPM.

6. Observe thermometer reading when clutch disengages, noting the following:
a. It will take approximately five to ten minutes for temperature to become high enough to allow engagement of fan clutch. This will be indicated by a 5-15 degrees F drop in thermometer reading.
B. If clutch did not engage between 150-195 degrees F, unit should be replaced. Ensure fan clutch was disengaged at beginning of test.
C. If no sharp increase in fan noise or temperature drop was observed and fan noise level was constantly high from start of test to 190 degrees F, unit should be replaced. Do not continue this test past thermometer reading of 190 degrees F to prevent engine overheating.

7. As soon as clutch engages, remove radiator grill cover and turn A/C off to assist in engine cooling. Run engine at approximately 1500 RPM.

8. After several minutes, fan clutch should disengage as indicated by reduction in fan speed and roar. If fan clutch fails to function as described, replace it.

Did you check the temperature of the radiator cores at the top and bottom when it is hot as I suggested in the beginning?

Roy