how to tell if themo. is opening properly

35

Asked by Feb 27, 2015 at 02:26 PM about the Chevrolet C/K 1500

Question type: Maintenance & Repair

besides sqeezing the upper radiator hose to feel for water flow, is the a better way to test thermostat without  removing it and testing??  truck is a 2005 Silverado 5.3 vortec with 107k miles, and is there a fan relay sensor that gets faulty. fans seem to only come on when air is on, now...... any advise out there??  thanks, kmac.

2 Answers

148,545

Pop radiator cap cold. Start the truck and let it warm up, have patience it might take a few minutes...2 to 5 minutes and watch coolant. It should be full all the way to top. Keep an eye on it, and when temperature gauge gets toward the middle, or less, watch for flow of coolant. If the coolant remains motionless after truck is fully at operating temp, the thermostat is bad, or water pump.

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148,545

As for fan relays, they are in a separate box underhood next to fuse box drivers side. I could not find an image, but you can see it here Chapter 5 Page 135 http://www.manualowl.com/am/Chevrolet/2005-Silverado%201500%20Pickup/Manual/395

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