Having problems with your 1999 Chevrolet Silverado 1500 ?

How to check thermostat on a 1999 silverado z71

Posted / edited by AnonymousUser on : 12-11-2018

Answers :

When the truck is cold, with the engine off open the hood and search for for the upper radiator hose, look for a place on the hose to put your hand on it, a place that it's not close to any moving parts, (radiator's fan, and pulleys in front of the engine) now that you have fine a good spot on the hose to check the thermostat, go ahead star the engine and just wait while you keep your hand on the hose.
Ones the thermostat gets hot, it will open letting hot antifreeze flow into the radiator that's when your hand will feel this hot change on the radiator hose. It's a good time to take a look to your temperature gauge, it's too hot or too cold?
if the gauge moves higher than normally does, and you didn't feel a hot change on the hose, that means you have a bad thermostat that it's not opening on time or it's not opening at all,
if the gauge it's below than normally does, that means the thermostat it's open all the time

Place the thermostat into water with a thermometer and heat it to boiling.The temperature at which the thermostat opens should be close to what is printed on it. (if it opens at all)
Repair Help & Product Troubleshooting for 1999 Chevrolet Silverado 1500

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