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I have a 1999 gmc sierra with a 5.3 v8. With my truck running I can squeeze the upper radiator hose all the way flat. My temperature gauge is reading normal and my coolant level in the reservoir is fine. What causes this. Plz help

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It's ok, when it's hot it pressurizes the system, when it cools down the fluid tries to contract, or form vacuum in the system letting you squeeze the hose.

Posted on Nov 19, 2013

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SOURCE: Temperature Gauge in 2000 Honda Civic LX

hi from uk from your symptoms of what happened re temp guage risen suddenly it would indicate the temp sender unit on the engine has blown ie is earthing to engine via its screwthreaded body this is just a matter of replacing with a new sender unit hope this helps

Posted on Jan 05, 2009

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SOURCE: 1994 dodge ram coolant leak

The bypass hose from the waterpump to the intake is leaking. It is about four inches long and is directly under the ac compressor and bracket.

Posted on Jun 09, 2009

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SOURCE: 2001 dodge stratus engine temperature gauge spikes occasionally

Look for a loose connection to the temperature sender unit on the motor.
If all connections OK, you may need a new temp sender unit.

Posted on Jul 28, 2009

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SOURCE: oil is in my engine coolant reservoir as well as my radiator

Most likely the intake manifold has a broken gasket or iteslf is broken.

take it to a shop and have them diagnose it by checking for HC's in your coolant. If there are non present, then it could be inside of the timing cover or the intake. If there are HC's present, you will need a new Head, Engine or just Head Gaskets, but if it's over 150,000 miles, you may want to just buy an engine if that's the case. You can't repair a high mileage engine with new top end components because it will "**** out" or ruin the bottom end shortly after installation.

Good luck! Hope that helps.

P.S. - I have mroe GM's come in with that same symptom than any other vehicle. After your repairs are complete, get rid of the DEXCOOL and go with a good, green antifreeze. It works much better than DEXCOOL.

Kevin, ASE Certified

Posted on Sep 12, 2009

  • 1 Answer

SOURCE: Engine temperature gauge reading on

I have the same thing happen to me. have 2004 GMC Serria 5.3, Engine is not hot. gauge now pointing down - straight down. replaced engine sensor but did not fix problem. I now believe it is the gauge. still troubleshooting. Initial problem indicated a rise in tempature, so I stopped and looked at engine, not hot- plenty of water, hose can hold, drove around some more, then gauge started to climb, stopped again had mechanic check, he had heat sensor and checked engine temp, pretty normal. suspected sensor so replaced. when engine is cold still gauge points straight down.

Posted on Jan 08, 2010

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