Question about 1991 GMC K1500

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What would keep your thermostat to open when your gage reads over 230 but if i take the thermostat out it runs were the gage ant reading even in the summer and winter

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  • 134 Answers

The thermostat probably just needs to be replaced they are only like five to en dollars.

Posted on Nov 12, 2010

  • cord west Nov 12, 2010

    i did that 4 times but if i take it out the gage wont hardley read

  • par sims Nov 12, 2010

    usually if the thermostat is not in with the water always cyclying thru your engine temp will not get very high have you tried taking the thermostat out and putting it in a pot and boiling the water to see if you can see in pop open? What kind of car is it?

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1 Answer

My car keep over heating


-Make sure there is full of water (Coolant) in the engine and radiator.
-If it's full but still keep over heat and the fan never turn on when it reach very hot (About 210 to 220*)
If so. Then check the thermostat. it works properly or not when it reach to 175*-180 and up...?
-Here how to test: Remove it from the car and put in a cooking pot
then boil. You need to have a temperature gage. Dip it in and watch. When it reach to 175 to 180 * if the thermostat start to open then it work properly. But if it never open or just little then you need to replace it.
-If it works good then next test the cooling fan switch.
Same procedure but this time you need a voltmeter to check in (Ohm)
-The water need to be above 220* to 230* to be able to
activate the switch ON.
-If No reading at all at 220-230* or more then possibly the switch is not working.
-If it's working then next check the two wire that connect to the switch. It should has 12 volt power there with the key on. If not then the fuse is burn. Check and replace it.

Good Luck

Mai Lor

Sep 15, 2015 | 1999 Buick LeSabre

1 Answer

Temp gauge will not move causing the engiane light to stay on


check your thermostat if temp Gage is not giving reading your thermostat can not be opening and closing to give reading. it must be stuck.

Aug 26, 2014 | Cars & Trucks

1 Answer

I replaced the water pump, thermostat and radiator cap and the temperature gage is jumping up to about 230 and then it cools down to about 200 why is this happening? My truck is a 1995 GMC Sierra


This is happening because you got it right!! It is perfectly normal for the temp gage to indicate those readings. Here's why...

The thermostat has to be heated to its set point, say 195 degree's, before it will open. While it is doing that the engine temperature sensor is "upstream" and it takes a little longer for the thermostat to react. The old thermostat may have had a lower set point or was just weak.

Perfectly normal, nothing to worry about.

Aug 15, 2011 | 1997 GMC Sierra

1 Answer

The heat gage stays at cold but I am still getting some heat, not great heat , but still some, i even lft the car run for 15 min. why is my gage still reading cold?


Usually the symptom you posted means that the thermostat is stuck in the open position or has been removed.
Not only will that give you a no or low heat condition but also will really put a hurt on fuel mileage.
The engine management system thinks the engine is always cold and continues to send an overly rich signal to the fuel system instead of the normal warm engine signal it should have.


replace the thermostat with one rated at 195 degrees (f) and it should be fine.

Nov 03, 2010 | 2000 Ford Taurus

1 Answer

What is the check gauges light


CHECK GAGES light (1) indicates a potential engine failure(low oil pressure, low coolant, coolant overheating) has occurred.
· Check gages and shut down engine. Gages should read as follows: Oil pressure 5 to 10 psi (34 to 69 kPa) at idle; Water Temp gage below 230 degrees (110 C).
· Check engine oil level (Para 2-11) if OIL PRESS gage indicates low reading. Check coolant level (Para 2-11) if Water Temp gage indicates high reading. Notify Unit Maintenance if levels are low.

If CHECK ENGINE light (2) is on, check engine oil pressure gage (3) and water temperature gage (4). If both indicate normal, proceed with mission and then notify Unit Maintenance. If either one does not indicate normal, stop engine immediately and notify Unit Maintenance


Oct 16, 2009 | 1999 GMC Jimmy

5 Answers

Temperature gage not working,gas,gears gage are ok.


located the temp sending unit check that its pluged in, if it is unplug it and ground the wire to something metal (with the switch on) and see if the gauge moves if it does then your temp sending unit is bad and needs replaced

Aug 01, 2009 | 2004 Pontiac Grand Prix

1 Answer

2006 Chev Malibu Maxx


I would check the temperature sender unit/thermocouple.

May 21, 2017 | 2006 Chevrolet Malibu Maxx

1 Answer

Temp gage reads very low


your thermostat is probably stuck open. does the rad get hot. if this helps please rate me thank joe

Nov 23, 2008 | 2000 Pontiac Grand Prix

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