Question about 1990 GMC Sierra

1 Answer

My 1990 gmc sierra 1500 temp. guage stuck after new thermostat.

I have replaced the thermostat and check insure that the coolant level and mixture is acurate. I replaced the thermostat in hopes that the temp. guage would read accurately but it is stuck in the highest position. The vehicle isn't over heating but I would really like to fix this for peace of mind. Any advice or solution would be greatly appreciated. Thankyou.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 286 Answers

Hi

Does your temp guage needle drop to Zero when you switch off ignition ?

If not, your temperature transmitter is faulty, or the wire running to it is earthing out somewhere.

Hope this is of help.

Good Luck !

John.

Posted on Jan 16, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Coolant sensor circuit open


no, your coolant sensor is next to your thermostat, replace it and your thermostat also. don't think you have a level sensor !!!!! do you ? this is a GMC, not a BMW. after repair, clear code from computer.

Feb 20, 2013 | 1990 GMC Sierra

2 Answers

I have a 2005 gmc jimmy, the engine light is on and i hooked up my code reader and it says Coolant Temp Below Thermostat Regulating Temp. What does this mean and how do i fix it?


your thermostat is designed to open at a specific temp, for example a 195 thermostat is supposed to start opening at 195 but will not fully open until it reached about 210. Your ECM has determined that your thermostat is not 'closed', but is hung open, not allowing the engine to reach a temp that the computer is set to see. So the thermostat is either malfunctioning, or your temperature sender unit is reporting the wrong thing to the ECU. Probably a good time to replace the thermostat, if the condition persists, replace the sender unit-both items together will cost less than $30 total.

Apr 18, 2011 | GMC Jimmy Cars & Trucks

1 Answer

Engine runs cold. Little heat from heater. Coolant level good


BEST THING TO DO IS REMOVE THERMOSTAT AND REPLACE, IT MOST LIKELY IS STUCK OPEN. THANKS MOTOR62500.

Dec 21, 2010 | 1990 GMC Sierra

2 Answers

1994 GMC 350 Suerra 1500 put in a new thermostat and temperature gauge still will not reach above 160 degrees. Thermostat is a 195 degree.


It depends on what reason you want the vehicle to reach 160 degrees. It seems 160 would be high to run a vehicle at. Nevertheless, if the mixture of anti-freeze and water at the correct mixture. If the mixture is not correct and it is more water than anti-freeze this will effect the heating temperature of the coolant.

Nov 28, 2010 | 1994 GMC Sierra

1 Answer

1990 honda accord temp gauge above hot limit.


Hi there,

Firstly - DO NOT run engine, when guage reads hot, as this will cause costly damage to head gasket & alloy engine head.

The fact that guage takes 1min to read HOT, would confirm the guage IS working properly.

So, other components which are likely to cause hot readings (in this order) are:

- lack of coolant (or leakage somewhere): is there sufficient green coolant at the correct level? Top up mixture to correct level. Repair any leaks.

- collapsed radiator hose: when engine is cold, start engine, then quickly watch both upper & lower radiator hoses to see if either begins to flex inwards (collapse). Replace if either hose is collapsed.

- bad/incorrect thermostat rating : when replacing thermostats, you must ensure it is of the SAME temp rating (they all differ).

- Incorrect Temp sensor rating: the ratings of this sensor must be within manufacturer's spec's.

- bad waterpump: the engine relies on the waterpump to distribute the coolant throughout the entire system. If waterpump is faulty, coolant will not flow quick enough, causing overheating.

If you still believe all of the above components are OK, then have your cooling system "pressure tested". This test should be done, before looking further at other electrical components.

Cheers,

"if this has helped you in any way, please rate this solution"

Jan 27, 2010 | 1990 Honda Accord

2 Answers

2003 gmc sierra temp gauge needle stuck in 5 o


Bad IPC.......If u can round up a tech 2 scanner, do a guage sweep and i bet u will see the temp guage will not operate correctly......a new IPC (Instrument Panel Cluster) is really the only fix. Once installed it has to be programmed. If u need any help send me a return message.

Jan 23, 2010 | 2003 GMC Sierra

2 Answers

2005 GMC Sierra 1500 - heater blows, but only cold air


Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.

Jan 07, 2010 | 2005 GMC Sierra

1 Answer

1995 GMC suburban temp guage pegs high, but heater


Sounds like there may be an air pocket in the system.
Try 'burping' the system. If this still doesn't fix the problem, check the temperature of the heater core hoses (in and out) The inlet should be fairly cool, the other should be piping hot. If they're both cold; the heater core has an internal blockage.

Next, replace the thermostat with a winter (180-195 F) derivative.
Bleed the system accordingly, and keep me posted!

Nov 30, 2009 | 1990 GMC C2500

2 Answers

Loss of power


The problem could be a plugged cat convertor, or fuel filter

Dec 21, 2008 | 2003 GMC Sierra 1500

Not finding what you are looking for?
Cars & Trucks Logo

220 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

60792 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...