Question about 1997 GMC Sonoma

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I replaced the head gasket an new temp sensor an it still runs hot an it seems like the coolant is not cirulating at all.

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  • 74 Answers

Blockage in cooling system. run flow test.

Posted on Oct 18, 2013

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Posted on Jan 02, 2017

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SOURCE: GMC Sonoma SLE 4.3L 1991- Coolant Temp Gauge Not reading

there are 2 coolant sensors one for gauge and one for ecm

Posted on Jul 23, 2009

johnjohn2
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SOURCE: where is coolant temp sensor located on 2003 gmc

heres a diagram to show you where the coolant temp sensor is located, its behind the alternator on the left side (driverside),the sensor just unplug the connector and then unscrew it and out it comes.

Posted on Jun 21, 2010

emissionwiz
  • 75822 Answers

SOURCE: '08 silverado. dash board diplays, engine running

P0128 OBD-II Trouble Code Technical Description

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
What does that mean?

This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook Symptoms

You will likely not notice any drivability problems other than the MIL illumination.


Causes

A code P0128 may mean that one or more of the following has happened:

Possible Solutions

Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:

  • Verify coolant strength & level
  • Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
  • If the above items check out good, replace the thermostat


Posted on Oct 26, 2010

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2 Answers

Engine is getting hot


Obviously, check the coolant level first.
I'm sure you've already done that, so next would be to replace the thermostat. If the thermostat is sticking in the closed position, the engine will overheat.
It could also be that the radiator is getting plugged, in which case you'd either need a new radiator or you'd need to have the radiator professionally cleaned.
If it's "none of the above", it could be a damaged head gasket. Generally, if the head gasket goes it causes the coolant to blow out the overflow. Once the head gasket has failed the engine just won't hold coolant. If that's the case the only real option is to remove the head, have it machined to make it perfectly flat again, (overheating causes heads to warp slightly and a new head gasket won't seal properly) and reassemble.
Good luck. Hope it's a cheap fix for you.

Jan 30, 2011 | 1992 Honda Accord

1 Answer

What causes pressure to build in radiator and force coolant out the over flow. New radiator also the heater doesnt get hot. Temp seems to stay in mid range


ok, the head engine gasket is burn, to repair remove engine head, make a new plain to head, and replace the gasket, this work will make by mechanic

Jul 03, 2010 | 1997 Toyota Corolla

3 Answers

2002 malibu runs hot.


Sounds like you have a faulty head gasket or maybe a cracked head.This can cause overheating and the check engine light to come on.The code for the o2 sensor is probably caused by coolant getting into the exhaust system and coating the sensor.The coolant fan may work but it cannot remove enough heat from the rad to make the engine cool off.Try some engine coolant stop leak to see if it will help.This maybe only a temperary fix.Let me know if you need more.MOE

Jun 22, 2010 | 2002 Chevrolet Malibu

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

1 Answer

Car running hot


sounds like it is air bound look for a bleeder

Jan 06, 2010 | 2001 Subaru Impreza

2 Answers

1995 Toyota Camry 4 cylinder runs hot


Hi,

Firstly, ensure you have the required 'mixture' of coolant/water (must have required coolant).

Second, I would recommend you re-test all the cooling system sensors again (make sure they're within specifications), in case a new one is faulty.

Third, ensure the new thermostat was of the correct temp setting (they all differ), so that it opens at the required time. Most cooling systems operate within 90 - 100degC.

Fourth, make sure the radiator (and associated hoses) aren't blocked.

If your temp gauge is reading higher than normal, but NOT in the danger zone...then this can be considered normal (especially if you've replaced with new components) and nothing to be concerned about.

However, if the temp gauge IS in the danger zone....then this suggests the coolant is not flowing through the cooling system properly.

If all above components test ok, then it's possible your water pump may not be pumping enough volume.

Cheers,

Aug 16, 2009 | 1995 Toyota Camry

1 Answer

98 cherokee had gunky cooling system, got it flushed and temp gauge was reading low afterwards. diagnostic computer said the cooling system circuit had high input so i replaced one of the temp sensors. now...


STOP DRIVING.

Go to a shop and ask for a cooling system pressure test.

After they pump up the coolant system,they will point out is there any INTERNAL or EXTERNAL leak(s).


Internal leak is the first sign of blowing head gasket. (NOT GOOD)

External leak can just a small hose.


Start monitor cooling loss.

Start monitor the oil level

Change the thermostat and gasket.

The temp sensor is cheap. Change it at the same time.

Use 60/40 coolant mix is you has high odometer reading like 160,000+ miles


DO NOT ALLOW the coolant and oil cross mix.

As soon as it mix,you are ready for a majot head gasket repair.


Good luck.

Jul 15, 2009 | 1999 Jeep Grand Cherokee

1 Answer

1996 Cutlass Supreme-Temp shows hot even after engine rebuilt


is the temp gauge sender new
or the engine cooling fans spinning fast enough
air in the heating pipes ? bleeding

Feb 28, 2017 | 1996 Oldsmobile Cutlass Supreme Coupe

3 Answers

Overheating


you need to have a pressure test done on the coolant system that will determaine if you have a head gasket problem or not

Jul 20, 2008 | 1999 Cadillac DeVille

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