Question about 1998 Chevrolet Astro

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Temp needle goes from 1/4 to 3/4 I am also

Temp needle goes from 1/4 to 3/4 I am also loosing coolant. Would a stuck thermostat cause me to loose coolant?

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No, a stuck thermostat in the closed position would cause it to over heat. You'll have to look around and find where the leak is.

Posted on Feb 02, 2010


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How do I replace a thermostat in a 1999 Ford Explorer?

James from Auto.Repairs
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I'am feeling that your issue is not really with the thermostat my friend. what your describing seems to be the coolant temperature sensor.
And or a loose connection to the sensor 48121ee4-0616-4184-b990-49f490eea9c0.jpg fa29c095-9038-43aa-aeee-f9ad43acb595.jpg

Try turning the key on engine off and look at the coolant gauge
now go out and under the hood it should be in the thermostat housing where the thermostat goes to you should see the #1 picture with 2 wires going to it if you unplug it and go back into the car and look at the gauge it should be in the red hot zone.
if not then your gauge has a short to it lightly with your palm of your hand rap on top of the dash nearest to the gauge and see if it tries to go up if it does then most likely it is a short in the cluster or harness.
and if when cts is unpluged and it goes all the way in the hot zone and when you plug it back in and it goes back into the cold and stay there should be that it is fine just loose connector or needs cleaned if when you wiggle wires and the needle goes up and down then you need to replace the plug and I would still suggest replacing the coolant temp sensor as for it may have been shorted do to the loose connection.

Sep 08, 2014 | Cars & Trucks

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Peugeot 206 cooling fan

See if that gem as a sending unit should be right next to the thermostat standing up like a sore thumb change it and see what happens have a good day thanks

Oct 25, 2017 | Cars & Trucks

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Coolant temp sensor on a 95 chevy 2.2L

It sounds more like the thermostat is sticking.

Apr 23, 2012 | 1995 Chevrolet Cavalier

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My 99 ford f150 pu can sit for 30 to 40 min warming up to operating temp then I leave for work and go aproximatley 15 to 20 miles and loose heater then the engine over heats. After a few min it boils over...

Change the thermostat. The thermostat might be opening too late to circulate. From doing so the coolant is just sitting there getting hotter and hotter which would cause overheating until the stuck thermostat decides to open. I would bring the car to a safe temperature and feel the radiator hoses if one is hot and the other isn't? You have a thermostat problem. Easy fix and cheap. I wouldn't run the vehicle too long until you fix it.

Jan 15, 2011 | Ford F-150 Cars & Trucks

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1998 Ford f-150 with the small v8. Driving a short distance the engine begins to heat up. needle bobs around the middle then shoots up to the max. engine cuts a portion of the power sometimes and check...

From your explanation it seems you are not loosing coolant so I would rule out a head gasket at this point. I would however check the "new" thermostat. Remove the thermostat and put in pot of water. Use a thermometer that will read the boiling point of water (212F 100C). Heat water and whatch that thermostat opens at its designed temperater. You can also see if the thermostat is opening by removing the rad cap when eng cold - start you eng and see if the coolant flows in the rad before the dummy light comes on. If the coolant does not flow your thermostat is stuck or improperly installed. Also be sure that your rad cap is of the proper number of LB rating for your vehice. The steam from your exhaust is normal at cold start up - it is simply condensation evaporating. That is how you can tell if a person has not let their vehicle warm up. If you follow them it will stop after vehicle reaches operating temp. Please let me know if this helps.

Dec 03, 2010 | Ford F-150 Cars & Trucks

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What do the service codes P1281 and P0455 mean?

Engine is Cold Too Long
Engine coolant temperature remains below normal operating temperatures during vehicle travel (Thermostat).
P0455 (M)
Evaporative Emission Control System Leak Detected (large leak)
A large leak has been detected in the evaporative system. See TSB 25-001-02. Also, possible faulty or loose gas cap. Note: The respective Powertrain Diagnostic Procedures Manual will direct the technician to determine if the vehicle evaporative system has an external system leak. Examples of some external system leaks are: a loose gas cap, a disconnected evaporative system hose, or a loose hose connection. Remember that the evaporative system may also have an internal system leak. This internal leak may be caused by an intermittent or permanently stuck open Duty Cycle Purge (DCP) valve. This leak source is considered to be internal because any escaping emissions enter into the engine system and not directly into the atmosphere, unlike an external leak. An internal leak may cause one of the above DTC?s. Possible causes of a stuck open (intermittent or permanent) DCP valve are: 1. Corrosion due to system moisture or possible water intrusion into the system.
P0455 usually a loose/faulty gas cap or cracked or broken hose to the EVAP canister or purge valve.

P1281 The engine coolant temp is too low probably a bad thermostat.

Hope that helps

Oct 12, 2010 | 2003 Jeep Grand Cherokee

1 Answer

My heater is not workin where do i change it

Ok steve- If your heater is blowing air, then you have to look at your thermostat or your heater core....Howver if you arent getting any blown air then you need to look at the blower motor (located on the firewall under the hood, passener side) Check to make sure a wire hasnt came loose and check your fuse box for blown fuses.

If you have heat, but its stuck on defrost, then you have a vaccume leak in the hose that runs off from the intake manifold (replace the complete line-if it broke once it will break again,

And finaly, if you are getting luke warm to almost fridgid air from your heater you either have an air bubble in the system (fix this by having a friend idle the vehicle for you alittle while youo dump coolant back inti the radiator- The other two pootential problems that can cause the same effect are a clogged heater core (clean it out by flushing with water- and possibly a bad thermostat that is stuck in the open position hence cold air because there is nothing preventing the coolant from cycling arround and warming up to the proper temp so the system doesnt blow heated air...This can be verified by watching your temp gauge in the car. If the needle goes half way then drops to 1/4 of the way then the thermostst is fine, however if it is stuck open, there wont be any fluctuation to the needle at all because the coolant in the block will be almost the same temp as the coolant in the radiatior due to a non stop cycle. Hope this helped you out take care and thanks for using

Jan 20, 2010 | 2000 BMW 3 Series

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1995 Z28 overheating and loosing power

It sounds like your cooling system is becoming clogged with debris. Flush your radiator, replace the temperature sensor and the thermostat. Also, Griffin makes great after market high capacity aluminum radiators, a little pricey, but worth the money the event you have to replace the radiator due leaks and corrosion.


Oct 11, 2008 | 1995 Chevrolet Camaro

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