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To add to last question i changed the radiator ,heater core water pump thermonstate 195' checked gauge it will peg out when u ground it im stumped

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  • Cars & Trucks Master
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What make , model an year vehicle ! Ground what ? Most vehicle's from 96 on the coolant sensor is a input to the PCM - engine computer . The info it gets from the temp sensor is sent on a serial data communication network to the instrument cluster . GM had bad stepper motors inside the instrument cluster . You like making parts stores rich too . Why don't you take it to a qualified repair shop ! Instead of thinking your a TECH .

Posted on Dec 14, 2016

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Posted on Jan 02, 2017

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2 Answers

Heat stops blowing with increased rpm.


I would say that the replacement radiator has blocked cores and is restricting the flow at rpms. Even with a new core the top hose will be hot and the bottom will be quite warm to the touch as there is never 100% transfer of heat during the length of the cores. When a radiator is left for a period of time Assuming it was out of the vehicle the cores block up when the mud in the radiator dries out It has always been good practice to remove the radiator and keep it full of water if you want to use it in the future. So the answer to this problem is a new (brand new) radiator.

Nov 11, 2013 | Cars & Trucks

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What causes hyundai Elantra 2002 tempature gauge fluctuates between normal and hot


The thermostat "seals" the cool coolant giving up (rejecting) heat in the radiator & heater core from the hot coolant absorbing heat in the running engine "block".

When the coolant in the engine reaches a specific temperature (180 ~ 195 degrees) as determined by the value selected by manufacturer or when replaced, it opens and allows the hot coolant in the engine block to be pumped out to the radiatot & heater core for cooling and the cool coolant in the radiator / heater core is pumped into the engine block - replacing the hot coolant. The thermostat senses cool coolant in the engine block and seals shut until the temperature of the coolant in the engine block rises to 180 ~ 195 degrees again. This process continues over and over for as long as needed.

You should check to make sure that the coolant level in the reservoir / radiator is sufficient by checking when cold. Do NOT remove a radiator cap when it is hot! With the cap off, start the engine and add additional coolant as the engine warms up to normal operating temperature. If coolant levels are ok, the trouble could be related to the thermostat or possibly a faulty temperature sending switch. This means that the temperature of the coolant is fine - but the switch or sensor that converts the temperature to a voltage for the gauge on yur dashboard is the problem.

If the temperature is fluctuating up and down, you should have it fixed. Good luck!

Apr 12, 2013 | 2002 Hyundai Elantra GT

2 Answers

1998 Pontiac Firebird 3800 V6 overheating


did you check your radiator to see if it needs to be replaced?
If it is the original my be clogged.
the no heat did you check the flapper door and dash control to see if they are working?

May 02, 2017 | Pontiac Firebird Cars & Trucks

1 Answer

Temperature guage goes to high, but it doesn't appear that the van is overheating (no steam/fluid leaking) Radiator & thermostat were recently replaced. Guage will jump to high when idle, but...


FLUSH RADIATOR, HEATER CORE AND ENGINE BLOCK.ADD 50 / 50 ANTIFREEZE AND WATER ALSO REPLACE RADIATOR PRESSURE CAP.IF TEMPERATURE GAUGE STILL STAY HIGH THE ENGINE COOLANT TEMPERATURE SENSOR COULD BE FAULTY.

Aug 21, 2011 | 1996 Ford Econoline

1 Answer

The temp guage pegs out on my 2005 uplander. I have changed the thermostat and flushed the radiator. The water pump seems fine and both radiator hoses get hot after it runs for a while. The fans kick on...


Having a blocked heater core will not make the engine over heat. You will just not get any of the heat from the fluid that would normally be pushed through the heater core because your core or cores are blocked (I think you have two cores if you have a rear heater.). The engine does not need your interior heater cores to keep cool. When you select "heat" on your console, either a valve opens up and allows fluid to move through the lines to your heater cores and or an air duct opens to the cores to blow air across them...


Did your heater work before your work?

Does the gauge stay pegged or does it fluctuate?


If your gauge now fluctuates after your work, it would indicate to me that there is air trapped in the engine or bubbles passing by. The air does not cool the engine block as well so the temp will rise quickly. It will then cool a bit as the coolant splashes by. If your gauge is staying hot and never moves, it could mean: you are missing a lot of coolant, trapped air near the temp sender, or your thermostat is not opening. A closed thermostat would make the gauge go all the way hot and stay hot. The thermostat can be checked with a pan of boiling water on the stove. When boiling, put the thermostat in the water and check to see if it opens. It is also important that the thermostat is installed in the correct direction. The temp sensor much be on the engine side. I am also assuming your pump shaft is not sheared and is still connected to the impeller and it is spinning as well. You can take your belt off and move it by hand to see if you feel any resistance. If you are sure the thermostat is opening and the pump circulating, I would then check and see if you have air in trapped in your system. I looked at my Uplander and noted a lot of hoses and metal pipes at a higher level than the filler neck of the radiator. Perhaps, when you filled your system back up from the radiator, that a lot of air got trapped in the upper part of the engine and the heater lines. I also saw that there were little brass valves near were the hoses connect near the pump and on the driver side. I would suggest running the engine and open and close the little brass check valve on the divers side to see if you have fluid or just air coming out. I wouldn

Nov 12, 2010 | 2005 Chevrolet Uplander

1 Answer

Where is heater control valve on 2003 dodge ram pick up


THERE IS NO HEATER CONTROL VALVE ON THE WATER HOSES. NEW HEATER CORE. INLET LINE right before heater core hot, outlet after core look warm. Burped cooling system 5 times with engine at operating temp. Installed homade burp VALVE right after heater core outlet(high part of hose). Still no heat. Removed water pump, impeller still in good shape not stripped off shaft. Removed heater core hoses flushed water thrue the connections on the block to the water pump INLET and outlet. flushed water thrue heater core and hoses. Going to put it back togeter today. Used known good gauge to check water temp for operating temp in test. 195 f

Oct 22, 2010 | 1997 Dodge Ram 1500 Club Cab

1 Answer

Car is running hotter than I like. I just had the heater core, radiator hoses, reservoir cap,replaced, put a 195 thermostat in it, new antifreeze and had the guy check if the radiator was plugged. All was...


You would have to install a new rad.( you don't mention that it was ever changed 1996 ) and change the water pump if you want to eliminate all possible problems. Then take it from there. Also, have the timing checked.

Jan 18, 2010 | 1996 Chevrolet Cavalier

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!

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2 Answers

I have a 2001 1500 dodge ram it has no heat replaced heater core water pump thermostat radiator. I just blows warm air. what do I do now?


are heater inlet outlet mix valves standard for all dodge heater cores. I have 2001 dodge cummings blows warm air not hot when gauge is 195 degrees would there be a mix valve under the dash because it is not inline outside the wall

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2 Answers

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BLEND DOOR STUCK OR BROKEN. NEEDS TO REMOVE DASH AND HEATER/EVAP CORE BOS TO REPAIR REPLACE.

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