Question about 2003 Volkswagen Passat

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My coolant temp gauge always reads 190 even if i let it sit overnight and start it up in the morning

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Posted on Jan 02, 2017

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SOURCE: 1994 laredo jeep overheating

My 1999 Jeep Grand Cherokee has run hot for the last year. The garage changed the thermostat 3 times and didn't solve the problem. Decided to look at it myself. Thought the radiator might be the problem - clogged? To remove the radiator the headlights, grille, and bumper cover etc needed to be removed. Turned out the radiator was clean inside and held pressure. Problem was junk between the fins stopping the air flow. Radiator shop blew out between the fins with air and it's worked great since.No more overheating.

Posted on Jul 15, 2008

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68 cutlas
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SOURCE: Temp Gauge Reads Hot all the time and no heat

air sometimes gets trapped in the heater hoses or heatercore itself pull the upper heater hose off the block,hold it in the air and try to fill it,that should push the air out of the line

Posted on Jan 26, 2009

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SOURCE: gauges misreading bigtime

instrument cluster and buy and extra per gm quality

Posted on Feb 02, 2009

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SOURCE: temp gauge or thermostat light is flashing

This sounds like perhaps the coolant level sensor in the coolant reservoir is stuck or faulty... OR the wiring to the sensor is grounding out (shorting)... Hope this helps...;-)

Posted on Apr 13, 2009

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SOURCE: Flashing Temp indicator light, after 5 min on a cool morning

Assuming its flashing red, check the coolant level.I had the same problem with my Cabrio and it turned out to be a leak. I have seen one flash blue on my friends new Beetle but that car had way worse issues. 

Posted on Jun 28, 2009

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1 Answer

Car has been sitting overnight thermostat recently replaced as well as the temp sensor still reads hot


If vehicle reads hot when it sits overnight and is actually cold, there is an issue with the temp gauge... temp sensor... wiring.... . You didn't state year/make/ model so it could even be a BCM issue.

Aug 03, 2015 | Cars & Trucks

1 Answer

Temp gauge stays cold


If the thermostat is bad (i.e. stuck open at all times), this would allow coolant to circulate in the engine even when it is below the desired operating temperature. This leads to OVERcooling of the engine. You can either replace the thermostat as a first step or remove it and test it -- closed when cold, open when heated above 190-200F.

Jan 30, 2014 | Chevrolet Malibu Cars & Trucks

1 Answer

2003 vw 18.t temp lights goes on but temp gauges read normal


If your coolant overflow is bubbling then regardless of what your gauge says you are having overheating issues. If your coolant is missing with no aparent leaks then you need to check your oil for a milky consistency and apearance which would most likely point to a blown head gasket. This would also explain overheating. Hope this helps

Dec 27, 2013 | Volkswagen Jetta Cars & Trucks

1 Answer

Coolant temp guage jumps from C to H


If that is a manual gauge it sounds like the gauge may be the problem. If its electronic, you may have air caught in the cooling system. I'll bet u its a manual gauge & its NG. LOL good luck

Jul 16, 2017 | Cars & Trucks

1 Answer

Car won't stay running after sits overnight and runs good after you do get it started


In the morning, turn key to on position for 5 seconds. Do not crank.Then turn off for 5 seconds. Repeat this about 5 times. Then try to start. If engine starts right up, the fuel pump check valve is bad. Meaning all fuel in fuel line is returning to the tank when car sits overnight. The only fix is to replace fuel pump. If that doesn't work, replace coolant temp. sensor for the computer. About a 12.00 part.

Feb 05, 2012 | 1994 Pontiac Grand Prix

1 Answer

Ive been having issues with my temp gauge sometimes it will move but it will just drop back down randomly and go back up again and sometimes it wont do anything but its never just worked properly sitting...


Its fine, temp needle going up shows that engine is warming up and as soon as the radiator fan starts, temp of coolant drop and this is shown by the temp gauge needle. In most cars (even mine) it stays in middle most of the time unless you are in a traffic with AC on, it will show up more temp. What you can do is get the radiator flushed and coolant changed. Also check the water pump. To do so when engine is cold (in first start in morning), open the radiator cap and ask someone to rev the engine. If the coolant level moves up and down then water pump is also fine.

Aug 15, 2011 | 1990 Ford F150

1 Answer

The engine idle fluctuates the temp gauge always reads hot even on a cold start radiator is always hot


Is it actually hot the radiator Imean. If so check thermostat ,coolant level,of both ok than faulty guage.

Oct 02, 2009 | 1998 Honda Civic

2 Answers

Flashing Temp indicator light, after 5 min on a cool morning


Its a Low Coolant indication. Fill the reservoir to at least the MIN level.

Jun 02, 2009 | 2002 Volkswagen Cabrio

2 Answers

How do you know if your engine is overheating? the coolant says 210 degrees wut do i do


When your engine is operating normally, the temp on the gauge should be between 190 and 225. The thermostat is set to open at 190 and this controls minimum engine temp. If you sit in traffic the temp will climb to 225 and then the cooling fan will begin to operate to make sure that you don't overheat.You know that water boils at 212 but you have to add 10 degrees for every pound of pressure the rad cap is set to. Also your coolant has antifreeze in it which raises the boiling point even more. A normal overheat condition of your engine would be 300 or more. Does this help?

May 15, 2009 | 2005 Chevrolet Cobalt

1 Answer

Temp gauge shows hot even if engine has been off overnight?


Locate the temperature sending unit and pull the wire off of it. Turn the key to the on position (do not start) then have someone touch that wire to a ground source and the temp gauge should go from one extreme to another (cold to hot). If the gauge does that, you have a bad sending unit...if it does not move, you have a bad gauge or problem with the wiring to the gauge.

All the temp sending unit does is act like a variable resistor depending on the coolant temp...if it is bad, it will give you a false reading.

Mar 28, 2009 | 2003 Mitsubishi Galant

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