Question about 1998 Chevrolet C3500

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No heat coming out?- temperature gauge is reading correctly. Fan blows but no heat?

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  • 78 Answers

Check coolant level-low coolant can cause the problem. Start there. Could also be a mechanical problem with the blend door for the HVAC. Need to scan the Heat A/C system for fault codes so you will need to have a mechanic check that part of it.

Posted on Apr 14, 2014

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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: 2000 Silerado Heater Problem?

your thermostat could faulty.when it stuck open it won't let the engine heat up to the right operating temperature and will be blowing luke warm to cold air out of the vents.have it replaced that should solve your problem

Posted on Nov 17, 2008

  • 356 Answers

SOURCE: temperature gauge is inaccurate and check engine

Have you checked the antifreeze level lately? Low antifreeze will cause a temp sensor to give false readings. Does your heater work OK, as in does it blow hot air when heater is on? that is another symptom of low antifreeze.

As far as the check engine light coming off and on, I would bet it is the oxygen sensor that might need to be replaced.

Posted on Oct 20, 2009

  • 75 Answers

SOURCE: 2000 cavalier heat only works while idling

most likely it's a bad thermostat that is stuck open and the engine doesn't warm up properly - which might explain a bit about the heat issue as no heat builds up in the heater core, this can be done yourself - if I remember right (was over a year ago) it was only $9 at O'Reily/Murray's plus coolant - just be careful with the coolent as it's very toxic and if there's particles or looks very dark do not reuse (if you've not had it done before, it's probably best to just replace it anyway) and you should dispose of the used coolent properly (Do Not just dump it down a drain)

Posted on Feb 10, 2010

  • 4336 Answers

SOURCE: My temperature gauge seems to

Air bubbles would not cause what you describe, the correct thing to do is to measure the temp with an external gauge. The sending unit is the usual cause, and pretty inexpensive to replace it, for diagnostic purposes...It is filled with wax and eventually fails....

Posted on Mar 04, 2011

  • 202 Answers

SOURCE: What could cause my truck to have no heat?

the heater radiator could be blocked or the valve controlling the heater could be faulty ,,,, carefully check the heater hoses ,, they are the small ones running from the engine bay through the bulkhead into the car,,,they both should be hot ,,, if one is cold the water is not circulating either due to a blockage or the heater valve not working ,,, if the car has climate control you need to be sure that it is serviced properly as this system mixes the hot and cold air,, also at 210 you should have some heat , the best way to check if its the thermostat is to run the carstationary until it gets hot even if the thermostat is faulty the system will build up heat due to no cold air passing through the grill and coolng the engine radiator

Posted on Feb 11, 2012

Testimonial: "Ok, so we replaced the thermostat (even though it looked completely functional when we got down to It) since it was only $7. That didn't fix the problem (not a big surprise). So, we then followed your suggestion of checking the temperature of both hoses going to/from the heater core and only the hose carrying water into the heater core is hot, the other remains cold even after running the truck for 10-15 minutes. Temperature gauge appears to be working correctly, with it slowly climbing to right under 210 and then falling/rising consistently between 195-210. All of this leads me to believe that the heater core is blocked or otherwise broken. I do not believe there is anything like a "heater valve" on my truck. Any thoughts aside from replacing the heater core (or does that even sound feasible to you)? Thanks!"

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1 Answer

Where is the heater control valve on a 2000 Lincoln town car?


you don't have one what is wrong ? no heat? no forceful air coming from the fan? cold air blowing heater functioning? temperature gauge reading very low and as you drive it drops to cold? you must tell me what is wrong and I'll be able to take it from there

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3.3v6 94 plymouth chrysler heater not blowing hot but seems but seems heat up when fan turns on but fan not staying on long


I do believe that you have a thermostat problem. If you have a temperature gauge in the dash, I'm guessing that it mostly shows a lower than normal temperature. If the thermostat is working correctly, the engine will maintain a very constant, normal temperature. If your engine temperature is showing normal, and you still are not getting sufficient heat, then you have something else wrong in regards to the heater controls and valves.

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Jan 14, 2012 | 2005 Buick Rendezvous

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2006 chevy silverado 2500hd truck heats up to operating temp while in parking lot blower works well but truck will not blow any hot air until truck is driving at at least 15 to 20 mph. fuses good think...


If I understand you correctly, your temp gauge shows correct operating temperature, your blower fan blows air that you can feel with your hand from the right floor or dash outlet, but that air doesn't feel warm until you are moving?

If so, several possibilities come to mind. One is that your coolant level is low. Even though your temp gauge reads in the right range, the coolant level could be low enough that it doesn't reach the heater core until there is enough engine RPM to create more pressure from the water pump and force what coolant is there toward the heater core. Another possibility is that your heater controls are not able to do their job. A stuck flapper in the duct or a malfunction with the temperature control system could be causing the problem, and at 15-20 MPH there is enough air coming through the outside air vents to provide some heat.

I'd check the coolant level first, though. The other possibilities are more far-fetched.

Nov 26, 2010 | 2006 Chevrolet Silverado

1 Answer

My 2003 hyundai accent is over heating I replaced the thermostat the belts are fine Im not sure what else it could be


If it only overheats while stopped or when driving slowly then check to see if your radiator fan is coming on. If not check the radiator fan fuse, temperature switch, relay, and the fan motor itself.

If it is consuming radiator coolant or is blowing steam out of the tailpipe then consider a blown head gasket as your problem. The engine oil may or may not look milky in color if the head gasket is leaking.

did you install the thermostat pointing in the correct direction? Is the radiator cap in good shape? Check for correct coolant level. The radiator will continue to draw in coolant from the reservior for many heat cool cycles after it has been opened.

And lastly could the temp gauge be reading high? Possible temperature sensor.

Sep 03, 2010 | 2003 Hyundai Accent

1 Answer

Coolant system


The car overheats because the fan system is not working. The engine coolant sensor tells the computer to turn on the fan when it gets hot and also sends temperature readings through the computer to the heat gauge. Try turning the AC on if you have it--it should immediately start the cooling fan. If nothing, check the fan fuse and relay. It's also possible that the fan motor is frozen due to bad bearings. Try replacing the coolant temperature sensor to see if that restores the gauge readings. Hope some of this helps!

Jul 02, 2010 | 2000 Saturn SL

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My temperature gauge stopped working and the cooling fan now stays on.


It sounds like your coolant temperature sensor has gone bad. That would explain why your gauge isn't reading correctly and also why the fan stays on constantly since the signal coming from the sensor is not correct. Let me know if you have any further questions. Thanks for using FixYa!

May 15, 2010 | 2005 Chevrolet Uplander

1 Answer

2003 Town & Country - no heat or gauge movement


If the coolant level (antifreeze) level is low there may not be enough fluid in the system for the temperature sensor to register a proper reading ( think of it as holding an oral thermometer just outside of your mouth).

Insufficient fluid passing through the heater core (small fan that blows through a small heated radiator) may not be enough to produce heat.

However: At increased speeds the engine may be heating what little fluid there is to a point to supply heat to the heater core, and register on the temperature sensor.

Feb 28, 2010 | 2005 Chrysler Town & Country

1 Answer

Heating problem


Yes that is cool if it's correct. 195 F is approx.as low as you should have. I'd change it. Be sure to run with cap off, and heater on (not defrost) while refilling system. Wait for rad fan to come on 2 or 3 times before you put cap back on, then add coolant to return bottle as needed. Make sure rad fan only comes on when up to normal running temperature. If it runs all the time, it may be causing low coolant temperature too.

Jan 25, 2009 | 2004 Pontiac Montana

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