Question about 1998 Chevrolet C3500
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
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
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
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
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
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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