Other than the thermostat, what could be wrong with my truck that would cause no heat to come out of the air vents? Temperature knob has been set at varying settings from medium to high, but no heat ever comes out. It blows cold air only. Engine temperature gauge stays consistently under 210.
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
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!"
when car is cold you could try disconnecting the heater hoses and running water through it using a garden hose but be careful you dont overdo the pressure because you could burst the heater rad if you over do it this might dislodge any blockage ...hope this helps
did ya try that ,,,, let me know and i will do my best ,,,, funny but i might be from ireland but i am a mechanic with 29 years and i hate to have people give stupid advice and lead you wrong... always start easy and spend money later ,,,,, if water is hot going in and not coming out its a valve or blockage ,,, think about it ,,,, most newer cars dont have a valve but some do ,,, other than that its a blocked rad ,,,,
and as im here watching for water circulating with a rad cap off dont work unless thermostat is open fully ,,,,, how can water swirl around with the thermo closed ,,, basically its another valve that dont open till water is really hot ,,,and if it aint open water isnt going to circulate so you would notice through the rad cap ,,,, and as i said 210 is plenty hot to get heat ,,,, if pump was faulty both hoses would be cold ,,, jesus!!!!!!
and william is right only i say blocked or valve ,,, dont make me come over !!!!!!!!!!!!!!!
jeremiah/william - The next plan is to try and gently backflush the heater core. Wish me luck. I'll post back how that goes later this week. Thanks!
how ya get on ,,,,, let me know latest results
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It could be a bad heater core
SOURCE: 1995 Chevy Tahoe 5.7L V8: thermostat temperature/running temp?
Depends on what thermostat you put in. Stock is a 190*. Which will usally run about 200-210. That's where most all small blocks are happy.
SOURCE: temperature gauge not working 2005 chevrolet impala
There is a temperature sensor likely to be on your radiator. Make sure the connection is plugged in. Sometimes un-plugging and plugging it back will correct the issue. If not, you'll have to have some check if the sensor is faultly or if the electric wire is fault. You can check your fuse box. I don't think it's a fuse because other things on your instrument cluster would also not work.
SOURCE: Problem with No Heat on 2005 Chevy Avalanche - Cooling System?
It sounds like a water pump to me. Check the pump for leaks. then tak off the radiator cap. Start it up and watch, to see if the water circulates. (ONLY TAKE THE CAP OFF WHEN ENGINE IS COOL)
SOURCE: temperature gauge not working 93 chevy 3500 5.7
What engine? 350? It is in the drivers side head. Between the 1 and 3 spark plugs.
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Changing the thermostat is the current plan. I don't have a radiator cap per se, just a cap on the reservoir. Here are the specs of the truck:
V6 - 4.3L vin W 262ci - MFI GAS OHV
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