Question about 1999 Chevrolet Silverado 1500

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No heat !!! just blows cold air. I think it might be the thermostat. Where is that located on a 1999 Silverado? It is the small V8

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The problem is most likely the control panel. it is very common that they go out and very easy to replace. just pop off the face plate that surrounds your heater controls. then pop out the heater controls. no tools are required. take that to a dealer and get a new one.

Posted on Oct 22, 2008

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Could be the heater core valve, check the cable that opens and closes the water valve to the heater core.

check also the setting of the temperature level. it could still be set to cold.

wait for a few minutes for the water to heat up on the radiator. you could have tested it after you start the car and the engine is still cold.

tnx 4 using fixya,

drcool

Posted on Oct 08, 2008

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2 Answers

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

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I have a 1999 Chevy Silverado with a 4.8 V8 Engine. The AC only blows out hot air. I have checked and the compressor is coming on and the lines are getting cold but there is only hot air coming out of the...


A blend door problem . Mine has it also. Not a repair for the faint of heart. Get someone that has been there and done that to fix it. (Dash will be coming out)
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Heater core could be pluged up, try flushing it out, it could have sedament build up restricting flow into heater core. Also make sure its full of coolant.

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Had the same problem with my Mazda6 awhile back. Took it to the dealer and they found the radiator wasn't holding pressure. They replaced the whole radiator under warranty (WHEW!). Not sure how to check for that kind of thing, but it's a start.

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1985 cadillac fleetwood V8 4.1 blows cold air out but no heat


if you had heat before the problem than there is probably air still in the system . dont know your motor set-up , but it might have a bleed valve on the thermostat housing or a bypass line . if not , start the car and let it warm up ......in the mean time take the upper radiator hose off @ the radiator . When it heats up to normal temp , the coolant should flow out of the hose . that will tell you that the thermostat is opening , and it will also get the air out of the system @ the same time . As soon as it starts to flow , hook the hose back up and tighten . refill the cooling system back to the full line , than check for heat
GM is bad about getting air trapped in the system .

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