After a new thermostat and a new heater core in my 94' Z-71 my temperature gauge is still "under" where it should be. Also, I have no heat inside my truck when I turn on my heater full blast. Please help.
2006-10-29 07:32:13 · 16 answers · asked by j d 2 in Cars & Transportation ➔ Car Makes ➔ Chevrolet
Thermostat is stuck open.
2006-11-02 04:34:14 · answer #1 · answered by FRANCESCO N 2 · 0⤊ 0⤋
heater control valve closed no vacuum or just bad, vacuum leak, thermostat defective, or stuck open or missing, restriction in heater lines, vacuum programmer in the automatic controls is defective, and or all the above what ever you did was not what was wrong with it in the first place , start over step by step and make sure no mistakes, if the thermostat was installed in correctly or up side down it would over heat OK, so kink line means restriction as well, i have read all your answers and well I can only one or two know something about colling systems but not much this is why you take to a really good mechanic these people are clueless this is why I made so much money on cooling systems they have failed the simplest test you are running cool so there is no way its a plugged thermostat, your not over heating !, the only thing working is the fan so work back wards ,controls, then firewall vacuum lines to the heater control valve when motor running use your hand safely and touch the hoses and see where the restriction is if on is hot the and one is cold then you did not take the plug out of the new core, if both are hot then its in the car the automatic controls, the leavers, its vacuum on other side of em, , are the radiator hoses warm ? its realy simple, good luck
2006-10-30 10:53:41 · answer #2 · answered by Mechanical 6 · 0⤊ 0⤋
Most likely answer is the thermostat was incorrectly installed. Second possibility is that thermostat is defective. Test the first two by taking the thermostat out (note position it was installed), and heating in a sauce pan to observe if it opens. If it opens, note which direction it opened, and make sure that it was installed properly direction-wise (usually the heat sensing part installs down toward the engine so that heat from the engine block coolant heats the bottom of the thermostat and causes it to open). . Third possibility is that the heater controls are in-op, i.e., frozen in the off position, or that there is a complete blockage or clog somewhere in the heater loop, like in the intake manifold connection..
2006-10-29 15:52:03 · answer #3 · answered by DR. C 3 · 1⤊ 0⤋
If you are a bit handy try this: First you should remove your thermostat, boil a full kettle of water and get a piece of coat hanger wire, hook your thermostat to the coat hanger wire and lower it down into the boiling hot water so as to not burn yourself. Check to see if the thermostst opens, remove it from the water and then see if it closes properly. If this works your thermostat is not the problem. The only other thing I can think of is to make sure you installed the proper thermostat for your engine. Hope this helps!! It's also possible that there may be air in your heater hose. So if you take one of your heater hoses off to check if you have antifreeze running through it. This also can cause you to have no heat in your truck! Another possibility is that there is an air lock in your heater core. By opening the highest hose the air will be let out. All this comes from the advice of a 20 year mechanic. Best of luck to you.
2006-10-29 15:48:43 · answer #4 · answered by 7894 2 · 3⤊ 0⤋
You may have installed the thermostat upside down. The big spring on the thermostat faces toward the engine.
You may also have air caught in the cooling system but that usually causes it to over heat not over cool.
2006-11-01 18:50:01 · answer #5 · answered by whtsthislif4 5 · 0⤊ 0⤋
This is a first over-cooling. I was thinking it sounded like a plugged heater core or a bad thermostat. However you have replaced both of those you could have a pinched hose or a plugged one. You may have installed the wrong size thermostat.
2006-10-29 17:31:48 · answer #6 · answered by READER 1 5 · 0⤊ 2⤋
Your heating loop may have rusted through or become clogged. Can you smell coolant in the cab? If so it is a bad loop. Also might be a bad thermostat, ot thermostat was not properly installed.
2006-10-29 15:35:31 · answer #7 · answered by Jim P 4 · 0⤊ 1⤋
Sounds like a bad thermostat. if thats the case you should replace it. there is one out there called a fail safe thermostat. its designed so that if it does go bad it will stick in the open position so your engine still gets coolant. i wish i could remember where i bought it from. its been a few years since i replaced mine.
2006-10-30 01:53:13 · answer #8 · answered by www_andrew 2 · 0⤊ 1⤋
My guess is that you didn't mix your antifreeze with water (50/50 ratio) correctly. If you have too much coolant it will cause the engine to run cooler and cause a rich/lean situation with your fuel system. If you grabed one of the propolyene glycol coolants like Engine Ice or Water Wetter it will run too cool for the street. I would flush the system using a tradition ethelyne glycol coolant. If I were you I would buy it 50/50 pre-mix (they use de-ionized water that won't scale). You could also go with a Global Hybrid Organic Acid Technology Coolant but you won't see the extended life capabilities that it advertises. Your car was not meant to "extend the drain interval" for coolant. Also check your radiator cap and make sure that you have not over-filled the resevoir.
2006-10-29 18:06:04 · answer #9 · answered by Todd 1 · 0⤊ 2⤋
Make sure you're not low on coolant. If the sensor is exposed to air it will read low. Otherwise, a wrong or leaking thermostat.
2006-10-29 17:37:15 · answer #10 · answered by Nomadd 7 · 1⤊ 0⤋