1985 cadillac fleetwood V8 4.1 blows cold air out but no heat
Brand new radiator and thermostat, gaskets etc. had everything working fine and drove more than 800km but one hose was worn and coolant leak from worn hose caused coolant to leak out and engine overheat while driving home. I replaced the hose and coolant, engine runs ok and return line heats up and overflow is functioning ok but still blows cold air inside the car. What should I check next? Thermostat, heater core? Not sure what to do next.
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Re: 1985 cadillac fleetwood V8 4.1 blows cold air out but...
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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Make sure that the thermostat is working properly. It is a good idea to change the thermostat when you change a radiator. How long does it take to overheat? You can leave the radiator cap off, start the car and wait for it to heat up and see if the fluid is pushed into the radiator. If not and the car overheats then you know that the thermostat is bad.
Its possible you've installed the thermostat upside down. If this is not the case, then I think you've got an air bubble in your cooling system. It could work itself out or while the engine is cooled down, you can open the radiator cap and see if its at all low on coolant.
I would say that the replacement radiator has blocked cores and is restricting the flow at rpms. Even with a new core the top hose will be hot and the bottom will be quite warm to the touch as there is never 100% transfer of heat during the length of the cores. When a radiator is left for a period of time Assuming it was out of the vehicle the cores block up when the mud in the radiator dries out It has always been good practice to remove the radiator and keep it full of water if you want to use it in the future. So the answer to this problem is a new (brand new) radiator.
Could be a thermostat problem, or potentially a blown head gasket.
if you take the oil cap off and check under neath the cap (inside of cap) if there is sludge buildup i would get the gasket checked.
Also try check in the radiator, if it looks like there is gunk or **** in the radiator it may be just enough to block the thermostat sensor. Usually if its a thermostat problem the temperature dial doesnt move.
Firstly would check for head gasket, thermostat and note how fast it heats up, when does it overheat (on idle, driving on highway, driving round town, etc)
check the thermostat, it may be stuck closed. if it is stuck, the coolant circulation by passes the thermostat through the by pass hose. and does not go through engine. this is why it does not get warm.
Thermostat improperly installed. (backwards) Or possibly you could have a blown head gasket and a bad thermostat at the same time. The head gasket could be letting exhaust gasses into the cooling system. A bad (stuck open) thermostat could "mask" this problem by allowing the coolant to circulate through the radiator when it is not supposed to. Thus, installing a new thermostat would trap the exhaust gasses in the cylinder head and cause the overheating.
I am guessing you have not changed your thermostat from a summer one to a winter one. If this is the case you need to put a 195 degree thermostat in to replace the 165 degree summer one. Let me know. Thanks.
You might have a head gasket blowed or a crack head. Look at your coolant holding tank idling if it is bubbling you got a head or head gasket leaking. If this is happening you should be losing coolant and white smoke out the exhaust. to find the cylinder that is burning coolant pull the spark plugs the one that looks new is the cylinder that is burning coolant Good Luck