Response to high running temp. And my problem is my heater core.
I have a 1995 grand am and the temp runs a little higher than normal, it also runs cooler when I turn on the a/c. I took it in to my mechanic to remove the thermastate because, I have had cars before that ran hot or over-heated and removing the thermastate always worked. No more running hot. Anyway, he said that the termastate was already removed. It must of been removed before I bought it. Then he said that it was ok to drive it running at that temp as long as it didn't over heat. Also that if he put a thermastate in, it would most likely run hotter or over-heat a lot, and thats why the previous owner removed it in the first place.
Try running your car without a thermastate and see if it helps.
An on going problem I've been having with my grand am is, the Heater Core keeps going out every 2 to 3 years. Mechanic says it has a factory defect that keeps shorting it out. I bought it in 2000 and it just went out again. This is the 4th time. If anyone has had this problem and knows an answer on how to fix it to last longer, please let me know. It cost btw 300.00 to 500.00 to fix. The labor is a lot. You have to take the whole dash out. Thanx
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Re: Response to high running temp. And my problem is my...
It seem that the root of your problem maybe caused by by radiator the heat exchange maybe restricted by dirty fins or corroded passages with in the radiator. This is proven when your temp goes down when your a/c is on. the airflow increases when the a/c fan is on. also make sure your fan turns on high when engine is hot. The heater core problem maybe caused by the removal of thermostat. the thermostat control the flow of cooling water and by removing it it forces more pressure to the heater core thus causing it to fail prematurely. you really need to fix the high temp problem, removing the thermostat will just contribute to more problem not to mention a slow warm up of the the engine (delayed heater reaction) and may contribute to high emmision discharge. The radiator usually cost around $150.00 + 1 hour of labor a lot cheaper than $300 - $500 bill to replace the heater core.
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Flushing the radiator should actually cause your motor to run cooler, because the flushing process removes built up gunk and rust that plugs them. If you are talkin about getting more warmth to the interior of you pick up through the heater. there are a couple things you can do. replace the engine thermostat with a little bit higher temp. or you can try to backflush the heater core itself. if you are not getting the heat through your heater the best bet is the heater core is pluged, this is very common to have happen. Hope this helped you out. Thanks Aaron
Your heater core could be plugged with dust if this problem came up slowly I would suspect that. Another thing that cold be wrong is a trap door is not opening these are operated by cables vacuum or stepper motors. Confirm that something happens when you move from cold to hot on the control.
Very well could be the heter core. It sits just behind your dash on the passengers side. If you look in the back of the engine agains the firewall you should see two hoses going into the firewall together. The come from your engine block. Run the vehicle and get it up to normal running temp and turn the heat on. Touch both hoses with your hand and see if they are both hot. If one is hot and the other is cold then your core is blocked and you wont get heat. If they are both cold then you have a different issue such as temp sensor or water pump issue.
If the engine is getting hot enough it sounds like the flow through the heater core is restricted. When it is hot turn the heater on and feel the radiator hoses. One should be real hot and the other a little cooler, not much. Try taking the heater hoses off and run water from a garden hose through them. Run both directions and maybe it will break something loose. You won't lose much antifreeze by unhooking the heater hoses.
Sounds like there may be an air pocket in the system. Try 'burping' the system. If this still doesn't fix the problem, check the temperature of the heater core hoses (in and out) The inlet should be fairly cool, the other should be piping hot. If they're both cold; the heater core has an internal blockage.
Next, replace the thermostat with a winter (180-195 F) derivative. Bleed the system accordingly, and keep me posted!
Everything you said is normal. It is common for these to hear coolant in the heater core, especially with a new one. There is a cure for it but it will make the heater not work as well. 200 coolant temp is normal. It is running at 170 with the air on because the fan is running. You can get a thermostat that opens at a cooler temp but the vehicle will run better and get better mileage at 195. Without the air on the fans will come on at 235. I don't see anything wrong.
I think you could be right about there being air trapped in the system. Or the heater core(radiator) is plugged. Either way you need a pressurized radiator coolant pump to put the coolant in without air being trapped. Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in. But this is dangerous to try.
sounds like you may be low on antifreeze. ck and top off as nec. then run vehicle again if was low. if engine is running at normal temp (around 195-200 degrees) and not fluctuating, then a possible restricted heater core is suspect. you can flush these cores out fairly easily at firewall under hood. (do this before replacing core, pressure washer works well). if engine temp is not normal(reads low) or fluctuates, replace thermostat.