What else could it be? SATURNTECH9 MEMBER; With just the heater core clogged up I couldnt see that making it overheat. no the heater core gives the coolant more time to cool in fact try turning on the heater next time it starts over heating and see if the temp drops. Even if you have an older vehicle with the heater core outside the cabin, leaking fluid can still find its way into the cabin through the ventilation ducts. Saturday, December 17th, 2011 AT 2:22 AM. Your van hasn't been vandalized or sabotaged... has it? You can sign in to vote the answer. The heater core should help it run cooler. Take it to a real shop not an all in one place like pep boys or a quick lube. Have an answer or just a good tip? Which is the better motor for a 1970 ford galaxie 500? will pay fair price or In An Automotive Engine, The Wrist Pin Connects A. the connecting rod to the crankshaft. Use an external temp sensor to double check. As has been said, check the fans. He just simply has no heat. The poor 351M probably was wasting 30% power trying to pump exhaust gasses through the mostly clogged muffler... yes, I opened it up to look. A heater core often goes bad due to leaking. In fact, this makes great emergency cooling. My coolant levels are topped off and I replaced the thermostat (was my first guess). Will this cause overheating? Bypassing the heater core will make it run hotter (theoretically) than leaving it connected to the system. Now we come to one of the most noticeable bad heater core symptoms. You know that there's no head gasket problem, that's good. If the heater core is plugged, coolant flow restricts. My fiance's heater core is out in his car and this doesn't happen to him. Sometimes an engine that has been overheated will have a warped head, and of course if the head is not machined and the gasket is just replaced, a head gasket job can fail. Ok so I read over everyone's advice and suggestions. I think it is very unlikely that the problem with overheating is due in any way to the heater core. Even if the core is plugged up, it shouldn't make it overheat, the coolant doesn't all go through it anyway. Is changing something like this an "easy fix" for someone with little experience with car repair? 95 Ford Ranger will not stay in "Park" slides into "Neutral". You're not losing any coolant... right? Ever wondered where the warm air comes from? If it's an emergency, bypass the heater core with a hose and clamps to route coolant back to engine. I'm by no means an expert on cars but I think that it is either a bad water pump , air in the cooling system or a bad temp sensor, id like to rule out the last two because, they seem to be something that i would be able to do myself. Also what about coolant in automatic transmission? Can also just turn the A/C on. What could be causing this issue? Bypassing the heater core usualy invovles connecting the two (inlet and outlet) hoses that go to the heater core together. Although not as common, it’s also possible for a heater core to become obstructed enough to restrict coolant flow and cause overheating. As in, driving up a slight incline is about that same as the compressor being on. If the heater hoses leak enough, the coolant loss will compromise the effectiveness of the cooling system and cause the vehicle to overheat. I don't think so. Join Yahoo Answers and get 100 points today. It's a 1989 Ford E 150 (Club Wagon) 5.0... Overheating consistently, either in idle or driving. SPONSORED LINKS. If that isn't the issue I've found the temp sensor at a local Auto parts store. What do I mean? If none of that resolved the issue I would also get the AC checked to ensure no faults in it are causing this. Can a Bad Heater Core Cause Overheating? I once worked on a fully loaded 1979 Thunderbird Heritage Edition that had a rusted out exhaust system... and it had the same problem. Heater blows hot air. Related Questions. Low coolant will cause an engine to run at a higher temperature, which can result in extensive engine damage. Got a juicy car meme? Well, it comes from the heater core behind the dashboard. Is Ford a good car brand for an investment? Yeah, 1989 is hardly modern as cars go.. but better safe than sorry. The car ran fine for a couple days without it overheating. Sure, it contributes but in such a minor way it's not even worth talking about. If not, do so and check for gunk in the oil or an obstruction at the drain hole. No cracked head, no coolant in oil, no blown head gasket. Really. These problems can really test your patience... but it has to be something somewhere. Heater core is not leaking visibly, no loss of coolant other than overflow runoff from slight overheating. That's not why AC heat loads a cooling system. Some waterpumps rotate clock-wise, others counter clock-wise. If you have a bad heater core, you should bring your car in for repairs right away. By rggroup on April 10th, 2019 in General. Replaced: water pump, all connected hoses and clamps, thermostat, temperature sensor, radiator cap, radiator has been pressure tested and cleaned TWICE, fan is working normally. Click to see full answer This can cause the water to overheat. No Prius Podcasts. Please share as part of the Cartalk community. If your van has an automatic trans, that could be the source of the trouble. There's something wrong inside the engine... the block itself has an obstruction. Replace the pressure release cap. Don't do that, leave it in. answer. Unclogging a heater core is often a matter of having access to the correct how-to-do-it information and the right tools at your disposal. It was like dropping 1000 lbs off the trunk. Fan won't matter about 35 mph, and the heater core actually acts like a mini radiator and would actually help in cooling off the engine. Would that work (assuming I don't care if the heater works at this point). Often, it's something stupid that causes problems so be sure. If the obstruction is great enough... your exhaust manifolds can get so hot, they'll glow bright red in the dark. On most new vehicles, the heater core is inside the cabin of the vehicle. Yes. 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Again I am very grateful for your time and help.Thank you. Overheating, some power loss. Also have you checked your upper & lower radiator hose temps after a normal run? Having coolant leaking into the cabin of your vehicle can cause all sorts of problems. Make sure it's OK... if you have one installed. It's possible that turning the AC on is activitating the AC compressor and putting that little bit of extra load on the motor that is pushing it over the top. Car Overheating Repair Cost. Odds are the heater core was leaking and bypassed unless they had an issue with the auto controls and couldn't turn the heat off. I removed the muffler and whammo! Disconnect the lines going to and from the heater core, start the engine and the reasons for a bypass tube become immediately obvious. Might not be the most comfortable drive, but it will save you cooking motor. Even a clogged heater core can prevent proper coolant circulation, causing your engine to run hot. Have the fan clutch tested. If the thermostat doesn't open +/- 10 degrees of what it's supposed to... replace it until one tests out OK. Use the stock rated T-stat too! No. Does it overheat at driving speed, or while idling? Press question mark to learn the rest of the keyboard shortcuts. The heat exchanger inside your car that keeps you warm on cold days can cause your engine to overheat. Ensure no air locks in the cooling system. Following your vehicle manufacturer’s preventive maintenance schedule will … We love those things. The difference between the primary radiator and the heater core is that air going through the primary radiator comes in through the front grille and exits into the engine bay, while air passing through the core comes in through intake ducts in the cab and comes out the vents. Diagnostics not reporting any error codes. If the heater core is clogged can this cause the car to over heat Do you. have the same problem? What I noticed after bypassing the heater core is that the pressure increased noticeable in the cooling system and it will get rid of the coolant in the expansion tank if it is left above the minimum line so for now I keep the coolant level at the minimum other than that no problem. Get your answers by asking now. You can still have pressure even if your radiator is slightly plugged up. It's a 1990 Cadillac DeVille. It is a small radiator that is cut off from the system when the heater is turned off. Installing them onto an engine that spins them backwards (according to the direction they're supposed to be spinning) screws up any pumping action. Plugged heater core. They are $5, degrade over time and no one ever seems to replace the damn things.. No, it will not help. If the overheating isn’t caused by a bad heater core, you can read this article about the most common reasons for an overheating car. Are you only going on what the guage on the dash tells you? It is already hotter outside when you need to use A/C, on top of that the A/C condenser is dumping extra heat in the air in front of the radiator. Now its overheating when i have the AC turned on. Don't do that, leave it in. Replacing a heater core should be done by a pro. With a gas-fired heater, the base of the heater can become covered in a thick layer of sediment and sludge, which makes it harder to heat the water to the correct level. Clogged heater core can create a problem for an automobile's heating system. Tankless heaters that don't have a reservoir are still at risk from mineral build-up. It will be ok, you just won't have heat. Let the car get hot and idle for awhile, if the fan doesn't turn on by the time the needle starts to move past 'Normal', then you have a bad fan, relay, or tempurature sender (a different sensor than the thermostat in many cars). Tags: Bypassing, Core, Heater, Overheating. Find out what by pulling the pan. A fan clutch if one is installed... make sure it works. Also running out of coolant and engine overheating will cause damage. This is an easy check to make. The heat load comes from the condenser as part of the refrigeration cycle. If there was a problem with a clutch, you'd know it. How do you think about the answers? Best wishes! If it starts overheating, open your windows as much as you can and crank up the heater. ? If the flow is insufficient, and it doesn't take much to restrict it slightly, the thermostat won't open and you get overheating issues. When you start your car engine and it begins to warm up, you will notice warm air flowing in and circulating in the car. Fan is plugged in and activates once heated up. Don't do that, leave it in. when the AC is on it gets hot at driving speed. it gets hot at Idle speed as well. Have you changed the oil recently? Yes. Can an automatic trans really overheat an engine?? What else? Check heat and coolant are flowing through the main feed and return pipes after the thermostat opens (it would be interesting to check if the heater bypass gets warm too). If you were careful to shut the engine off as soon as you noticed the warning light, you may have minimized the damage. Yahoo 7 Answers Sign in Sign in Mail ⚙ Help Driving with a faulty heater core can be risky, as it can lead to overheating and extensive engine damage. That will turn on the fan as well. As the heater core uses engine coolant to generate heat, a leaking heater core will reduce the amount of coolant in the cooling system. It can prevent the heater from blowing out warm air. A manual trans won't be able to cause the same problem, they don't really generate any heat. Unless there is a leak in your heater core bypassing it will not take care of an overheat problem. IF you find dirt in the oil or an obstruction... something's up. A bypassed heater core will not cause a car to overheat. How? Now its overheating when i have the AC turned on. overheating. If you have some power loss, check the exhaust system for obstructions. Heater cores can easily rust from the inside out, and you can rig a heater bypass to resolve this problem quickly until you can locate a new heater core. If the fans are working, then you're probably looking at a radiator that is gunked up and just isn't as efficient at shedding heat as it used to be. Be sure you have the right pump installed and double check it in case a parts counter person has their head up their buns. They will point you in the right direction. It shares a cooling tube with auto transmission. A leaking heater core usually will cause a much more annoying leak. Heater core bypass hoses that have leaks; Heater core bypass hoses that are worn ; If your car is overheating and/or your heater is not working, it should be inspected and diagnosed as soon as possible to avoid causing damage to the engine and the inconvenience of operating the car under this condition. Gotta ask... how do you know the engine is overheating? Engine is practically silent at idle. Having an extra passenger would likely produce more heat on an average drive. I mean nothing blocking the airflow from the grille side of the van. Still have questions? Heater Core REPAIR: 5 Signs Your Car Heater Core is Leaking. Why? What else? Engine Overheating. The car ran fine for a couple days without it overheating. Before we get into the causes of vehicle overheating, let’s help minimize the potential damage to your car NOW until you can get it into a shop: 1- Turn off the AC immediately. It is this flow that opens and keeps open the thermostat. 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