Car Overheats at High Speed Only

Radiator thermostat rad cap The car has 422000km so a headgasket or waterpump has ruled it to be laid to rest. I replaced the pump and it ran fine for.

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The most common reason why a car overheats when AC is on is the AC multifunctioning compressor overload.

. When you turn the air conditioner on the compressor needs to work with the engine and the compressor moves the refrigerant cylinders to compress which creates great pressure on the engine. Truck overheats at highway speed but not in town. Db4690 June 2 2018 332am 10.

If it always overheats quickly after startup less than fifteen minutes it may be that your thermostat is not opening properly. One does NOT sit until ac comes on. If it doesnt work then replace it.

Its worse when the weather is colder. This one is a little more complex because it could be any number of things. If they are pushing air OUT through the radiator against the direction of travel itll stay cool when stopped or at low speeds then overheat when at speed basically creating a dead air space within the radiator fins.

A plugged radiator will allow the engine to operate normally in town and on surface streets but when driving at highway speeds with the engine running at a higher speed all the time then the radiator cannot cycle the fluid fast enough and causes the engine to overheat. If the fuse is blown then replace it. This one might make ya feel dumb but double check the rotation of the e-fans.

This is a discussion on Car overheats at highway speed only. If the radiator had a partial blockage traveling at speed would offer more air flow to compensate. If that isnt it then some troubleshooting can help you find the cause.

What causes the car to overheat while driving and how do you stop your car from overheating. Civic 2005 eagle eye is overheating when ac is on and speed is over 100 at high speeds the engine generates more heat hence requires more coolant flow through the radiator and if theres blockage in radiator or coolant flow engine heats up at high speeds. If it does not turn on within a few minutes then you might have a.

Answer 1 of 3. At high speeds under pressure the temp rises above 90 keeps on rising until slowing down then temp remains at 90 unless speeding up again. Pressure testing the cooling system and the cap is where to start on overheats at high speeds presuming a visual inspection shows nothing obvious and the engine timing and fuel trims are ok.

If the fan is switching on then you need to have the water pump checked to see if in fact it is pumping coolant this could also be the cause of overheating at highway speed If you are overheating only at highway speed you may want to have the enigine checked for a blown head-gasket or faulty radiator. At least on US spec models. Start the car and allow it to come up to temperature.

Low coolant is the most common cause and easy to fix. Most the time when idle the heater goes cool until driving off. If it overheats mostly at high speed it is most likely that the radiator is partially plugged and needs to be backflushed rodded or replaced.

If your car is overheating while driving at highway speeds youve got a different kind of overheating problem. Up to 8 cash back The radiator is plugged up on your vehicle. Trying to explore all options and advice before doing so.

Both fans work together both on low and both on high when it goes there. By a large margin the most common cause for engine overheating is simply a low coolant level. Get the radiator serviced and check thermostat valve.

It was a bad seal on the water pump. Here when that second fan does not come on sometimes you overheat. What happens is as hoses get old they weaken and can collapse under higher engine speeds.

Started having this problem where I would take my ride on the highway and after about driving a few minutes. Ask Question Asked 3 years 3 months ago. Check your reference material on how to test the relay.

At high speed it leaked behind the fan and atomized the water so there was no sign of a leak except the radiator was low. Minutes of 2700-3000rpm in fifth gear 115kmh car has overheated and most coolant is lost when pressure is relieved. Heater blows cold Already replaced.

Your engines cooling system relies on coolant to circulate and remove heat from the engine. Car overheats only on highway. Ive seen a several causes for this.

As soon as the engine speed decreases the hose goes to normal and cooling resumes. Within the External Engine forums part of the LSx Technical Help Section category. It turns off after I slow down to about 60 and wont turn on again unless I get back to 80.

The trick of sticking washers under the coolant temp is used by crap car dealers to make you think engine not overheating on used cars. I get the red overheating signal at high end speeds of 80mph. If it is then you have a dead short in the fan motor or in the electrical system.

The coolant has depleted slowly and Ive topped it off every couple weeks. Recheck the fuse to see if its blown again. Ive been having fits trying to get this thing to stop overheating.

Warm it up open the hood and watch the fan. Car overheats at highway speed only. Over heating at speed with high air flow Operates normal when stuck in stop and go traffic it runs perfectly cool with low air flow.

It would run all day at 55 mph but would overheat quickly at 60. If you dont have enough coolant in there to do the job heat will build up and your engine will overheat. Has all the tells of a circulation issue.

Check the fan fuse or relay. I can drive around town up to 40 mph all day long in temps up to 90 so far and the needle hovers just left of the center line I think its either an 85 or 79 dash not sure. Why does my Car only Overheat when I Accelerate Quickly or Drive Hard.

The water pump has enough of a draw on the fluids it can collapse the weak hose causing a lack of fluid flow through the engine and thus overheating. Considering OP had 290000 miles on a 1997 Mazda Protege back in 2007. At highway speed you have a fifty or sixty mile per hour wind moving through the radiator so air movement is typically not the problem.

If the car overheats while travelling at highway speed it is typically caused by reduced coolant flow. The potential causes of a car overheating at highway speeds are a stuck thermostat a restricted radiator or a kinked hose. Switch to an all-aluminum multi-core racing radiator from a quality maker and if you live in a warmer climate go to a 7030 mix of EG and distilled water.

Assuming everything is in working order this typically is because you have an undersized radiator for your application.

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