Chevy Camaro Z28

What could be wrong if a stock 78 Camaro Z28 350 overheats only over 55 mph?

798081

Top Answer
User Avatar
Wiki User
2015-07-17 17:28:47
2015-07-17 17:28:47

The most probable answer is: Coolant is not flowing through your radiator. Coolant is low/empty, radiator is smashed or clogged, but most likely the thermostat was not installed correctly or has failed. BUT - if any of these were true you would also overheat in stop/go, 30 mph traffic. If you can drive all day at 30mph stop/go and not overheat, look at the next answer.

Another answer: The automatic transmission is slipping in 3rd, creating a lot of heat at highway speeds. If you can see gray or sooty tranny fluid on the dip stick, keep driving it until your clutches burn and get a new 4 speed (200 4R or 700 R4). Don't rebuild the stock 3 spd.

Just FYI, at 55 mph the fan isn't doing anything anyway. And I can't believe it's really "only" at 55 mph. For example, if it started over heating at 55 mph and then you slowed to 25 mph stop and go driving, it would cool down?

fan shroud not installed,thermostat in backwords,air flow blocked.

If your car is an automatic like my 78, the only definite solution I know to this common problem is to trade in your transmission for one with overdrive. You can notice that the car won't overheat at the low rpm's you encounter on most surface streets and then when you get on the freeway, you hit 4000 rpm and almost blow up the engine in the slow lane. Personally, I'm going to take out that automatic and put in a five speed manual. Ultimately the investment should pay for itself with the fuel economy you'll probably get, not to mention that a three speed automatic tranny will almost definitely just burn itself to dust in the modern world anyway.

i had lot of different years if you replace the clutch fan with a streight fan it will over heat at a high rpm due to the blades streighting out

I had a 86 TA, the air dam would drag and came off the car, I didnt think anything of it so at 55 or higher the car would over heat, make sure the air dam is attached that runs along the bottom of the car. air dam under car missing is 100% ypur problem.at higway speeds air goes around radiator,need lower spoiler to divert air to radiator g

1
๐Ÿ™
0
๐Ÿคจ
0
๐Ÿ˜ฎ
0
๐Ÿ˜‚
0

Related Questions

User Avatar

Fan could be broken. Pump could be broken. Could be al leak. Or something else. At least: is serious! Could ruin engine foregood. Get it fixed.

User Avatar

The horsepower of a 1989 camaro Rs is 173 horsepower. WRONG. The number 173 refers to the cubic inches of the 2.8L engine. The rating of that engine is 135 HP stock.

User Avatar

last time i checked it was 19 city 21 highway but i could be wrong

User Avatar

first check to make sure your fan comes on. if it does then there are several things that could be wrong. first do you have enough water/antifreeze in the radiatior. check to make sure you have no leaks. then replace the thermostat located in the top radiator belt housing connected to the motor. if it still overheats try replacing the water pump. if it still overheats after that check your oil to see if theres water in it if there is you blew a head gasket

User Avatar

something wrong with one of the airbag sensors.

User Avatar

I will say you have a crack in your radiator and once up to pressure a seam blows out your water. I would check along the side.

User Avatar

too many things to list could be wrong. take it to a reputable repar shop. Good luck.

User Avatar

Yes, however, the six cyl tach is different from the eight cyl tach. It will work but the RPM display is wrong.

User Avatar

Advantage: Don't have to worry about it being in stock or not. Disadvantage, the color could be different in person, and the size could be wrong, and it could just look bad and then you have nothing o do with it.

User Avatar

The 99-2002 camaro 3.8 V6 doesn't have Idle air control valve. It is drive by wire control. Many of the parts dealers have the wrong data that 95-02 3.8 camaro have the same Idle air control valve location, and sell the wrong part.

User Avatar

I may be wrong but I find it highly unlikely that the Romans ever sold stock.

User Avatar

bad thermostat, engine coolant temperature sensor(ect). not enough coolant. radiator is pluged up try flushing,or replace radiator.

User Avatar

Well, the doors could be sealed and it's full of water like a fish bowl, or it could have been inhabited by bears hibernating for the winter, or bats might be hanging from the undercarriage and causing thumping when you drive, it might even be yellow, or it could be none of these. Did you have a specific problem?

User Avatar

if its cranking but not starting most likely fuel pump

User Avatar

Here are some reasons why stock levels could vary from original records:Inventory miscount.Damaged stock removed but not recorded.Unauthorized stock removal, e.g. sales personnel for samples or theftData entry error, e.g. wrong digit entered.Mis-pick, e.g. employee selected product from wrong location.Returned product not properly accounted for.In accurate delivery quantities against manifest

User Avatar

If the radiator or reservoir cap is bad it could cause overheating because the system will not build up the proper pressure. Also the fan clutch could be worn out which would keep the fan from spinning fast enough to cool the radiator.

User Avatar

might be a bad head gasket or radiator might be clogged or timing might be off you would need a machanic to look at it and diagnose it

User Avatar

Im having the same problem on my 92 V6 Camaro. Someone told me to check all the vaccum lines. That's what I'm gonna try next.


Copyright ยฉ 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.