I have replaced the radiator, fan clutch, water pump and done a cooling system flush. The hoses both seem fine. During the cooler months, it runs well in the 1/4-1/3 normal range, but during the 80's and 90's temps, it heats up to the high normal range. This is worse with city driving. I recently asked this question and was given several tips. So, I replaced the radiator cap and took out the 180 degree thermostat. I ran it today with no thermostat in a 50:50 coolant mix and it still got upto about 2/3-3/4 when I had the A/C on. I am wondering about the fan clutch now. It is fairly stiff when cold and gives a good burst of air on accel, but what is the point of having a clutch in the first place? Why not have a direct drive fan like the older vehicles? I think mine might not be pulling enough air for the temperature outside and the workload. What else could be causing an overheat like this? Somebody said old trans fluid? I have the timing at 4 BTDC instead of the recommed 8 BTDC now.
2007-06-29 18:26:16 · 9 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
Running without a thermostat is bad, it lets the coolant flow too fast through the engine and radiator and not give it enough time to pull out the heat. Put the thermostat back in. I would use the factory 195 deg. one as this will give you the best fuel economy. Using the 180deg one may be like running without one, it could be fully open and allowing the coolant to flow too fast. The fan clutch is designed to disengage at higher engine rpms and save gas. Thermal fan clutches will engage based on the air temp coming through the radiator (if the coolant is moving too fast and you have a thermal clutch, you will not generate enough hot air out of the radiator to engage the fan properly). Don E stated the ignition timing being off can cause temp problems and he's correct but he's backwards. 4 deg. BTDC is running the ignition timing retarded (essentially moving the burn into the exhaust manifold). If you're trying to get a little more power from the engine, I would try running at 10 deg BTDC. BUT I would set it to the factory 8 deg. first until you clear up this overheat issue. A plugged catalytic converter or exhaust system can also increase engine temps. If it's the factory cat and you are over 100k miles it may be due for a replacement but I would have a mechanic or the dealership check it out first.
2007-06-30 03:25:34 · answer #1 · answered by Anonymous · 0⤊ 0⤋
You may have a leaking head gasket that's allowing combustion gasses to enter the cooling jacket and forcing water out of it into the overflow tank and therefore reducing the effective amount of coolant in the system.
First, put the thermostat back in. It's designed to have one.
Secondly, refill the cooling system and start the car.
Alow it to idle for a few minutes to build to operating pressure in the cooling system. +\- 14psi.
Now, watch the overflow tank for air bubbles coming up into it from the radiator.
You should NOT see any bubbles.
If you do, you probably have a leaking head gasket, or cracked head.
2007-06-29 19:34:23 · answer #2 · answered by Mr. KnowItAll 7 · 0⤊ 0⤋
Taking off your termostat is wrong because its purpose is to regulate the working temp of your engine w/o it can damage your engine in the long run, test termostat if still working put it in boiling water, if not working replace with a new one. Does your car have a auxillary fan for the a/c? if not I suggest you put one to help the radiator fan and about the clucth fan your rigth you can have it fixed to have a continous and much faster run.
2007-06-29 18:39:30 · answer #3 · answered by Jobo 2 · 0⤊ 0⤋
Make sure your radiator is good take to shop and have a radiator flosh so thrtes no restrictions ir do it yourself with Hose if it is fine then u have a head gaket issue I have this exact problem with my brothet current car and this what did Did same thing urs is doing
2016-03-19 05:02:03 · answer #4 · answered by Ellen 3 · 0⤊ 0⤋
It is possible that your vacuum advance diaphram is not working plus you have the distributor 4 degrees to far advanced.This will cause over heating especially at higher engine speeds.It is best to go with manufactures settings.Make sure you have NO vacuum leaks.
2007-06-29 19:42:18 · answer #5 · answered by (A) 7 · 0⤊ 0⤋
sounds like your fan clutch is bad,i would start there and if that doesnt cure the problem i would point my finger to a head gasket leak,or possibley a plugged heater core does your coolant circulate good?
2007-06-29 19:50:09 · answer #6 · answered by Adam M 2 · 0⤊ 0⤋
22r Radiator
2016-10-13 10:31:01 · answer #7 · answered by ? 4 · 0⤊ 0⤋
Great point, I'd like to know more as well
2016-07-29 08:47:39 · answer #8 · answered by ? 3 · 0⤊ 0⤋
Thankyou for the answers, much appreciated
2016-08-24 07:17:57 · answer #9 · answered by Anonymous · 0⤊ 0⤋