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If the fan turns on, you have an issue in the PCM and it may be time for a rebuild. Primary cooling fan is an the driver side. The PCM controls the ground path for the three cooling fan relays. Remove the air bleeder screws located at the water pump and throttle body and make sure the passage is not stopped up. Both fans at high speed. If your project involves a C4 Corvette restoration with all new parts, you can be assured that when you install parts purchased from Modern Gen Auto, you are installing parts that are nearly identical to the original C4 Corvette specifications. If the high speed fans were turned "ON, " by the ECT, the PCM will switch the fans back to low speed when the temperature drops about 3°C (5°F). He states that it doesn't go anywhere. Here are some causes of overheating: * Bad Thermostat or clogged t-stat. C4 corvette cooling system diagram parts. With the valve completely submerged and coolant agitated thoroughly, the valve should close completely. AUTOWIZ posted this bit of info, youll need. "
The engine was trashed and everything was burnt up. Tell-take signs of grayish white or rusty color, or dye stains from anti-freeze at joints in cooling system are almost always sure signs of small leaks even though there appears to be no damage. The result is an engine that is far less sensitive to it's own temperature as far as horsepower is concerned. Replace radiator cap. Air in the cooling system. The cooling fans are controlled by the PCM based on inputs from the A/C system, Engine Coolant Temperature (ECT) sensor and Vehicle Speed Sensor (VSS). After approximately 10 minutes and the coolant in the filling funnel is hot shut the engine off, remove the filling funnel and install the radiator cap. Draining and Filling the Cooling System.
Keep in mind a great deal of the heat in a radiator is generated by the transmission fluid cooling, requirement on auto trans cars so adding a large AUXILIARY trans cooler helps a great deal, if you add an engine OIL COOLER that further reduces the heat load on the radiator. All parts are designed to be compatible with the original fourth generation Corvette wiring and parts, allowing you to complete a restoration or replacement project without incident. Posted on: 2014/10/23 3:43. Cooling off that c4 corvette. The theory is sound and very much proven, but the LT1 throws a small wrench in the theory. Both fans should run at low speed. Remove A/C high pressure line at front bracket.
LT5, Marc Haibeck ECM module, AUTOMATIC!!! Torque remaining bolts to 18-23 ft. lbs. Buy a CHEVY SHOP MANUAL FOR YOUR YEAR CORVETTE! Did you previously have and then delete the oil cooler option? Start engine and let it reachnormal operating temperature. Blocked radiators generally occur on units that have accrued miles and not on new vehicles. Place a 1/8″ bead of RTV sealant (or equivalent) all around the thermostat housing sealing surface on the intake manifold. Highly modified engines work best when both of the fans come on simultaneously. C4 corvette cooling system diagram 2007 x3. Photography by James Berry. Your Corvette's main cooling fan is controlled by the PCM.
Sometimes things "stick" to the threads and just rip out and totally wreck the threads. I just can't seem to get all the air out. It is very possible to have a failed sensor for the ecu or a damaged harness or unplugged sensor and have the ecu read -40f for coolant temp. Mixing two non-compatible anti-freeze types. Remove the air management valve adapter. Btw torque converters are frequently painted with a very special paint that changes color at a specific temperature for the exact same reason, proof you voided the warranty and failed to run the transmission fluid thats supposed to act as a lubricant and coolant within the designed temperature range, they did not select the pink or purple because they like the color, its done to reduce warranty cost issues, if you over heat the converter its waranty is void. I know several people that ordered trans coolers and found they would not fit into the originally intended location because they failed to correctly measure the intended location space, in ALL three dimensions, and over the whole space, before ordering, I know I failed to measure carefully so I was forced to place it where the spare tires normally mounted. If coolant is not at this level during operating conditions, coolant should be added only to the reservoir to raise the level to the "FULL" mark. Read this related linked info post carefully. C4 corvette fuel system diagram. 1992-1996 Corvettes do not have oil coolers due to clearance issues when the catalytic converters were moved close to the oil filter. We have had both the heavy duty and standard duty radiators out of the 1985-89 models and could not see any major differences.
Verifying at the negative battery terminal will ensure you're circuit is making a good connection to the chassis ground. "HOSE, PLENUM AIR BLEED"??? Must be good if the driver side fan works. Remove heads, but lay them aside for now and check the block first. The car had been in a fire. Improperly performed vehicle repair can result in damage, injury, and even death. Be sure to keep coolant in the filling funnel. 05-08-2006 05:58 PM. 1990-1991 Corvettes also may have an oil cooler. These charts are for the 1985-89 vette cooling fans. BTW you may find freeze plugs that look like this on blocks and cylinder heads, especially from engine rebuilder machine shops, the "exterior outside BUTTONs are made from a very special low melt metal like bismuth thats specifically designed too melt and distort if the blocks coolant temp reaches about 250-260F indicating and proving beyond question that you over heated the engine and voided your warranty. There is a different sensor for the gauge than the ecm or fan control. Do not dispose of coolant into the sewer system or ground water.
Inspect thermostat to see if it opens completely. When maximum cooling is required, the PCM energizes all three cooling fan relays. Also, when engine speed is over 3500 rpm and oil temperature is over 261°F low fans will come on. This can be done by probing the engine with a sounding bar (or large screwdriver. I am not sure if they are connected correctly. Remove lower radiator and heater hose at water pump. Installing our 243108 thermostat allows the engine to run in the 185-192 degree range.
DC Voltage tests: 1. Has a rather marginal cooling system if your engines been modified for significantly higher hp levels, that cooling system can be significantly improved upon. If the thermostat was removed for replacement or flushing, fill the engine block with coolant before installing the thermostat, this is not necessary but makes it easier to get all of the air pockets out. Some cars have as many as 4 or 5 temp sensors. A/C head pressure above 248 psi. As such I can say with certainty that a 160 degree thermostat makes no difference in power. Incorrect ignition timing. Remove upper fan shroud.
It's best to raise the vehicle and make sure that it is level for getting the coolant out. All of the aftermarket cooling fan switches have harnesses provided to connect the new style connector. LT5 is in there VIN J section, but NOT in same section for VIN 8... Posted on: 2014/10/22 14:08. Connect the new harness to the switch and route the leads over to the fan relays mounted on the radiator housing. Torque to 25-35 ft. lbs. And the other is a 2 wire sensor for the ecu. I know it will be difficult to determine if everything is correct on the car through. '90 onward; both fans on ECM; no temp switch. The heads are the most complex pieces as far as coolant passages are concerned. When high fans are commanded they are wired in parallel. The oxygen sensor works more efficiently at high exhaust temperatures promoting less fuel usage and emissions.
Wire for high speed. Defective or the wrong water pump. Are you getting bubbles on a warmed up engine? Defective sensors or connections too sensors. If the radiator cap is removed from a hot cooling system, serious personal injury may result. IVE SEEN THIS INFO POSTED BUT NEED TO VERIFY IT. Connect one of the new harness wires to the dark green/white wire. But it is my hope some guru who has done a mini ram swap will be able to look at the coolant hoses and vacuum lines in the photos and let us know how we can complete this properly. Confirm continuity with the end of the dark blue wire and the socket for pin 86 for relay 2 AND relay 3. This code will not will not affect engine performance in any way. Monitor the coolant temperature during this time and make sure not to overheat the vehicle.
Obviously the first step in testing an over heating issue would be to verify the coolant and oil levels and verify the fans turn on and the water pumps pushing fluid thru the engine, and your not dealing with a defective t-stat or clogged radiator. Minimum "ON" time for HI speed fans is 30 seconds. 1996 Corvettes will have an SES light illuminate when the fan switch is installed due to the PCM noticing the fan operating when it should not be. Radiators, Fans, Shrouds, and Cooling.
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