Question about 1986 Pontiac Fiero
Well fieros are very different cars you need to fill collent in a speical way so air doesnt get in the lines most fiero owners do not know this but it very important The best way to tell it is for wikipedia
Cooling system issues
With an already hot normal operating temperature of 220 °F (104 °C) prior to the recall switching to a 195 °F (91 °C) thermostat, the mid-mounted engine utilized long pipes to carry coolant to the front-mounted radiator. This demanded that a special coolant filling procedure be followed to prevent severe overheating. Simply pouring coolant into the thermostat housing (on the engine) would leave an air bubble in the radiator, while adding coolant just to the radiator would leave an air bubble in the engine's coolant passages. Proper procedure (with engine idling and the thermostat removed, filling the thermostat housing, burping the bubble out of the radiator by cracking open the radiator cap until coolant exits) must be followed in order to ensure an air-free cooling system.
A second problem has become common as more Fieros are being serviced by shops unfamiliar with their design. The under-body coolant tubes are positioned in such a way that a casual glance beneath the car will not suggest their fragility. As a result, many have been crushed by shop lifts, resulting in a near complete lack of engine cooling. The age of the car means that even GM dealerships may now be unaware of the proper jacking methods.
Lastly, the absence of a spare tire (at the front of the car, right behind the radiator) could have an effect on coolant system performance. i dont know who wrote this and i dont take credit for it
Posted on Nov 19, 2009
The 1st answer is mostly correct. All except for the 'spare tire' comment. In addition to the crushed pipe inspection, there is also an air dam/front spoiler underneath the bottom of the radiator up front that does more than you might think:
1st: It creates an area of higher pressure in front of the radiator forcing more airflow at any given speed through the core.
2nd: It creates an area of lower pressure behind the core so that airflow through it is increased at any speed.
These tend to be bent up from many instances of owner's bottoming out over the last 30 years.
I have also had the pleasure of owning an '86 GT V6 that had the coolant fan motor, the coolant fan relay, and the temperature controlled turn on switch, ALL go bad. If you have a V6 with A/C (hope you aren't wasting your time on a heater & keys 4 cyl.), with the key on and the engine NOT RUNNING, push either of the 3 A/C buttons (MAX, NORM, B/L) and see if the radiator fan turns on. If not, go back to the engine compartment and see if the engine compartment air circulation blower is pushing air out of the silver pipe pointed at the distributor and/or rear of alternator. If it is blowing air but the radiator fan is not turning, then you have an electrical problem somewhere between the switch. the relay, and the elec. motor.
Worst case scenario, you have a blown head gasket and the engine is pushing combustion gasses at high temp. and pressure into the cooling system until it reaches 15 psi, then the front radiator cap opens and lets all your coolant out, causing a runaway overheating situation. If properly filling the radiator, and running it with the fan on doesn't keep your engine temps under control, maybe have a shop 'SMELL' your coolant at the cap/fill area. If they can detect CO or HC's out of the cooling system, then it looks like your heads need to come off. :-( Good Luck!! And HAPPY FIERO-ING!!
Posted on May 09, 2016
Air cannot pass through the radiator efficiently if it cannot evacuate from beyond the radiator. The radiator is positioned in a manor that directs the hot air up and trapping it. I removed a section of the front hood making sure I did not get into the storage gasket area. I then bonded a fiberglass cowl induction scoop to cover the opening and to assist in channeling the hot air out from under the hood. Some have installed slotted panels. The best bonding material for any fiberglass is "Vette Panel Adhesive". It sands like bondo and is stronger than fiberglass. Keep it Cool!
Posted on Feb 07, 2010
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