1987 Chevy Camaro temp jumps at shut off

1987 CHEVROLET CAMARO
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MACDADEE
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Engine Cooling problem
1987 Chevy Camaro 6 cyl Two Wheel Drive Manual 110k miles

step 1. new water pump, thermostat, radiator cap, hoses. step 2. engine temp maintains 200-220 while driving in traffic or over the road. shut the car off and temp jumps and pressure escapes through radiator cap. (no relief valve) installed new cap w/relief valve, same thing. let the car cool, start and add coolant/water approx 1/2 gal brings coolant level back nearly full after the thermostat opens. go back to step 2. rinse & repeat. what gives??
Oct 21, 2008 at 1:12 AM
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RASMATAZ
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Hi macdadee and welcome to 2carpros

Try bleeding the cooling system out

BLEEDING COOLING SYSTEM

Always bleed air from cooling system after replacing coolant. Set heater for maximum heat. Remove radiator cap. Loosen drain plug and remove drain bolt (if equipped) from engine block. Drain coolant reservoir. Fill coolant reservoir to MAX mark with 50/50 water-coolant mixture. Loosen bleed bolt and fill radiator up to base of filler neck. Close bleed bolt when coolant flows out without bubbles. Tighten bleed bolt. With radiator cap removed, start and operate engine to normal operating temperature. Add coolant if necessary and check for leaks.
Oct 21, 2008 at 3:45 AM
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RASMATAZ
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Ive been informed by an associate this problem is also common to headgasket leaks that can be unnoticeable

Get it block and pressure tested
Oct 21, 2008 at 4:14 AM
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