Question about 1991 Chevrolet Beretta
Blows cold air; replaced thermostat, doesn't change anything. Hose that goes from the thermostat down to bottom of radiator is collapsing intermittantly.
Looking at your description I feel a Air lock scenario?
Have you tried a system bleed?
Park vehicle on level ground, when cold remove coolant filler cap, start engine leave to idle, turn heater to max and blower full. Wait for engine to reach operating temp, keep clear of coolant filler, listen as hopefully gurgling then a boil over will occur, top up with very warm coolant wait as it may boil over again.
Check for heat inside vehicle, if hot replace cap but keep eye on temp as air lock may have just moved out of heater matrix/core so boil up may happen again.
If the bottom hose continues to constrict and heat inside car then possible head gasket issues.
Good luck! hope I sorted it for you? if so press the Blue button please! for my FREE effort's I Thank You!
Paul 'W' U.K.
Posted on Feb 01, 2009
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