Question about 1991 Chevrolet Beretta

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1991 Chev Beretta blows cold air

Blows cold air; replaced thermostat, doesn't change anything. Hose that goes from the thermostat down to bottom of radiator is collapsing intermittantly.

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  • o2bxild Feb 02, 2009

    Clarification response:

    OK, it's a 2.2L engine and upon further inspection have found that someone disconnected the hoses going into the heating unit area, and reconnected them together, thereby bypassing the heating system altogether. My best guess is they were having either a problem with the heater core or the heater control valve (possibly both, I spose) and decided it was too much trouble to get to. Is there any sure-fire way to determine whether the heater core or the heater control valve is in need of being replaced? (It would be a real drag to replace the heater core and find that not to be the issue) Obviously, at this point, I have to get into the heating unit, regardless; one concern being the air-bag, as it does have one on the driver's side. I've ordered a Haynes manual for that make/yearish/model but have doubts whether its going to be much help.

  • Gary Loney
    Gary Loney May 11, 2010

    what motor does it have in it? Something doesn't sound right here....did you mean the hose that goes from the thermostat to the top of the radiator?

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Hi!
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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