Question about 1985 Oldsmobile Delta 88

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85 olds delta 88 blows cold air from heater

Every thing is in proper order. that is what is making it hard.

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  • drbussard Mar 08, 2009

    regarding 85 Olds Delta 88 which blows only cold air .. we have replaced thermostat, the heater hoses are hot, have flushed radiator & coolant is good .. air blows strong, can adjust flow (low to high) but NO HOT AIR, no matter how long we let it run .. car does not overheat .. hopes this helps clarify what I'm dealing with .. my wife wants her car to be drivable year round and not just for summer :-)

  • Roberta Smith
    Roberta Smith May 11, 2010

    feel the heater hoses.. are they both hot ?



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If your coolant is full, and the car is not overheating, it's probably not your thermostat, but you might want to make sure. Look on the heater hoses running to the heater core - there should be a solenoid valve in the supply one (I think it's a vacum solenoid). That ****** is probably toast.... I believe it's meant to shut the coolant flow off when the aircon comes on. You can either whack it, replace it, or, if the aircon doesn't work anymore, remove it and put a coupling in there.... if it's not that, then your heater core is probably plugged.

Hope this helps :)

Posted on Mar 08, 2009

  • John Aman
    John Aman Mar 08, 2009

    Did you check for the valve I mentioned in the lines going to the heater core?

    The only other thing I can think of is the hot/cold temperature slider - If you don't have Automatic Temperature Control, I believe it's just connected through a cable to a door in the air supply. You should feel some resistance when you slide the control, and if you slide it from hot to cold quickly, you should be able to hear it slam the door closed (in other words, make sure the cable is operating the door)



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