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no heat blows cold air only

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hogsnbeer
New User

Feb 7, 2010, 9:22 PM

Post #1 of 3 (4334 views)

no heat blows cold air only	Sign In

blows cold air only....97000 miles...1994 olds cutlass ciera 4dr v6 automatic......engine temp normal 195-205.....both heater hoses warm not hot... coolant level in radiator full..blower works fine .....I cant find the heater control valve location?..........thanks for any help Paul......

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Feb 8, 2010, 2:41 AM

Post #2 of 3 (4330 views)

Re: 94 Cutlass Ciera V6 no heat blows cold air only	Sign In

Couldn't find a control valve for the 3.1, if that engine for this which means temp is adjusted via a diverter door/blend door.

Does this have automatic climate controls?

Could be wrong but didn't think this vehicle had a radiator a cap but rather a pressure cap on recovery tank. Gotta know the coolant is truly full engine and radiator,

Several possibilities include:

* Actuator not moving or enough,
* Blend door stuck.
* Control head sending wrong signal.
* Low Coolant level - however both inlet and outlet hoses probably would be drastically different temps.
* Water pump unable to pump enough coolant - usually a gradual problem - poor heat not instantly no heat?

With temp noted at both heater hoses there should be some exchange of heat. If core was plugged up usually one hose would be cold or both cold. It's tough to tell by hand what the real temp of coolant in those hoses is without an IR thermometer. Coolant at even 180F or so is too hot to hold a hose (always use caution if by hand) thru the hose. Much less if directly - don't do that.

You stated cold air only. Is that truly cold or just not adequate?

T

nickwarner
Veteran / Moderator
nickwarner profile image

Feb 8, 2010, 10:32 PM

Post #3 of 3 (4319 views)

Re: no heat blows cold air only	Sign In

try bleeding air from the bleeder screws on the motor. these are known for air pockets that stop heat in its tracks

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