heater core cleaning

Asked by Jan 13, 2016 at 07:56 PM about the 1999 Pontiac Grand Prix

Question type: Maintenance & Repair

1999 pont grand prix blower motor comes on
whenever i turn it on but no air presure. Nothing my
question is does the heater core have air flow thru
the body of fins and can that plug up ? How to
clean or what else could it be

2 Answers

25,625

maybe you have a nest of mice livin' up there- just sayin'

1 people found this helpful.
79,105

If critters have not moved in, check the ductwork under the dash. Something may have come loose and the air is not being directed to where it should be. One other possibility is the air conditioning may be stuck on a freezing up the cooling coil under the dash. This will usually be noticed as an airflow drop off to nothing though. Look for frost on the air-conditioning system hoses under the hood. HTH. - Jim

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