why heat doesnt work while idleing but works when going down road

Asked by GuruXMX25 Nov 20, 2018 at 09:42 PM about the 1999 GMC Sonoma 2 Dr SLE Extended Cab SB

Question type: General

heat doesnt work while sitting idleing. but works going down the road. or reved
up.

1 Answer
42,870

Hornet_2497 answered 5 years ago

Radiator is low on coolant. Top it up and drive it to work out air bubbles. Then top it again later.

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