1998 GMC Sierra heat not working
60

Asked by Dpenna21 Jan 03, 2019 at 09:39 PM about the 1998 GMC Sierra 1500 K1500 SL 4WD Standard Cab LB

Question type: Maintenance & Repair

I just bought this 1998 GMC Sierra .. and it i can
only get cold air  blowing out of the defrost.. no
where else and no hot air .. i checked the actuator
by the steering wheel under the dash(which i
believe to be the mode actuator from research)
and it doesn’t seem to move at all.. i have a new
one coming in tomorrow .. and if i put in the new
actuator and it still doesn’t work .. would you
suggest changing the climate control assembly?

4 Answers
143,955

T_S_T answered 5 years ago

First check your heater core to make sure it is connected and not by passed,if connected check your thermostat both of these will cause a no heat issue,then follow through with what you said.

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60

Dpenna21 answered 5 years ago

I will definitely.. but as i said where the air goes i cannot change either but we’ll see what happens .. I’ll let you know

2 people found this helpful.
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60

Dpenna21 answered 5 years ago

Ok so i checked everything replaced t-stat which was bad.. replaced mode actuator and nothing changed do you think it would be the climate control ?

2 people found this helpful.
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