Heater
Thread Starter
Melting Slicks
Joined: Jul 2010
Posts: 2,793
Likes: 333
From: Leesburg Fl
2018 C5 of Year Finalist
St. Jude Donor '14,'18
Heater
In Central Fl. it's gotten cold so I used the heat. At a stop light the heater blows cool. Today I put it in N and pulled up the R's some and got heat. Any ideas???
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Racer
Joined: Aug 2016
Posts: 310
Likes: 25
From: Edmonton AB
My completely uneducated opinion...
We have an SUV that does the same thing. Coolant is a few years old, system has been flushed, water pump is brand new and collant is full. At idle, the heat is lukewarm. When driving (when revs are up) it is HOT.
My guess, in our instance, is that when you are at idle, the waterpump is not spinning all that fast - not much coolant being forced through the heater core. When revs pick up, waterpump spins faster forcing more (hot) coolant through the heater core.
Or - coolant level is low, and when you rev your engine it forces more coolant through the heater core.
Those are the first two things I would consider.
We have an SUV that does the same thing. Coolant is a few years old, system has been flushed, water pump is brand new and collant is full. At idle, the heat is lukewarm. When driving (when revs are up) it is HOT.
My guess, in our instance, is that when you are at idle, the waterpump is not spinning all that fast - not much coolant being forced through the heater core. When revs pick up, waterpump spins faster forcing more (hot) coolant through the heater core.
Or - coolant level is low, and when you rev your engine it forces more coolant through the heater core.
Those are the first two things I would consider.
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Thread Starter
Melting Slicks
Joined: Jul 2010
Posts: 2,793
Likes: 333
From: Leesburg Fl
2018 C5 of Year Finalist
St. Jude Donor '14,'18
Thanks everyone. I'll check the coolant level but it was just serviced. Never heard of air in the coolant. Don't think the thermostat would cause this but who knows. Operating temp seems ok.
It will warm up next week so I won't need heat.
It will warm up next week so I won't need heat.
Pro
Joined: Jan 2006
Posts: 571
Likes: 29
From: Delanson New York
Sounds like an air bubble in the system. If you park it when the engine is warm on an incline the bubble may work its way out as the car cools down. Make sure there is coolant in the reservoir first.
Thread Starter
Melting Slicks
Joined: Jul 2010
Posts: 2,793
Likes: 333
From: Leesburg Fl
2018 C5 of Year Finalist
St. Jude Donor '14,'18