2002 alero no heat

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dmc

2002 alero no heat

Unread post by dmc » Tue Feb 16, 2010 10:18 am

We have replaced thermostat, water pump, flushed system core seems to be fine still no heat

JK

Re: 2002 alero no heat

Unread post by JK » Tue Feb 16, 2010 7:15 pm

If engine temperature is getting to proper temp, check to see if both hoses on the heater core are hot. One should be hot, the other cooler. If the same, then no flow throught the core.
Possibly a problem with the heater A/C temp door in the dash.
Also had a weird one on a 4 cylinder where someone put a thermostat in the housing of the upper radiator hose at the cylinder head. They assemed the t-stat should be there, but it does not go there. So, basically they had 2 thermostats in the system.

Beginnermechanic
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Joined: Tue Mar 22, 2016 1:19 pm

2004 alero fans not turning on

Unread post by Beginnermechanic » Wed Mar 30, 2016 11:52 am

Fans are not turning on. i have to turn on/off my ac so the fans to turn on my relays are good i just dont know what it is

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TerryAuto
Posts: 313
Joined: Fri Dec 11, 2009 8:48 pm

Re: 2004 alero fans not turning on

Unread post by TerryAuto » Mon Apr 04, 2016 11:51 pm

How do you know the relays are good? There are several in this system, and they all work through each other.

If you are sure, then you could have a wiring problem to one of the relay terminal connections or a coolant temp sensor not reading correctly.

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