1998 Olds Bravada Heater blows Cold...

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

rnutts - 12 Dec 2005 04:42 GMT

After replacing the water pump and thermostat on my 98 Bravada, the HVAC
air door (whatever it's called) started to open and close every few
seconds. The system would blow very hot air then cool air whether heat was
on or AC was on regardless of temp setting or in auto setting. Now we don't
hear the door opening and closing and the it only blows cool air. I might
add that I put stop leak in the radiator to buy some time till I could
replace the water pump and have since flushed the system. If anyone can
offer any ideas on this we would be forever grateful.

Reply to this Message

Silver Surfer - 12 Dec 2005 05:12 GMT

Have you checked the 10-amp HVAC1 fuse in the instrument panel fuse block?

Is your HVAC system automatic or manual?

It's difficult to figure out what was causing your cycling problem without
knowing which system you have.

> After replacing the water pump and thermostat on my 98 Bravada, the HVAC
> air door (whatever it's called) started to open and close every few
[quoted text clipped - 5 lines]
> replace the water pump and have since flushed the system. If anyone can
> offer any ideas on this we would be forever grateful.

Reply to this Message

rnutts - 12 Dec 2005 15:07 GMT

I havn't checked anything since the door stopped opening and closing last
night. I went through each fuse that was labeled for the HVAC system or
might be part of the system. There may be a bad fuse at this time, but I
won't know till I can check (I'm not failing to locate a fuse block I
hope-one on left side of engine bay and another on left side of dash
accessible with door open). I believe this system is automatic, I has
computer climate control molded into the lower side of the control panel.
It does have manual settings though.

Thanks for your quik response to this. Jim N.

Reply to this Message

Silver Surfer - 12 Dec 2005 19:31 GMT

Your HVAC system is rather sophisticated. There are at least five
temperature sensors that feed into the Electronic Climate Control module.
The air temperature door actuator motor itself is equipped with a feedback
potentiometer and a logic module also. That unit might be my first choice
for looking at based on your description.

>I havn't checked anything since the door stopped opening and closing last
> night. I went through each fuse that was labeled for the HVAC system or
[quoted text clipped - 6 lines]
>
> Thanks for your quik response to this. Jim N.

Reply to this Message

rnutts - 13 Dec 2005 01:33 GMT

Reply to this Message