Last post on Oct 09, 2013 at 12:50 AM
You are in the Maintenance & Repair
What is this discussion about?
#590 of 631 Re: BIG HEADACHE!! [rickysmyboy]
by MrShift@Edmunds HOST
Apr 06, 2010 (9:12 am)
You'd have to pull it out and have it flow-tested.
Again, if you have high speed overheat, this is probably not a fan problem (air problem).
May 29, 2010 (4:07 pm)
Ok let's see how smart you guys are.
1984 Corvette 5.7L with 100+K miles runs hot at lower speeds. Gets up to a 235 temp before radiator fan kicks on and cools things off. Runs normal at highway speeds.
Am I looking at a sticking thermostat or a defective fan switch or something major?
#593 of 631 Re: Solve This One [oldfarmer50]
by MrShift@Edmunds HOST
May 29, 2010 (5:17 pm)
If you overheat at lower speeds but not at higher speeds, you have an AIR circulation problem, not a coolant circulation problem.
#594 of 631 Re: Solve This One [oldfarmer50]
May 30, 2010 (2:24 pm)
Your car may be running correctly.
Does it hit 235 before fans with the AC off? Or is your AC dead and not running? The Cadillac referenced below will not let the AC turn on if the AC pressure is low or high.
In other words, for Cadillas Northstars, if you are running the car with the AC off, it is set to let the temp hit about 225 before it turns the fans on. That's just the way they programmed it.
If you have the AC working and on, the fans run all the time (above 195 or so??).
#595 of 631 Re: Solve This One [Mr_Shiftright]
May 30, 2010 (4:45 pm)
"...you have an AIR circulation problem..."
That's interesting. This is a car my son is considering so I have not driven it myself. I'm being told that for some reason the fan does not kick on until about 235 and then it does come on. The present owner say the AC does not operate as it needs some sort of valve. Not sure if one has anything to do with the other but any thoughts would be welcome.
I'm trying to let my son make his own decisions but the urge to "protect" him is still very strong even though he's 25.
#596 of 631 Re: Solve This One [bolivar]
May 30, 2010 (4:57 pm)
"...Does it hit 235 before fans with the AC off?..."
Can't say for sure. As I just posted to Shifty, the owner says the AC does not operate. As I understand it, when driving in the city at slower speed the temp reaches 235 and the fan comes on and the car cools to "normal" whatever that is ( for most cars I've owned that would be around 195).
Remember, this is and OLD Corvette so I don't know if the computer in it is very fancy. That's why in my original post I was wondering if it could be so sort of mechanical switch which was the problem. If this is typical of all GM cars that would be fine. I just don't want my son to buy this and find out it's a money pit.
#597 of 631 Re: Solve This One [oldfarmer50]
May 30, 2010 (9:31 pm)
With an '84 vette you might want to check the body out closely since the frame wasn't the best leading to a lot of flexing causing the fiberglass to crack. If I were looking to buy a used vette, I'd look at a C5 or newer as the C5 has hydroformed rails which means a much stiffer suspension and no creaks or body cracks. Just my opinion of course.
#598 of 631 Re: Solve This One [oldfarmer50]
May 30, 2010 (10:42 pm)
84 Corvette will be a money pit.
#599 of 631 Re: Solve This One [bolivar]
May 31, 2010 (3:35 am)
As was my '75.