temp problem HZ kingswood - Aussie V8 | Holden - Ford

Daryn · 07-03-2006, 09:22 PM

In the girlfriends wagon, when she's driving the temperature goes through the roof. But when she stops at the lights or something, it cools down. Any ideas?

dr.legal · 07-03-2006, 09:43 PM

Do you have a thermostat fitted? If you don't, when the revs are higher, the water flow increases and the coolant in the radiator rushes through too fast to be cooled enough. When the revs decrease to idle, the coolant flow slows and so does the speed of the coolant through the radiator. This should give it enough time to transfer the heat out of the engine. The thermostat is designed to speed up the initial warm up of the engine but when it opens, it still restricts the flow to the correct speed. I'd say check the thermostat first before anything.

Daryn · 07-03-2006, 09:49 PM

Not sure if she has a thermostat in it or not. I'll check it out. It only started doing it this arvy.

dr.legal · 08-03-2006, 08:03 AM

Just another thought while you have the coolant out. How old is the water pump? If it's corroded on the impellor, you may have lost some of the vanes. When the engine is revving, you need extra cooling efficiency. If one or more of the vanes are gone, that will be reduced. Check the pulley mount to shaft to see if it's loose. It's only a gasket to remove the pump. Also check that the fan belt is tight enough. Also, why not clean out the cooling system while it's empty? That way you can make sure it's not sludge. Just a small thought. Is it getting physically hot or is it just indicating hot. I had a mate who thought his car was overheating. Replaced the whole cooling system, even the gauge. Turned out it was a faulty sender unit.

Daryn · 08-03-2006, 09:28 AM

All good points there doc, I'll check them all out.

hx sandman · 14-03-2006, 02:50 PM

as doc said it will be the thermostat because as the revs are higher the water goes through the engine alot faster and cant have time to cool down
what the thermostat does

dr.legal · 14-03-2006, 06:51 PM

How did it go Daryn?

Daryn · 14-03-2006, 07:44 PM

Ended up being a faulty sender. Cheers for the help.

07-03-2006, 09:22 PM	#1 (permalink)
Daryn Super Moderator Trade Rating: (0) Join Date: Jul 2004 Location: rockhampton, qld Ride: VS ute Posts: 3,826	temp problem HZ kingswood In the girlfriends wagon, when she's driving the temperature goes through the roof. But when she stops at the lights or something, it cools down. Any ideas? __________________ amore...odio...tragedia

07-03-2006, 09:43 PM	#2 (permalink)
dr.legal Part of the furniture Trade Rating: (0) Join Date: Oct 2005 Location: Diamond Creek, Victoria Ride: VX Commy Posts: 1,477	Do you have a thermostat fitted? If you don't, when the revs are higher, the water flow increases and the coolant in the radiator rushes through too fast to be cooled enough. When the revs decrease to idle, the coolant flow slows and so does the speed of the coolant through the radiator. This should give it enough time to transfer the heat out of the engine. The thermostat is designed to speed up the initial warm up of the engine but when it opens, it still restricts the flow to the correct speed. I'd say check the thermostat first before anything. __________________ No matter where you go, there you are.

07-03-2006, 09:49 PM	#3 (permalink)
Daryn Super Moderator Trade Rating: (0) Join Date: Jul 2004 Location: rockhampton, qld Ride: VS ute Posts: 3,826	Not sure if she has a thermostat in it or not. I'll check it out. It only started doing it this arvy. __________________ amore...odio...tragedia

08-03-2006, 08:03 AM	#4 (permalink)
dr.legal Part of the furniture Trade Rating: (0) Join Date: Oct 2005 Location: Diamond Creek, Victoria Ride: VX Commy Posts: 1,477	Just another thought while you have the coolant out. How old is the water pump? If it's corroded on the impellor, you may have lost some of the vanes. When the engine is revving, you need extra cooling efficiency. If one or more of the vanes are gone, that will be reduced. Check the pulley mount to shaft to see if it's loose. It's only a gasket to remove the pump. Also check that the fan belt is tight enough. Also, why not clean out the cooling system while it's empty? That way you can make sure it's not sludge. Just a small thought. Is it getting physically hot or is it just indicating hot. I had a mate who thought his car was overheating. Replaced the whole cooling system, even the gauge. Turned out it was a faulty sender unit. __________________ No matter where you go, there you are.

08-03-2006, 09:28 AM	#5 (permalink)
Daryn Super Moderator Trade Rating: (0) Join Date: Jul 2004 Location: rockhampton, qld Ride: VS ute Posts: 3,826	All good points there doc, I'll check them all out. __________________ amore...odio...tragedia

14-03-2006, 02:50 PM	#6 (permalink)
hx sandman casual poster Trade Rating: (0) Join Date: May 2005 Location: perth Ride: 77 hx panelvan Posts: 92	as doc said it will be the thermostat because as the revs are higher the water goes through the engine alot faster and cant have time to cool down what the thermostat does

14-03-2006, 06:51 PM	#7 (permalink)
dr.legal Part of the furniture Trade Rating: (0) Join Date: Oct 2005 Location: Diamond Creek, Victoria Ride: VX Commy Posts: 1,477	How did it go Daryn? __________________ No matter where you go, there you are.

14-03-2006, 07:44 PM	#8 (permalink)
Daryn Super Moderator Trade Rating: (0) Join Date: Jul 2004 Location: rockhampton, qld Ride: VS ute Posts: 3,826	Ended up being a faulty sender. Cheers for the help. __________________ amore...odio...tragedia

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