Random Overheating?

scruffboy · 02-21-2007, 02:57 PM

Have you tried getting any codes from the diagnostic box? That could give you a place to start looking. It may be a faulty coolant sensor, but you'll have to check. There are a lot of places to find the code "definitions", but I forgot the site's name that I used. Maybe someone else here can point him in that direction. I know you guys helped me with this.

Scruffboy

dave in indy · 03-20-2007, 02:20 AM

I had the same problem. Look for scale or mineral deposits on your radiator. I had a hair line crack on my radiator at the neck for the upper radiator hose. I would pop the hood and not see any coolant leaking. Then when I woke up I'd find a puddle of coolant under the car.

MRice · 03-22-2007, 03:22 AM

All great comments and things ive mostly looked into spring is back and my cars on the road but about 5mins into driving it still overheats and it appears steam is comming from my rad but looks as if might be the rad cap because the rad is new and was compression tested recently (Aka after it started overheating)

So I guess ill change the rad cap and if that dosnt work whatre your thoughts?

MRICE
Cheers

Bill UK · 03-24-2007, 05:22 PM

One possible cause could be that you have no impellor blades on your water pump! As I found out on one of my supras which previously had a few BHG `s The coolant becomes acidic/corrosive when mixed with combustion gases and etches away the impellor blades. The cost of new Toyota water pump is about $200 but you can get a new Aftermarket pump for $70 . Many supra owners in the UK use this company https://www.sapmotorparts.com but you should be able to find one similar in US. Below is a pic of a Toyota pump and an aftermarket one, as you can see the Toyota one has thin pressed-steel blades and the aftermarket one has thicker cast blades.

02-21-2007, 02:57 PM	#1
scruffboy walbro fp Join Date: Sep 2005 Location: Kearny, New Jersey, USA Posts: 427	Re: overheating Have you tried getting any codes from the diagnostic box? That could give you a place to start looking. It may be a faulty coolant sensor, but you'll have to check. There are a lot of places to find the code "definitions", but I forgot the site's name that I used. Maybe someone else here can point him in that direction. I know you guys helped me with this. Scruffboy

03-22-2007, 03:22 AM	#3
MRice Stock Join Date: Nov 2006 Location: Regina Posts: 9	Thanks All All great comments and things ive mostly looked into spring is back and my cars on the road but about 5mins into driving it still overheats and it appears steam is comming from my rad but looks as if might be the rad cap because the rad is new and was compression tested recently (Aka after it started overheating) So I guess ill change the rad cap and if that dosnt work whatre your thoughts? MRICE Cheers

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03-20-2007, 02:20 AM	#2
dave in indy Stock Join Date: Mar 2007 Location: indiana Posts: 4	I had the same problem. Look for scale or mineral deposits on your radiator. I had a hair line crack on my radiator at the neck for the upper radiator hose. I would pop the hood and not see any coolant leaking. Then when I woke up I'd find a puddle of coolant under the car.

03-24-2007, 05:22 PM	#4
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	One possible cause could be that you have no impellor blades on your water pump! As I found out on one of my supras which previously had a few BHG `s The coolant becomes acidic/corrosive when mixed with combustion gases and etches away the impellor blades. The cost of new Toyota water pump is about $200 but you can get a new Aftermarket pump for $70 . Many supra owners in the UK use this company https://www.sapmotorparts.com but you should be able to find one similar in US. Below is a pic of a Toyota pump and an aftermarket one, as you can see the Toyota one has thin pressed-steel blades and the aftermarket one has thicker cast blades.