Further to Hilux problem, overheating

Submitted: Tuesday, Jan 27, 2009 at 16:08
ThreadID: 65457 Views:2768 Replies:7 FollowUps:8
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On going back to when problems first arose, it was the air con that first started to cut out. Took it back to the panel repairer and he said it was the age of the car.
What happens now is the air con cuts out followed by the car overheating.
Does anyone know if the air con cutting out can cause the motor to overheat?
To recap: the fan hub/clutch has been replaced with genuine Toyota part; new radiator fitted during smash repairs middle of last year; new radiator cleaned out last week(25% gunked), radiator pressure tested, rows of tubes checked -ok; cap checked; thermostat works; motor flushed; no bubbles in coolant under pressure test.
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Reply By: Cruiser Crazy - Tuesday, Jan 27, 2009 at 16:34

Tuesday, Jan 27, 2009 at 16:34
Does everything electrical stop? Or only the airco & radiator fan? Is the radiator fan blowing when it starts overheating?

Cruiser Crazy
AnswerID: 346179

Reply By: Member - Kiwi Kia - Tuesday, Jan 27, 2009 at 16:49

Tuesday, Jan 27, 2009 at 16:49
Twinkles, A brand new radiator was "25% gunked up" in only 6 months ? What was the nature of the "gunk" ? Were you referring to the inside of the radiator ?

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AnswerID: 346182

Follow Up By: Twinkles - Tuesday, Jan 27, 2009 at 17:39

Tuesday, Jan 27, 2009 at 17:39
The radiator bloke said it had sand and stuff from engine block. Don't know how it got in there.
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FollowupID: 614160

Reply By: Dave Thomson - Tuesday, Jan 27, 2009 at 18:12

Tuesday, Jan 27, 2009 at 18:12
Had a similar prob on my hilux and cut a LONG story the bottom tank has very little clearance took it to the radiator guy and he increased the clearance to 25 mm and bingo, best $100.00 I spent,
regards,
Dave
AnswerID: 346199

Follow Up By: Twinkles - Tuesday, Jan 27, 2009 at 18:19

Tuesday, Jan 27, 2009 at 18:19
What model Hilux? What is the bottom tank?
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FollowupID: 614164

Reply By: howesy - Tuesday, Jan 27, 2009 at 19:00

Tuesday, Jan 27, 2009 at 19:00
A common cause of sand like gunk is that the engine block and heater system havent been flushed out enough when replacing the radiator and coolant and the cooland used was incompatable with the old one. Do a search on a few forums on incompatable coolants and read the horror stories about the damage that can result from the this causing blockages in new radiators.
AnswerID: 346205

Follow Up By: Member - Graham H (QLD) - Tuesday, Jan 27, 2009 at 19:09

Tuesday, Jan 27, 2009 at 19:09
Wonder if the Aircon Compressor is seizing up putting extra load on the engine
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FollowupID: 614168

Reply By: mechpete - Tuesday, Jan 27, 2009 at 22:14

Tuesday, Jan 27, 2009 at 22:14
are you sure it is caused by the A/C cutting out . !!!! maybe the A/Con is sensing the engine temp getting to high , some systems these days have a thermal cut out or something similar to help protect engine , something doesn,t make sense when A/C cuts out it reduces the load on the engine
mechpete
AnswerID: 346228

Follow Up By: Twinkles - Wednesday, Jan 28, 2009 at 07:07

Wednesday, Jan 28, 2009 at 07:07
No we are not sure. I was exploring that as a possibility. In fact my daughter thinks the overheating comes first. Thanks. I think you're right.
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FollowupID: 614254

Reply By: Wherehegon - Tuesday, Jan 27, 2009 at 22:30

Tuesday, Jan 27, 2009 at 22:30
Age of the car !!!!!!!! What a wank. When I worked for Toyota we had issues with some of the imported vehicles when they had there services where the coolant was due for a change, cressida's were the worst. The coolant that they come into Australia was no compatible with the genuine coolant we use to use and if not totally flushed out properly including heater core, block etc the two would miix and the radiator would end up with a gel type substance and was generally blocked halfway across radiator virtually blocking it. It would have blocked totally but obviously customer would bring back in before any damage was done. The only way to fix it was obviously pull out the radiator send off to get cleaned out, then when it come back we would flush the blocks, heater cores, put a flush through them (would do this a few times) then send radiator off again to get any possible residue out. Did you always use genuine coolant but the smash repairer has used a cheapie one ?? Makes me wonder why it was blocked 25% with gunk (presume he's talking internal ??).......... Air con cutting out would not cause it to over heat. If anything it would be helping to make the vehicle run cooler as the condensor (in front of radiator) would start to cool down when air cuts out. Did they put a genuine condensor back in not a non genuine. I had an issue years ago where I had to replace the condensor in my corolla, I put in a non genuine one and bloody thing ran hot after that been fitted, took me a while to work it out but it turned out the cooling fins on the non genuine part ran the opposite way to the radiator which was restricting the air flow. I purchased a new genuine part which fixed the problem instantly, wasnt cheap. Sorry for the long post just trying to think of possible reasons...... WHG
AnswerID: 346230

Follow Up By: Twinkles - Wednesday, Jan 28, 2009 at 07:14

Wednesday, Jan 28, 2009 at 07:14
Thanks for your response. Don't know about the condensor replacement. The radiator has been removed, cleaned, engine flushed by Hasting's radiators and it still overheats. I'm assuming this would mean the coolant is not the problem. I'll have to get it to the mechanic fior more investigation.
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FollowupID: 614255

Reply By: Member - jeff r (NSW) - Wednesday, Jan 28, 2009 at 18:35

Wednesday, Jan 28, 2009 at 18:35
G'Day Twinkles

Think Head gasket,or cracked head !!!! Cause may not be related to accident???


See Yeah
AnswerID: 346402

Follow Up By: Twinkles - Wednesday, Jan 28, 2009 at 20:43

Wednesday, Jan 28, 2009 at 20:43
How do you diagnose a head gasket problem causing overheating? How do you tell if the exhaust is getting into the water?
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FollowupID: 614423

Follow Up By: stephen looking - Wednesday, Jan 28, 2009 at 20:52

Wednesday, Jan 28, 2009 at 20:52
Twinkles to see if exhaust gases are in your coolant get a radiator bloke to do a co2 test on the coolant. Takes about 5min and shouldn't cost much.

Cheers......Steve

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FollowupID: 614429

Follow Up By: Twinkles - Thursday, Jan 29, 2009 at 12:26

Thursday, Jan 29, 2009 at 12:26
Thanks Steve
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FollowupID: 614541

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