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Engine temperature

Cussboy on Wed May 26, 2010 9:35 AM User is offline

Year: 1988
Make: Mazda
Model: B2200
Engine Size: 2.2
Refrigerant Type: R-12
Ambient Temp: 100
Pressure Low: 30
Pressure High: 240
Country of Origin: United States

Does anyone know if an older AC compressor can require more physical resistance to turning when engaged than when it was new, contributing to engine running higher than normal temperature (dashboard guage) only when the AC is switched on, and on longer uphill highway climbs? Fan clutch is quite new, coolant is fresh 50%, radiator is 2 years old and clean, fan shroud is in place, engine not running lean or loosing coolant through leak or head gasket failure. I understand that the air passes through the (hot) condenser first then through the radiator, but I doubt that the condenser temperature is higher than "normal" since the AC cools well. Any ideas?

TRB on Wed May 26, 2010 12:04 PM User is offlineView users profile

Same model compressor. Only reason is the pistons are tightening up meaning a failure in the future. Lack of lubrication could be an issue also.

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Cussboy on Wed May 26, 2010 2:41 PM User is offline

Yes, same model of AC compressor, one of your rebuilds from about 2004. Right now I just turn off the AC just north of Black Canyon City on the way north...my truck has only about 80 hp anyway (Cab Plus) so it needs to work hard regardless going up those hills at 60-65 mph...

TRB on Wed May 26, 2010 2:47 PM User is offlineView users profile

Sanden will take about 4HP to operate with normal pressures. As the high side goes up so will the resistance

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

bohica2xo on Wed May 26, 2010 2:55 PM User is offline

How old is the thermostat in the cooling system?

I have seen a weak thermostat cause this exact issue. It will open far enough to keep everything working under light loads. Add the hot air off of the condensor, and a hill... HOT.

Replaced a radiator, fan clutch, and did all of the usual stuff on a '79 Courier (mazda) once. It would do the same thing. Pulled the thermostat, and put it in a pot of boiling water. It would open about 3mm. A new unit would open 9mm in the same pot.

I like to drill a .093 diameter bleed hole in any thermostat I install. This lets a small flow past the capsule, and seems to make the unit modulate better. It also helps bleed the system on a cold fill. Year ago good thermostats had a bleed hole in them. Some had a rivet floating in the hole that did not seal it, but was put there for metering.

B.

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"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

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