1994 Toyota Surf Overheats when AC is on

Xulfiqar (Xulfiqar) 2025-07-12 10:08:34 +0500 #21

Is the cooling system fully intact and in fully working order or has something been done to it like a missing thermostat etc?

dani_kk (Dmotorsports) 2025-07-12 15:12:48 +0500 #22

Any recent engine head or head gasket job done?

dada033136 (saeed khan) 2025-07-12 16:35:35 +0500 #23

Yes clutch fan

dada033136 (saeed khan) 2025-07-12 16:40:29 +0500 #24

The thermostat has been recently removed like a week ago as mechanic said it will improve the performance and cooling will be improved, but its same like before no change.

dada033136 (saeed khan) 2025-07-12 16:42:08 +0500 #25

The engine was overhauled (completely rebuild) 7 months ago. At that time it was cold and did not need to run AC, but when summer came and turned on the AC then I got to know that it heats up with AC.

Xulfiqar (Xulfiqar) 2025-07-12 20:19:40 +0500 #26

First get the basics right.

Does your mechanic own an infrared thermometer gun? Or even a basic ntc and a dmm?

That way you can gauge actual temperature of the engine and eliminate if the gauge is lying to you. (Its quite common on these old hilux vehicles). Also make sure all ground straps are in place too,

Is it original engine or a swap?

Is the cooling fan a clutched type? If it is then does it actually roar when the engine faces an overheat condition? Is the fan shroud intact? (Its necessary to make the clutch function)