1999 Toyota Pickup Overheating w/AC on.

MARTYZ1

MEMBER
1999 TOYOTA PICKUP
4 CYL
2WD
MANUAL
114,000 MILES

I noticed once this season my temperature gauge going above what it's normal was while driving w/one passenger using the a/c. Immediately I changed the thermostat, the water pump and the fan clutch using new parts.
The temperature issue has not changed. Do you think maybe the radiator cap needs changing? It appears the fan clutch is working as it is impossible to stop it while hot. Maybe I never noticed the temp increase during the summer.I have a scangauge hooked up to the OBD II port which shows the temp going up to 216 degrees. Well the stock gauge rises to a point I have never seen before.

2 Replies

BUZZSAW

MECHANIC
1,198 POSTS

As a toyota gets up there in milage they do this, its normal, I have seen many mechanics try to fix it by replacing everything, and it still does the same thing. My 91 does it, driving to fast on the highway for long periods of time ( 60-70 mph ) and it will overheat and trans light comes on

a couple things you can do is clean out between the radiator and condenser, leaves and debris get in there, add a fan to the front, put a trans cooler on it. Reduce the heat as much as possiable