Service & repair
E36 & E46 Cooling System Overhaul
Radiator, expansion tank, water pump, thermostat and hoses for the E36 and E46 — the plastic cooling parts these cars are known to crack.
The E36 and E46 cooling systems lean on plastic: the radiator end tanks, the expansion tank, hose flanges and on many engines the water pump impeller and the thermostat housing. With age the plastic turns brittle and something lets go — often with little warning, and an inline six that overheats can warp its head.
An overhaul replaces the ageing parts together rather than one at a time as they fail. We go through yours, put what it needs on the estimate, and you choose what to do now.
Signs it needs doing
- Coolant on the ground or a sweet smell after driving
- The temperature needle moves above the middle
- The low-coolant light comes on, or you keep topping it up
- White crust or cracks on the radiator necks or the expansion tank
What the job covers
- Pressure test of the system
- Radiator, expansion tank and cap
- Water pump and thermostat
- Upper and lower hoses and the plastic fittings
- Coolant flushed and refilled, air bled out
- Fan clutch or auxiliary fan checked
What it costs
Every car is different at this age, so we price it once we have seen yours. Yes. You get a written estimate by email with a private link, and you approve it job by job — or decline what you don’t want. We won’t go over the estimate you approved by more than Colorado allows (10% or 25 dollars, whichever is less) without asking you first.
Questions
Can you use a used part from your own shelf?
Yes, when we have one that fits your car and you agree to it. We sell used E36 and E46 parts on this site; a used part goes on the estimate marked as used, with its condition, before you approve anything.
Should I keep driving if it is overheating?
No. Pull over and switch off. Driving an overheating inline six risks the cylinder head; it is cheaper to have it brought in.
Where to find us
Where to bring it
Book ahead so the car has a bay and the right person when it arrives. We get back to you to agree a time.
Book an appointment3 Series Parts Service
The service shop
More of what we do
Scheduled maintenance (Inspection I / II)BMW’s Inspection I and Inspection II maintenance for the E36 and E46 — fluids, filters, plugs, brakes and a full look-over, on our estimate first.
Oil serviceOil and filter change for the BMW E36 and E46 with the right oil for your engine, plus a quick look underneath while it is on the lift.
VANOS repairDiagnosis and repair of the VANOS variable valve timing on E36 and E46 sixes — seals, solenoids and the M3’s high-pressure VANOS.
E46 rear subframe reinforcementInspection and repair of the E46’s rear subframe mounts — the known floor-cracking problem — with reinforcement plates welded in.
Book an appointment
Bring your E36 or E46 in
Nothing is booked or charged until we have talked, and any price comes as a written estimate you approve first.
Body damage, paint or rust? See our body shop. Parts for your own work: shop used E36 and E46 parts. Both shops.
Independent repair shop; not affiliated with or endorsed by BMW AG or BMW of North America. BMW is a registered trademark of BMW AG.